JPH0342620B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] This invention relates to a method for testing viscoelastic materials, and in particular, detecting data on tests such as peeling and tearing of viscoelastic materials such as rubber. This paper relates to a viscoelastic material testing method that allows for appropriate analysis of forces, etc.

[Prior art and its problems]

Tear tests and peel tests of viscoelastic materials, such as rubber, and composite materials of this material and fiber cords or metal cords, are generally performed using a tensile tester or the like. The tearing force or peeling force of such a material is detected by applying a load as a tearing force or tearing force to a test piece, converting the load into an electrical signal using a load cell, etc., and converting this load into an electric signal. It is obtained by obtaining time characteristics, continuously recording them, and analyzing the data.

In other words, there are standards already established by JIS for these tests, and the test results are determined by analyzing records of changes in tearing force or peeling force. An example of the recorded results is as follows:
The waveform has a sawtooth-like complex shape as shown in Figures 1 and 2. For example, by reading the upper limit peak value (see symbol x) in Figure 1, ISO6133 requires that the median value obtained from each of these waveforms be used as the tear force. and ISOR36,
JISK6301 stipulates that the average value of the upper limit peak values be analyzed as the peeling force.

Conventionally, when performing tear tests and peel tests in accordance with these standards, the peak value (the value of the peak or valley of the detected waveform) is read manually, which has many errors and makes it impossible to analyze the test results properly. There is a drawback.

If proper analysis cannot be performed in this way, retesting may be required, but depending on the material, similar samples may not be obtained in many cases, which is a problem.

In order to solve this problem, a device has been proposed that automatically reads the peak using a processing device equipped with a microprocessor, etc. The contents of the changes vary depending on the material, and are often extremely complex, so that it is currently difficult to distinguish between noise and the peak of each waveform. Moreover, there are cases where the interval between peaks disappears, and it is difficult to determine where the original peak should be in such a field, and devices that automatically read peaks have the disadvantage of not being able to handle such situations. I have it.

[Object of the Invention] The present invention has been made in view of the drawbacks and problems of the prior art. The purpose of the present invention is to provide a viscoelastic material testing method that can accurately read the peak from the characteristic waveform even when there is noise and analyze the correct tearing force and peeling force.

[Key points of the invention]

A feature of the present invention to achieve such an objective is to measure time from the detected peak and suppress the peaks during this time as noise.
This method removes noise components, and uses a certain peak as a reference to detect the next peak after a certain time difference.The peaks between this time difference are not detected, and the viscosity is removed. When the load applied to the elastic material test piece is increasing and the value after a certain period of time is higher than the peak value, the next peak is detected, the peak value is held, and the upper peak value is and detect the original upper peak. Furthermore, if necessary, when the load applied to the test piece is decreasing and the value after a certain period of time is in a state of decreasing from the peak value, the next peak is detected and the peak value is held;
The lower limit peak value is determined and the original lower limit peak is detected.

However, its composition consists of peeling of viscoelastic material,
In tests such as tearing, the device is equipped with a detector and a processing device that detect the load applied to the viscoelastic material as peeling force or tearing force, and the processing device detects the peak of the load detected by the detector. A peak detecting means for detecting, a first holding means for holding a load value of the detected peak, a second holding means for holding a load value detected after a certain period of time after detecting the peak, and a first holding means for holding a load value detected after a certain period of time after detecting the peak. and determining means for determining whether or not the peak value held in the holding means is larger than the value held in the second holding means, and as a result of the judgment by the judging means, it is determined that the peak value is not larger. Sometimes, a similar judgment is made for the next detected peak, and when it is judged to be large, the peak value held in the first holding means is determined as the upper limit peak value for peeling force or tearing force, etc. Then, the detected data is analyzed.

By doing so, the noise component can be removed by time measurement using the detected peak as a reference, and the correct upper limit peak value can be analyzed.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

FIG. 3 is a block diagram mainly showing the functions of a viscoelastic material testing system for tear testing, peeling testing, etc. to which the present invention is applied.

