JPS5960242A - Plastic strain control apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention This invention is based on the tension/pressure #ii test with an interest rate of 1.
Nucleus (related to mounting to suppress the four sets of plastic strains j11).

, -+] ■, A'A'i'l becomes distorted when tensile and compressive loads are applied. In this case, 4A
'; rJl is the degree of plasticity? / The strain when it is made includes elastic strain and plastic strain. By the way, in order to investigate the characteristics of the profit 'A', -1 that depends on the glastic strain, the elastic strain rate is constant, for example, J: sea urchin is drawn into the AA phase Ill;,・immediate 1
Cargo tonnage may be added.

However, when a load is applied to the interest rate, not only the plastic strain but also the elastic strain changes, so simply adding a load causes the B; do not have.

For this reason, there are 4) 8 points to control the magnitude of the load applied to the J material, but this control is stopped at 4 iji and the plastic +'+
rr] Making the velocity constant is Young's modulus, I:
1 for the physical property 'α of 1. It is very M7f+ because it changes every moment.

In this invention, in view of the above, A′A
``The size of the load applied to the ADl can be precisely and easily controlled.
The goal is to be able to do 4+.

In order to achieve the above object, the present invention has been developed to calculate the apparent Young's modulus from the strain and stress while adding tension, pressure path load, and 1i' to the interest. (compliance) and calculate the elastic rod based on this Young's modulus.”
j:'L, determine the total strain waveform from the desired plastic strain and this elastic strain, and apply a load (tIjI) corresponding to this total strain waveform to control the amount of plastic strain.
ff has been created.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention will be specifically explained about an Example based on drawing.

FIG. 1 is a block circuit diagram of an embodiment of the invention. Stress measuring means (1) is based on the test piece (test piece) having one elastic region (G) and a plastic region (G) with the maximum tensile stress σmax as shown in the stress-strain diagram in Figure 2. After receiving a tensile load in the trench, when the load is removed and it is in the static load region 0, the stress Δσ of the paulownia slope in this static load region C) is determined to be 6 (11). The strain △ε of 4 sheets and 1 in the horizontal static load area 0 is measured. The apparent Young's modulus calculation means (3) calculates the apparent Young's modulus E(-J-σ /Δε), the sum: i; tl', and the result is sent to the elastic strain calculation means (4) as a Young's modulus calculation signal. Here, in the stress-strain diagram in Figure 1, the line representing the static load region (Q) has the same slope as the line representing the elastic region. Regarding the intersection position of the line and the strain line on the horizontal axis, the value of the maximum tensile stress radiation ax and the line that expresses the apparent Young's modulus E, Therefore, the elastic strain ε is calculated from the strain value at the intersection point 1 and the strain value on the horizontal axis at the maximum tensile stress C1max. be able to.

According to this calculation, the elastic strain calculation means (4) calculates the elastic strain ε1 from the signal about the maximum tensile stress I7max from the maximum tensile stress measurement means (5) and the calculation signal about the Young's modulus of the child support. It looks like this.

On the other hand, in this embodiment, as shown in the plastic strain one-time line of FIG. Therefore, the plastic strain waveform output means (6) sends a signal having the waveform shown in FIG. 3 to the total strain waveform determination means (7). Since the total strain waveform determining means (7) is a total strain of two elastic strain + plastic strain, the elastic strain signal from the elastic strain calculation means (4) and the plastic strain waveform from the plastic strain waveform output means (6) By the ja- issue,
A waveform as shown in the solid line in the total distortion one-time diagram in FIG.
8).

The test piece strain control means 1 (8) applies a load to the test piece based on the input total strain signal.

Therefore, a tensile/compression 1 load that changes according to the waveform (solid line) in Figure 4 is applied to 41, and the plastic 1 raw strain is Sterilization changes occur in response to waveform changes as shown by the solid line in FIG. 3 and the broken line in FIG. 4.

FIG. 5 is a block diagram when FIG. 1 is applied to a (micro)computer, and FIG. 6 is its operation; a program flow 1-1 of the situation.

