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用80-2球墨铸铁制造的汽车曲柄主轴,使用中发生了疲劳断裂.为了分析引起疲劳断裂的原因,进行了扭转疲劳和弯曲疲劳试验.本文介绍用扫描电镜对事故断口和试验断口的疲劳裂纹源点、扩展区和终断区断裂特征观察结果.
In order to analyze the cause of fatigue fracture, torsional fatigue and bending fatigue tests were carried out on automobile crankshaft made of 80-2 ductile iron.The fatigue crack of the accident fracture and the test fracture were described by scanning electron microscope Source, extension and fault zone fracture characteristics observed results.