Universal fixture for three- and four-point bending performance testing of a material

Abstract

The invention belongs to clamps for testing material mechanical properties, and relates to a three / four-point bending performance test general clamp for a material. The three / four-point bending performance test general clamp provided by the invention helps to improve the three / four-point bending performance test efficiency, and especially helps to substantially improve the four-point bending performance test efficiency. Under the prerequisite of satisfying domestic and foreign test standards, five technical measures are employed for improving the efficiency of test preparation work, and specifically the five technical measures comprise generalizing the clamp, displaying span in digital manner, arranging scale on a bearer and performing bidirectional centering. The general clamp provided by the invention is capable of finishing three / four-point bending performance tests, so that the clamp replacing time is saved. When the three-point bending performance test is carried out, only an appropriate pressure head needs installing after two pressure-head seats of the clamp are in contact.

Description

technical field [0001] The invention belongs to a jig for testing the mechanical properties of materials, and relates to a general jig for three-point and four-point bending performance testing of materials. Background technique [0002] The bending properties of composite materials can be used for quality control and specification, and possibly for design. Bending performance tests are required in the R&D, factory inspection and factory re-inspection of composite materials. According to different loading methods, they are divided into three-point bending and four-point bending. Different stress states in the samples may lead to differences in results. From the point of view of the state of stress, four-point bending is preferable. In the mechanical performance test of composite materials at home and abroad, both methods are widely used, but because the three-point bending is easier to carry out, it is more widely used. [0003] When testing bending performance, testers ne...

AI Technical Summary

Problems solved by technology

The existing bending test fixtures usually only test the performance of three-point bending or four-point bending, and are not universal. There are also the following problems: generally, the positions of each support (or indenter) need to be adjusted successively, even if the two supports can be adjusted at the same time. The position of the seat (or indenter) cannot realize variable speed adjustment; it is not easy to position when placing the sample; it cannot digitally display the span

Therefore, the test efficiency is lower

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