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所属单位：航空学院

发表刊物：FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

关键字：crack initiation location critical plane multiaxial fatigue notched specimen

摘要：An approach based on the local stress response is proposed to locate the fatigue critical point for metallic blunt notched specimens under multiaxial fatigue loading. According to the stress analysis, both stress gradient and gradient of loading nonproportionality exist at notch root. The plane in the vicinity of the notch that passes through the fatigue critical point and experiences the maximum shear stress amplitude is defined as the critical plane for notch specimens (CPN). Furthermore, the Susmel's fatigue damage parameter is modified to assess fatigue life of notched components by combining CPN and the theory of critical distance (TCD). The multiaxial fatigue test of the thin-walled round tube specimens made of Ni-base alloy GH4169 is carried out to verify the above approaches. In addition, test data of two kinds of materials are collected. The results show that the maximum absolute error of the fatigue critical point is 9.6 degrees and the majority of the predicted life falls within the three-time scatter band.

ISSN号：8756-758X

是否译文：否

发表时间：2019-04-01

合写作者：Luo, Peng,Li, Piao

通讯作者：姚卫星