In Fig. 5, a testing machine (10 includes a load cell as a stress measuring means and a strain measuring means as a
1 illumination and a servo pulp as part of the specimen load control means. The control device f1t (II) is equipped with an amplifier for amplifying signals related to stress and strain from the load cell and strain measurement) 1g, and a control unit that applies a load control signal to the servo pulp. Side part 1
The output signal from the amplifier of the device (11) is passed through the interface circuit (121) to the apparent Young's modulus calculation means (3).
), etc. (7) A control designation signal from the microcomputer (13) is applied to the control device (11) via the interface circuit (12), and this control Equipment (I
f) is sent from the control unit to the servo pulp of testing machine 00. The operation of such a configuration will be explained with reference to FIG. First, the microcomputer (13) determines whether or not it is the elastic strain measurement cycle [step (n)].
]. If it is not the elastic strain measurement period (No), perform the test with plastic strain control [step (n+, )], and if the opposite (YES), perform the test with total strain control [step (n3)], by tensioning and compressing the material. conduct.

When controlling the total strain, the apparent Young's modulus (compliance) in the static load region is calculated from the lP strain *l'4'l
'-Do (step (+14)). This calculation is for test machine 0
This is carried out by a microcomputer (13) which receives signals regarding stress and strain from a load cell and a strain measuring device via a control device (11) and an interface (1).

After this calculation, the output waveform of the total strain [solid line in Fig. 4] for changing the plastic strain in the waveform shown in Fig. 3 is calculated using a microcomputer. 1:→
11 [step (n5) thus"2;
Self-discipline"!':'Nibaruzuotii 1, Jino)・Microcomputer (l:l) Kara.

The interface (12) is applied to the servo valve of the test system via the control unit of the control device (+++).

The servo valve applies a load to the monthly interest rate in response to the waveform adjustment shown by the solid line in FIG. In this way, the I) and V2 distortions in Months 1 and 1 will change at a constant speed as shown in FIG.

In addition, in the above-mentioned embodiment, the tensile load is jjs
As explained above, the same applies when applying compressive load and usage.
Applicable to 2. In addition, in the above-described embodiment, if it is not possible to perform a plastic strain control meter as shown in FIG. 3 due to the performance of the testing machine, the following may be used: It is also possible to control only the total distortion.

As described above-1, according to the present invention, the distortion and displacement force of the suspension 1 in the static load region after applying a compressive load 1) to the plastic region are ] 1 [Find the Young's modulus of the equation, calculate the elastic strain based on this Young's modulus,
From this calculated value, for example, the total strain waveform in which the plastic strain changes at a constant speed is determined, and a load is applied accordingly, so that the desired result can be obtained! II/l sex J3 is 1Fj
Load 11 accurately and easily so that the load 71'l is
For example, when limiting the parameter to plastic strain, it is easy to control this plastic strain. can.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a stress-strain diagram, Fig. 3 is a plastic strain versus time diagram, Fig. 4 is a total strain versus time diagram, and Fig. 5 is a time diagram of total strain. FIG. 6 is a block configuration diagram when the above embodiment is also applied to a microcomputer, and FIG. 6 is a program flowchart 1- for explaining its operation. (1)... Stress measuring means, (2)... Strain measuring means,
(3) Apparent Young's modulus calculation means, (4) Elastic strain meter 11 means, (5) Maximum tensile/compressive stress measurement means, (6) Plastic strain waveform output means , (7)...
Total strain waveform determining means, (8)... 11 people involved in test piece strain control means Shimadzu Corporation Representative Kazuhide Okada 20

Claims (1)

[Claims] (1) A stress measuring means and a strain measuring means for measuring the strain and stress of the material in the I: after applying a tensile/compressive load to the H material in the plastic 171 region in the '1.ru' region and the strain measuring means, respectively. And, 1) Young's quick estimate of 1; 1 kon by each measurement from il + ib both sides.
(Calculate the elasticity □r': based on 11 means and Young's t, ;;+l↓: 1-stage Heng modulus J1 bu number)]
Elastic strain ii'l' :G? : means and a plastic strain wave 1 that outputs a signal responsive to a preset plastic strain waveform.
[a Output means, elastic strain calculation means, and plastic strain waveform output, /J
The first order distortion waveform is determined by the output from Ding stage and 7.
I) ν1 distortion control device consisting of a total distortion waveform output means that outputs No. 13 corresponding to kl to the f waveform; 110