DEVICE FOR TESTING MIXED-MODE FATIGUE CRACK GROWTH RATE

摘要

A device for testing mixed-mode fatigue crack growth rate comprises a plate-like specimen, and a first fixture mechanism for exerting stretch, shear and torsion actions on the specimen via a second fixture mechanism; the second fixture mechanism is used for clamping the specimen and enabling the specimen to generate a mixed-mode fatigue crack in cooperation with the first fixture mechanism; the device further comprises a fatigue crack measurement instrument for measuring and recording the length of mixed-mode fatigue crack generated on the specimen. With the help of a common tension-compression fatigue testing machine or a torsion fatigue testing machine, the device drives the first and second fixture mechanisms to exert stretch, shear and torsion actions on the specimen, thus, the requirements of those tests on mode I, mode II, mode III and mixed-mode fatigue crack growth rates can be fully satisfied, and a good foundation is laid for precisely predicting the fatigue life of critical mechanical parts and engineer components under complex working conditions.