In the figure, 10 is a viscoelastic material testing system, which includes a testing machine 2 in which a test piece 1 of a viscoelastic material such as rubber is set, an A/D converter 3, a processing device 4, a display 5, and It is equipped with a keyboard 6.

Here, the testing machine 2 is provided with a load cell 11 that detects the load value applied to the test piece 1 as an electrical signal, and sends the detection signal to the A/D converter 3. do. A/D converter 3
converts the detected load value into a digital signal and inputs it to the processing device 4.

The processing device 4 includes a mountain side/valley side peak detection means 21
and first holding means 22 (peak value holding means), time measuring means 23, current value holding means 24, large/small judgment means 25, peak value storage means 26, and calculation means 27 for peeling force etc. It receives the detected load value for the test piece 1 in the form of a digital signal and performs predetermined processing. Note that the current value holding means 24 and the time measuring means 23 constitute one specific example of the second holding means in the present invention.

On the other hand, the testing machine 2 includes a control panel 12 that controls the application of a load to the test piece 1, and a recorder 13 that records the load-time characteristics.

Now, the processing device 4 supplies the digital signal of the input load value to the peak side/valley side peak detection means 21, the first holding means 22, and the current value holding means 24.

The peak side/valley side peak detection means 21 is supplied from the A/D converter 3 in response to, for example, an activation signal in an initial state inputted from the keyboard 6 or a activation signal of a large/small determination means 25 to be described later. The signal of the load value is sampled at a constant cycle and compared with the previous sampling data to determine whether the sampled data is a peak on the mountain side or a peak on the valley side based on the increase/decrease state. Then, it is detected whether or not it is a peak, and the respective peak detection signals corresponding to the mountain side and the valley side are sent to the first holding means 22, and the time measuring means 23 is activated.

When the peak detection signal is on the mountain side, the first holding means 22 takes in the detection signal of the load value as the peak value on the mountain side and stores it. Furthermore, when the peak detection signal is on the valley side, the detection signal of the load value is taken in as the peak value on the valley side.

On the other hand, the time measuring means 23 receives the activation signal from the peak side/valley side peak detection signal 21, counts this for a predetermined time set in advance, and when the predetermined time has elapsed, the current value holding means 24
and sends a control signal to the large/small determining means 25.

The current value holding means 24 which received this control signal,
The input load value detection signal is captured and held.

Now, the large/small determination means 25 is the time measuring means 2.
3, the current value holding means 24
and the respective data are read from the first holding means 22 and compared in size. Here, when the data currently held in the first holding means 22 is the peak value on the mountain side, the large/small determining means 25
determines whether the peak value of the first holding means 22 is larger than the current value, and when it is larger, the value stored in the peak value holding means 22 is set as the upper limit peak value (maximum peak value). The data is transferred to a predetermined area of the peak value storage means 26 and stored therein.

On the other hand, when the data currently held in the first holding means 22 is a peak value on the valley side, the large/small determination means 25 determines whether the peak value of the first holding means 22 is smaller than the current value. control to transfer the value stored in the peak value holding means 22 as a lower limit peak value (minimum peak value) to a predetermined area of the peak value storage means 26 and store it when the value is determined to be small; do.

When this process is completed, the mountain side/valley side peak detection means 21 is activated to perform control to detect the next peak. As a result, each time an upper limit peak and a lower limit peak are detected, these peak values are sequentially stored in a predetermined area of the peak value storage means 26.

In this way, when the peak is on the mountain side, only the peak value determined to be larger than the current value is held as the upper limit peak value to be obtained, and when it is not determined to be larger, the mountain side/valley side peak detection means 21 is activated again. Then, the next peak value is held in the first holding means 22 and subjected to the same judgment. Also,
When it is on the valley side, only the peak value that is determined to be smaller than the current value is held as the lower limit peak value to be obtained, and when it is not determined to be smaller than the current value, the mountain side/valley side peak detection means 21 is restarted to detect the next peak. The value is held in the first holding means 22 and subjected to a similar determination.

