Mechanical test analysis and material properties research of test members with crack damage
Taking the ratio of crack length to component width as the relative crack length of the component,the effects of relative crack length on the residual ultimate strength,elongation after fracture and mechanical properties of test members with crack damage were studied.The results show that with the increase of relative crack length,the residual ultimate strength of test members with crack damage decreases approximately linearly,and the finite element analysis results of the residual ultimate strength of test members with crack damage can be approximately regarded as the yield strength of the material.When the relative crack length is small,the steel member with crack damage exhibits plastic performance,and the steel member undergoes plastic failure under load.When the relative crack length is large,the steel member with crack damage will change from plastic performance to brittle performance rapidly,and the plastic failure of steel member may not occur under load.When the relative crack length is large to a certain extent,the test members with crack damage exhibit brittle properties,and the test members undergo brittle failure under load.
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