Multiaxial Fatigue Crack Orientation and Early Growth Investigation Considering the Nonproportional Loading

被引：0
|
作者：
W. Song
X. Liu
F. Berto
机构：
[1] Harbin Institute of Technology,State Key Laboratory of Advanced Welding and Joining
[2] Norwegian University of Science and Technology,Department of Engineering Design and Materials
来源：
Physical Mesomechanics | 2018年 / 21卷
关键词：
multiaxial fatigue; cracking orientation; nonproportional loading; critical plane; polar representation;
D O I：
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中图分类号：
学科分类号：
摘要：
The paper presents a comprehensive investigation of fatigue cracking behaviors under various nonproportional multiaxial cycle loading paths based on the critical plane approach. The maximum normal and shear stress/strain fields are presented to analyze the crack orientation and early growth directions in polar diagrams. The experimental observed crack paths and directions were compared with maximum strain loci of each angle to determine multiaxial fatigue failure mode. The results show that crack orientation and growth paths appear in the maximum shear and normal strain plane, respectively. Likelihood cracking regions of various loading paths are predicted according the determined failure mode. Besides, nonproportionality factor is introduced to characterize the degree of multiaxiality on these loading paths.
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页码：358 / 370
页数：12
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