As a result of the above, the upper limit peak value and lower limit peak value of the test piece 1 are sequentially stored in a predetermined area of the peak value storage means 26. This process ends when one or both of these upper limit peaks and lower limit peaks reaches a predetermined number, or when a predetermined key is input from the keyboard 6 to end the test.

Here, the peeling force calculation means 27 counts either the upper limit peak or the lower limit peak of the peak value storage means 26, or both. Then, when this count value reaches a predetermined value and the process is completed, a termination signal is generated.

Here, the peeling force calculation means 27 that generates this end signal or receives the processing end signal from the keyboard 6 calculates the upper limit peak value and lower limit peak value stored in the peak value storage means 26. Read out,
In the case of peeling force, for example, the numbers of the upper limit peak value and the lower limit peak value are counted, and the average value of the upper limit and the lower limit, and the average value thereof are calculated. Furthermore, in the case of tear force, the median value of the upper limit peak values is calculated.

These results are sent from the peeling force calculation means 27 to the display 5 and displayed thereon.

In addition, it is of course possible to detect only the peak on the mountain side, store its upper limit peak value, and calculate the median value according to the ISO method, JIS method, etc.; The valley side peak detection means 21 only needs to be able to detect the mountain side peaks. Further, the large/small determining means 25 only needs to determine large.

Next, an embodiment of the present invention in which processing is performed using a microcomputer as a processing device will be specifically described.

FIG. 4 is a block diagram of an example of a viscoelastic material testing system realized using a microcomputer, FIG. 5 is a detection waveform diagram of the load-time characteristic of the load cell 11, and FIG. It is a flowchart of the process of peak analysis of a computer.
In addition, in FIG. 4, the same symbols as in FIG.
Indicates the same thing.

30 shown in FIG. 4 is the main block of the viscoelastic material testing system, and 31 is a microcomputer, which includes an interface 32, a common bus 33, and an arithmetic processing unit 34 (microprocessor;
MPU) and memory 35.

Here, the signal detected by the load cell 11 is as shown at 36 in FIG.
This is input to the A/D converter 3, converted into a digital value, and input to the interface 32. Then, from the interface 32 to the common bus 3
3, the data is transferred to the arithmetic processing unit 34 and subjected to predetermined processing.

On the other hand, from the keyboard 6, at predetermined timing, a start signal, an analysis end signal, etc. for the peak analysis program shown in FIG. . On the other hand, the results of processing according to a predetermined program are sent from the arithmetic processing unit 34 to the interface 32 via the common bus 33, and transferred to the display 5 via the interface 32, where predetermined data is displayed. This is what is displayed.

Now, the peak analysis process of the arithmetic processing unit 34 will be explained according to FIGS. 4, 5, and 6. First, the peak analysis program in FIG. are respectively stored in the memory 35 as the program 35b.
It is assumed that the data is stored in a predetermined area of . When a predetermined function key on the keyboard 6 is input, this program 35a is activated and peak analysis processing is executed according to the following steps.

That is, the step shown in FIG. 6 is an initial setting step, in which variables P ₁ , P ₂ , i, M,
Clear N and V to “0”. Here, the variable P ₁ is
It sets the current load sampling data detected by the load cell 11, and the variable _P2 is
The previous sampling data is set. Further, the variable i indicates the storage address position of the upper limit peak value and the lower limit peak value on the memory 35, the variable M stores a flag indicating an increasing state, and the variable N stores a flag indicating a decreasing state. It is something to remember. On the other hand, the variable V stores a flag indicating the detection state on the valley side.

Each of these variables is set as one data storage area on the memory 35, and it goes without saying that registers may be used instead of these variables.

