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HOGN Youshi LU Yonghua ZHENG Zhemin Institute of Mechanics , Academia Sinica , Beijing , China Institute of Mechanics , Academia Sinica , Beijing 100080 , China
金属学报(英文版)
Fatigue tests were made on a vibration machine using specially designed specimens to investi- gate the initiation and propagation features of short fatigue cracks in a weld metal.The spec- imens were triangular in shape so that when loaded as a cantilever beam the surface tensile stress is constant.Test results show that short fatigue cracks mainly originate from slip bands within ferrite grains.The development of short fatigue cracks is marked by a gradual increase in crack density with fatigue cycles.Coalescence of short cracks leads to crack propagation and the crack path is predominantly transgranular.
关键词: iso—stress specimen , null , null
