Testing system used for three-dimensional structure internal crack propagation experiment

Abstract

The invention provides a testing system used for a three-dimensional structure internal crack propagation experiment. The test system comprises a fatigue testing machine (3), a clamp (2), first DIC equipment (4) and second DIC equipment (5), and is characterized in that the fatigue testing machine (3) is used for fatigue loading; a double cantilever beam sample (1) serves as a sample for detectingcracks; the clamp (2) is used for connecting and fixing the double cantilever beam sample (1) and the fatigue testing machine (3); a first lens (401) of the first DIC equipment (4), a second lens (402) of the first DIC equipment (4), a first lens (501) of the second DIC equipment (5) and a second lens (502) of the second DIC equipment (5) align to the upper surface and the lower surface of the double cantilever beam sample (1) respectively, and are used for observing the coordinate change of each point on the upper surface and the lower surface of the double cantilever beam sample (1). According to the testing system, the testing process can be closer to an actual loading process, so that detected crack propagation actions are closer to the actual situation, and the system is of preferable guiding significance.

Description

technical field [0001] The invention belongs to the field of material performance detection methods, and specifically refers to a test system for internal crack growth tests of three-dimensional structures. Background technique [0002] In recent years, fatigue failures of machine parts have occurred frequently. According to relevant statistics, in engineering related to aerospace engineering, 60%-80% of damage is caused by fatigue damage of materials, and in engineering related to auto parts, about 85% of parts are damaged due to fatigue damage caused. This forces people to strengthen further research on fatigue damage, and the detection of fatigue cracks is particularly important. [0003] There are many ways to detect fatigue cracks. At first, due to the limitation of equipment and technology, people had to visually observe whether there are cracks on the surface of the workpiece. The fatigue test and surface observation are carried out separately. Remove it from the t...

AI Technical Summary

Problems solved by technology

However, most of them are suitable for detecting the crack growth behavior on the surface, and it is difficult to achieve more accurate detection of the internal crack growth behavior, and these methods have certain disadvantages, such as cumbersome operation, impact on human health, and environmental conditions. higher

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