In the next step, the value of the variable _P1 is transferred to the variable _P2 , and in the step, detected data is taken in according to a predetermined sampling timing, and this is set in the variable _P1 in the step. Note that this sampling timing corresponds to the waveform 36 shown in FIG.
This is done in accordance with the timing indicated by reference numeral 37.

Then, in the next step, the variable P ₁ indicating the current load sampling data is compared with the variable P ₂ indicating the previous load sampling data, and P ₁ >
Make a P ₂ judgment.

If the result of this judgment is YES, it is considered to be in an increasing state, and the increase flag is set to “1” in the step.
is set to variable M. Then, in the step, it is determined whether the variable N indicating the decrease flag has been set first, based on whether N=1.

When it is in the increasing state shown in the region of FIG. 5, there is no decreasing state at the beginning, so the determination at the step is NO and the process returns to the step, which is what is called a circular loop process. Then, in the same way as above, in step, the value of variable P ₁ is transferred to variable P 2, and in step, the value of variable P 1 is transferred to variable P ₂ , and in accordance with the predetermined sampling timing, load cell 11 is
The load value of is taken in as detection data, and this is set to variable _P1 in step. And again,
In step, determine P ₁ > P ₂ . here,
Assuming that the sampling is beyond the first peak 38, the current sampled data P ₁ is decreased relative to the previous sampled data P ₂ . As a result, we move to step a and enter the judgment of P ₁ = P ₂ , and in the unlikely event that YES (P ₁ = P ₂
), the process returns to step 3, and the same process is performed, where the determination is made again and the result is NO.

If it is determined that the number is in a decreasing state, "1" is set in the variable N as a decreasing flag in step a. Then, in step a, it is determined whether a flag indicating an increasing state is set. Here, at peak 38, it changes from increase to decrease, so it becomes YES and the previous sampling data is
P ₂ is detected as a peak, and at peak a, the value of variable P ₂ (the peak value on the mountain side) is transferred and stored at a location MAXi indicated by address i in the area labeled MAX on the memory 35.

By the way, if the NO condition is reached in the determination at step a, this is the case as shown in the area of FIG. 5, where the condition is in a decreasing state from the beginning. Such a decreasing state is a case of peak detection on the valley side, and this peak detection on the valley side is detected by shifting from a decrease to an increase. Therefore, when the answer is NO at step a, the process moves to step b, where "1" is set in the variable V as the valley side flag, and the process returns to the step. and,
When the same circulation process as before is carried out and, for example, the peak on the valley side such as peak 40 shown in FIG.
YES, the previous sampling data P ₂ is detected as the lower limit peak, and similarly, the value of variable P ₂ (the peak on the valley side value)
Transfer and store.

In this way, the peaks on the mountain side and the peaks on the valley side are detected by the process from step to step and from step to step a. Therefore, the processing up to this point is one specific example of the mountain side/valley side peak detection means 21 shown in FIG. moreover,
The processes in step and step a are specific examples of the first holding means 22 (peak value holding means) and also serve as specific examples of the peak value storage means 2, respectively.

After detecting the peak in this way, the process moves to the step, the timer is set to _T1 , the time is measured in the step, and the process waits until the time is finished.
It enters a so-called time waiting loop. These steps are one specific example of the time measuring means shown in FIG. 3 above.

Then, in a step, the load value of the load cell 11 is taken in as detection data according to a predetermined sampling timing, and this is converted into a variable in a step.
Set to P ₁ . In the next step, it is determined whether the variable V is V=1 or not, and if it is NO, the process moves to the step and the previously detected peak value MAXi is set after a certain time _T1 set by the timer. It is determined whether the current sampling data P is larger than ₁ . As a result, if it is not large, the process moves to step a, resets the decrease flag N set at the time of peak detection to invalidate it (N=0), returns to step A, and performs similar processing. Then, in the step, the peak value MAXi is again set for a certain time T ₁ set by the timer.
It is determined whether the current sampling data _P1 is greater than the subsequent current sampling data P1. In the process of such circulation, when the upper limit peak 39 (see FIG. 5) is detected as a peak and the peak value is set to MAXi, the sampling data _P1 becomes smaller than this. As a result, the judgment in the step is YES, and in the step, i=i+1, this peak value is held as the upper limit peak value in MAXi, the address of the memory 35 is updated, and the next step is performed.
Prepare to hold the next upper limit peak value at MAXi ₊₁ and move on to step.

