The Consistency Analysis of Ultrasonic Fatigue Test Results of Metallic Materials
Ultrasonic fatigue test technology is widely used for very high cycle fatigue(VHCF)testing of metallic materials.As ul-trasonic loading intensifies the heat generation and temperature rising of specimens,intermittent loading is adopted to strengthen the heat dissipation which will affect the consistency of test results.Meanwhile,when the fatigue cycle extends from high cycle to very high cycle,the testing results will be more sensitive to specimen shape,size,surface roughness and internal defect size.In this paper,consistency analyses of these factors are conducted directly through many ultrasonic fatigue tests.It is concluded that inter-mittent loading manner and specimen shape or size all have an impact on VHCF testing results.There is a competitive relation-ship between surface quality and internal defects.The effect of interior defect on VHCF can be effectively reflected through S-N curve.
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万方数据
