SHORT FATIGUE CRACK BEHAVIOUR IN ISO-STRESS SPECIMENS

Abstract

Abstract: 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.

Key words: iso—stress specimen, short fatigue crack, weld metal

HOGN Youshi LU Yonghua ZHENG Zhemin Institute of Mechanics,Academia Sinica,Beijing,China Institute of Mechanics,Academia Sinica,Beijing 100080,China. SHORT FATIGUE CRACK BEHAVIOUR IN ISO-STRESS SPECIMENS[J]. Acta Metallurgica Sinica (English Letters), 1990, 3(4): 276-281.

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SHORT FATIGUE CRACK BEHAVIOUR IN ISO-STRESS SPECIMENS

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