In the step, the information stored in the memory 35 is
It is determined whether the number of MAXi and/or MINi has reached a predetermined number, or whether the end key has not been input from the keyboard 6, and the end of the process is determined. Sometimes it moves to steps. Since the decreasing state has already been determined in the step, only the increasing state flag is reset (M=0) in this step, and the process returns to the step to start the process of detecting the next peak on the valley side.

Now, when the valley side detection process is started and a valley side peak is detected in the step, the peak value will be stored in the area MINI of the memory 35.

In this case, in the determination at step D, the variable V indicating the valley side flag is determined to be V=1,
The result is YES, and the process moves to step a.

In step a, it is determined whether the previously detected peak value of MINI is smaller than the current sampling data _P1 after a certain time _T1 set by the timer. As a result, if it is not small, the process moves to step, resets the increase flag M set at the time of peak detection to invalidate it, returns to step, performs similar processing, and returns to step a. Then, it is determined again whether the peak value MIni is smaller than the current sampling data _P1 after a certain time _T1 set by the timer. In the process of such circulation, when the lower limit peak 41 (see FIG. 5) is detected as a peak and the peak value is set to MIni, the sampling data _P1 becomes larger than this. the result,
If the judgment in step a is YES, in step a, i=i+1, the valley side flag "V" is reset (V=0), and this peak value is stored in the memory 35 while being held as the lower limit peak value in MINI. Update the address of MINi+1 to prepare to hold the next lower peak value at the next MINi ₊₁ , and then proceed to step a.
Move to.

At step a, it is determined whether the process has ended in the same way as in step a, and if the determination is NO, the process moves to step a. Since the increasing state has already been determined in step a, only the decreasing state flag is reset in step a, and the process returns to step A to begin the process of detecting the next mountain side peak.

Here, the process of setting the detection data to the variable _P1 of the step is one of the specific examples of the current value holding means in FIG. This is one example. In addition, the processing of step or step a and the areas MAX and MIN of the memory 35 are
This is one specific example of the peak value storage means 26 shown in the figure.

In this way, each upper peak and lower limit peak are detected and sequentially stored in the memory 35 from MAX ₁ to MAX _o
Store the upper peak value in , and sequentially start from MIN ₁ .
Store the lower limit peak value in MIN _o . however,
n is the number of peaks detected at each of the upper and lower limits until the end of the test.

As described above, analysis can be performed by sequentially detecting the upper limit value and lower limit value among the load values detected from the load cell 11, and holding the respective upper limit peak value and lower limit peak value corresponding to these. can.

By the way, in the above step, it is determined that P ₁ > P ₂ , and in step a, it is determined that P ₁ = P ₂ ,
We are determining whether the detected load value increases or decreases, but due to noise, the previous sampling data is
Only those that have increased or decreased by more than a certain percentage with respect to P ₂ may be considered as the original increase or decrease, and may be subject to each peak detection.

In such a case, the steps may be e.g.
Determine (P ₁ − P ₂ )/P ₂ > 0.05, and if NO,
At step a, −0.05≦(P ₁ −P ₂ )/P ₂ ≦
You can make a determination of 0.05 and return to the step when it is YES. By doing this, peak detection will be performed when there is an increase or decrease of 5% or more. As a result, noise can be sufficiently removed, making the analysis process more reliable.

Furthermore, when detecting peaks, each peak may be detected on the condition that a lower limit peak exists between the upper limit peaks, and that an upper limit peak exists between the lower limit peaks. .

