A honeycomb panel fatigue testing device and testing method

Abstract

The invention relates to a fatigue testing device of a honeycomb panel and a testing method and belongs to the technical filed of performance testing of materials. The fatigue testing device of the honeycomb panel is characterized in that an air pressure operated nut locking trapezoid cross-section clamping fixture is mounted on a lower base of a fatigue testing machine through a vertical testing bracket; a test sample to be clamped is vertically clamped by the air pressure operated nut locking trapezoid cross-section clamping fixture; an eccentric wheel vibrator is arranged at the bottom end of the test sample to be clamped; the eccentric wheel vibrator is sequentially connected with an eccentric wheel and an external frequency converter; on / off operation of the external frequency converter is controlled by a motor; the lower part of the test sample to be clamped is respectively connected with a capacity strain gage and an electric eddy current precision displacement sensor. According to the testing method, fatigue life test results corresponding to different stress values are obtained, so that a life-stress curve line is created and the fatigue testing of the honeycomb panel is completed; a honeycomb panel clamp holder of the fatigue testing device has a trapezoid cross section, so that the honeycomb is prevented from being damaged; the test sample is vertically placed, so that the test sample is uniformly stressed; the testing method is convenient and feasible, and the accuracy of testing is ensured.

Description

technical field [0001] The invention relates to a honeycomb panel fatigue testing device and a testing method, belonging to the technical field of material performance testing. Background technique [0002] In recent years, with the continuous development of my country's new energy, aviation, construction, transportation and machinery industries, the demand for high-performance composite materials at home and abroad is growing rapidly. Honeycomb panels have been widely used in wind power generation and aerospace industries due to their excellent properties such as small mass, high specific strength, and high rigidity. Composite products such as honeycomb panels will be affected by alternating loads under actual working conditions, resulting in fatigue damage. Practice has shown that the service life of this type of product is closely related to its ability to resist bending stress. If the product has a strong ability to resist bending stress, the product will not be easily ...

AI Technical Summary

Problems solved by technology

The invention application document whose publication number is CN103175667A "blade fatigue non-contact measurement closed-loop vibration test method" proposes resonance test, but all the above existing methods are only suitable for solid materials, not suitable for honeycomb plate materials with hollow structures, and for small tests In this way, the uneven force caused by gravity has a greater impact and is difficult to ignore

First of all, for the honeycomb panel material with a hollow structure, excessive pressure can easily cause damage to the clamping part. When testing the fatigue performance, the damaged part caused by the clamping will be destroyed first, and the actual performance cannot be accurately measured; secondly, The accuracy of the amplitude detection and the control of the clamping force and stress of the sample greatly affect the test results of the fatigue performance of the honeycomb panel

So far, there is no ideal test method for the fatigue performance of honeycomb panels, and there is no corresponding fixture. This defect hinders the development of new structural honeycomb panels in wind power generation and aerospace industries.

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