JPH035885Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a material testing machine.
In particular, it is a testing machine suitable for testing materials related to chemical resistance of polymeric materials, etc., and is related to a strut constant temperature device that maintains the strut supporting the test load at a constant temperature.

As is well known, material testing related to chemical resistance of polymeric materials and the like is known as stress relaxation tensile testing. This stress relaxation tensile test is a test in which an initial strain is applied to the test piece in advance, and when the amount of strain increases as the test piece deteriorates, the tensile force is loosened to equalize the initial strain. refers to the law. Conventionally, in this type of tensile test, since the test generally lasts a long time, the support in the testing machine expands and contracts due to changes in the temperature of the outside air, etc., and as a result, the load applied to the test piece changes. However, it had the disadvantage of causing measurement errors. Conventionally, in order to solve this drawback, the entire testing machine is installed in a constant temperature room to maintain constant temperature conditions, and then a tensile test is performed on the test piece. However, these tests include chemical resistance tests and
There is a condition that the test piece must be surrounded by the target chemical atmosphere, so if the entire test machine is installed in a constant temperature room,
Although the temperature of the support column was maintained at the desired temperature, there was a problem in that various parts of the test machine were exposed to the chemical atmosphere and were damaged.

The purpose of this invention is to provide a constant temperature support device for a tensile tester, which has a simple structure and is suitable for overcoming the drawbacks or difficulties found in the conventional polymer material testing described above.

In order to achieve the above-mentioned purpose, this invention specifically includes a pair of supports provided on the aircraft body,
A test load loading arm and a test load support arm installed parallel to each other between the pair of pillars;
a pair of gripping means each mechanically connected to the load arm and the support arm and gripping both ends of the test piece; applying a test load to the test piece via the load arm; A tensile tester in which a given test load is detected by a load cell provided on the support arm side, and a support in a tensile tester in which the support is maintained at a constant temperature by a constant temperature means that is adjusted and set in advance. It is a constant temperature maintenance device.

Hereinafter, the strut constant temperature maintenance device for the tensile testing machine according to this invention will be explained in detail based on a specific embodiment shown in the drawings.

In the embodiment shown in the figure, the test machine 1 has a fuselage 2
It has a pair of support columns 3, 3 provided above, and a test load loading arm 4 and a test load support arm 5, which are installed parallel to each other between the pair of support columns 3, 3. The test piece H has a lower gripping means 6 mechanically connected to said load arm 4 and said support arm 5.
upper gripping means 7 mechanically connected to the
Both ends Ha and Hb are grasped. The upper holding means 7 is normally connected to the support arm 5 via an upper pull rod 8, a universal joint 9 and a load cell 10. On the other hand, the lower gripping means 6 is connected to the test load loading arm 4 via the lower pull rod 11 and the load loading operation mechanism 12.
is connected to. According to the test machine with the above configuration,
By operating the load application mechanism 12, the lower pull rod 11 is pulled downward and a test load is applied to the test piece H.
This test load is detected by the load cell 10. In this invention, a small thermostatic chamber 13 suitable for the desired test purpose is installed around the test piece, that is, in an area including a portion of the upper pull rod 8 and lower pull rod 11. On the other hand, according to this invention, constant temperature means 14, 14 are formed on the pair of pillars 3, 3 to keep the pillars at a constant temperature. The constant temperature means 14, 14 are constantly maintained at a constant temperature by a temperature control source that can be adjusted to a desired temperature (a temperature higher than the outside air, for example 50° C.). Specific examples of the constant temperature means 14, 14 are shown in FIGS. 2 and 3. The one shown in FIG. 2 is composed of a ribbon-shaped heater 14A. The ribbon heater 14A is connected to a power source via a temperature controller 15 as a temperature control source. The temperature controller 15 includes a sensor 1 such as a bimetal switch.
6. Rather than winding the ribbon-shaped heater 14A with its winding pitch narrowed,
For example, it is more effective to wind the wires at intervals of about 2 to 3 mm. The one shown in FIG. 3A is composed of a ribbon-shaped heater 14B having a self-temperature control function that is already commercially available. This ribbon-shaped heater 14B with a self-temperature control function has a core-shaped heater element made of a mixture of special graphite carbon and a special semiconducting material between two parallel conductive wires, and is insulated around it. It has a construction made of wood and can be used by directly connecting to a power source. This ribbon-shaped heater 14B having a self-temperature control function is also wound around the pillar at intervals of several mm, as in the above-described embodiment. In the embodiments shown in FIGS. 3B and 3C, the struts are constituted by hollow struts 23, 33, and in the embodiment shown in FIG. 3B, a rod-shaped heater 14C is disposed inside the hollow struts 23. It's becoming like that. On the other hand, in the one shown in FIG. 3C, the hollow support 33 is provided with a fluid inlet 34 and a fluid outlet 35, and flow path pipes 36 and 37 are connected to each,
Temperature-controlled air, water, oil, etc. are circulated through them.
In any of the embodiments described above, a heat insulating material may be used in addition to the constant temperature means provided for the pillar.

According to the strut constant temperature maintenance mechanism in the tensile testing machine of this invention, which has the above configuration, it is constructed by simply applying a heater mechanism to the strut part in contrast to the conventional test equipment, and eliminates the need for a constant temperature room. It can be said that it is extremely advantageous economically, including equipment costs.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an outline of a tensile testing machine to which this invention is applied, Fig. 2 is a front view showing a specific example of the testing machine in which a constant temperature heater is provided on its support, and Fig. 3A. , B and C are partially cutaway views of the support pillars showing other specific examples of the constant temperature means. 1... Test machine, 2... Airframe, 3, 23, 33...
...Strut, 4...Test load bearing arm, 5...Test load supporting arm, 10...Load cell, 12...
Load application mechanism, 13... Test piece section constant temperature chamber, 1
4... Constant temperature means, 14A... Ribbon heater, 1
4B... Self-control type heater, 14C... Rod heater, 15... Temperature controller, 16... Sensor, H... Test piece.

Claims (1)

[Scope of utility model registration request] A pair of struts provided on the aircraft body, a test load loading arm and a test load support arm installed parallel to each other between the pair of struts, and mechanically connected to the load arm and the support arm respectively, A test load is applied to the test piece through the load arm, and the test load applied to the test piece is detected by a load cell provided on the support arm side. In the tensile testing machine configured as follows, the support column is
A support constant temperature maintenance device for a tensile testing machine, characterized in that the temperature is maintained at a constant temperature by a constant temperature means that is adjusted and set in advance.