In such a case, the peaks are detected alternately on the mountain side and the valley side, and when the peak is on the mountain side, the step returns from step to step when the YES condition of the step is set, and step a and step a are omitted, and the process returns to step A. All you have to do is move to step a.On the other hand, if you are on the valley side, move to step NO.
It is sufficient to return from step to step when the condition is met, omit steps, and move to step. Furthermore, even in such a case, it is possible to provide a step a and add a condition such that a peak is detected when the increase or decrease exceeds the predetermined value shown above in the judgment of step a. be.

Now, the fixed time set in the step
T ₁ is set empirically depending on the test content, but this setting time T ₁ may be made variable and set as appropriate. For the waveform shown in Figure 5, , it is preferable to set it to about 2/3 or 2/3+α of the average value of the intervals between a plurality of peaks. This means that the point at which the peak is detected is actually the next sampling point past the peak point;
Actual time measurement is done at this point, so if you set it to about 2/3 of the average value or 2/3 + α, even if valleys or peaks appear due to noise, it will still be 2/3 of the average value.
This is because at a sampling point after a time period of 2/3+α has elapsed, unless it is an upper limit or a lower limit value, it can almost certainly take a value that increases or decreases from the previous peak value. As a result, the noise between the peaks can be reliably suppressed during this period.

Now, when the determination process in step or step a is completed, the arithmetic processing unit 35 performs the following steps.
Next, the program 35b for calculating the peeling force and the like is activated from the memory 35, and processing for calculating the peeling force and the like is started.

Here, the upper limit peak value and lower limit peak value stored in the memory 35 are each counted by the arithmetic processing unit 34, and the numbers are stored.
At this time, the first m peak values and the last n peak values are excluded from the calculation process (where m and n are arbitrary integers).

Then, the peeling force and tearing force are calculated by the known peak point method, area method, JIS method, etc.

In addition, the information on the calculated peeling force and tearing force is
The data will be sent to the display 5 via the interface 32 and displayed, and further output to a printer if necessary.

By the way, the processing of the arithmetic processing device 34 in this case is one of the specific examples of the calculation means 27 for peeling force etc. shown in FIG. The present invention is not limited to the processing content of the processing unit and processing means.

Although the above has been described in detail, the processing shown in this embodiment is just one example, and the present invention is not limited to this. Peak detection is performed by program processing on the arithmetic processing device side in this way. Even if it doesn't depend on
Each peak point may be detected using a general peak detection circuit, and then A/D conversion may be performed, and the detected data may be processed on the arithmetic processing device side. In this case, the program processing for peak detection becomes unnecessary, and time is measured based on the detected peak. Note that time measurement in such a case may also be realized by hardware using a one-shot multi-channel system, and may be integrated with the peak detection circuit.

In addition, in the example, by sampling processing,
Peak detection is performed by importing the detected load data as detection data each time, but regardless of whether there is a peak value, all load data from the load cell is sampled first, and only the sampling process is performed independently. After performing the calculation and storing it in the memory, a peak detection process may be performed to extract the upper limit peak value and the lower limit peak value by arithmetic processing. When performing such processing, the time measurement processing for each step is performed by excluding a predetermined number of sampling data. However, this is essentially equivalent to suppressing data by time measurement. Therefore, such things are also included in the time measurement in this invention. Note that by performing sampling processing independently and collecting data, there is an advantage that processing can be performed even by a processor with a relatively slow processing speed.

Furthermore, only each peak and its peak value may be detected after time measurement, and the detected peak values may be compared later to extract the upper limit peak value or the lower limit peak value.

Incidentally, in the embodiment, both the upper limit peak value and the lower limit peak value are detected, but it goes without saying that only the upper limit peak value may be detected.

Further, in the examples, an example is given in which peak detection is performed in order to analyze peeling force or tearing force on a viscoelastic material, but the present invention is not limited to analysis processing in such cases. It goes without saying that this method can be applied to the analysis of noisy peak detection for viscoelastic materials, and can also be applied to so-called peeling force or tearing force.

〔Effect of the invention〕

As can be understood from the above explanation, in the present invention, the next peak is detected after a certain necessary time difference with respect to a certain peak, and the peaks between this time difference are detected. When the load applied to a viscoelastic material test piece tends to increase and the value after a certain period of time increases more than the peak value, the next peak is detected and the peak value is held. The upper limit peak value is determined to detect the original upper limit peak. Furthermore, when necessary, when the load applied to the test piece is decreasing, if the value after a certain period of time is in a state of decreasing from the peak value, the next peak is detected and the peak value is held, and its lower limit is By calculating the peak value, the original lower limit peak can be detected. Therefore, the noise component can be removed by time measurement based on the detected peak, and the correct upper or lower limit peak can be selected.

As a result, there is no need to manually read the peak value of the peel test or tear test result data for viscoelastic materials, and it is possible to obtain and analyze appropriate test results, with almost no need for retesting. It disappears. Furthermore, it is possible to clearly separate noise from the peaks of each waveform, and the influence of noise can be removed.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams of waveforms of load-time characteristics in conventional peeling tests and tear tests on test pieces of viscoelastic materials, respectively, and FIG.
A block diagram focusing on the functions of a viscoelastic material testing system such as a tear test or a peeling test to which this invention is applied, FIG. 4 is an embodiment in which the viscoelastic material testing system of this invention is realized using a microcomputer. FIG. 5 is a waveform diagram of the load-time characteristic detected by the load cell, and FIG. 6 is a flowchart of the peak value analysis process performed by the microcomputer. 1... Test piece, 2... Testing machine, 3... A/D converter,
4... Processing device, 5... Display, 6... Keyboard, 10... Viscoelastic material testing system, 11... Load cell, 21... Mountain side/valley side peak detection means, 22
...Peak value holding means, 23...Time measuring means, 24
...Current value holding means, 25...Large/small determination means, 26
...Peak value storage means, 27...Peeling force etc. calculation means.

Claims (1)

[Scope of Claims] 1. In a test for peeling, tearing, etc. of a viscoelastic material, a detector for detecting a load applied to the viscoelastic material as a peeling force or a tearing force, etc., and a processing device, The device includes a peak detecting means for detecting the peak of the load detected by the detector, a first holding means for holding the load value of the detected peak, and a peak detecting means for detecting the peak of the load detected by the detector, a first holding means for holding the load value of the detected peak, and a peak detecting means for detecting the peak of the load detected by the detector, and a first holding means for holding the load value of the detected peak, a second holding means for holding a value; and a second holding means for holding a value;
The peak value held in the holding means of the second
and determining means for determining whether or not the value is larger than the value held in the holding means, and when it is determined that the value is not larger as a result of the determination by the determining means, a similar determination is made for the next detected peak. is determined to be large, the peak value held in the first holding means is determined as the upper limit peak value for peeling force, tearing force, etc., and the detected data is analyzed. Test method for viscoelastic materials. 2. The determining means determines whether the peak value held in the first holding means is larger than or smaller than the value held in the second holding means; When determining whether the peak is large or not, if it is determined that the peak is not large as a result of the judgment, a similar judgment is made for the next detected peak, and when it is judged that the peak is large, the first retention If the peak value held by the means is determined as the upper limit peak value for peeling force or tearing force, etc., and the detected data is analyzed to determine whether or not this determination means is small, the As a result, when it is determined that the peak is not small, a similar determination is made for the next detected peak, and when it is determined that the peak is small, the peak value held by the first holding means is peeled off or tearing force is applied. The viscoelastic material testing method according to claim 1, characterized in that the detected data is analyzed by determining the lower limit peak value for . 3. The viscoelastic material testing method according to claim 1 or 2, wherein the processing device includes an arithmetic processing device and a memory.