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Acta Metall Sin  1990, Vol. 26 Issue (1): 46-52    DOI:
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SHORT FATIGUE CRACK BEHAVIOUR IN ISO-STRESS SPECIMENS
HONG Youshi;LU Yonghua;ZHENG Zhemin C. M. Cheng Institute of Mechanics; Academia Sinica; Beijing Institute of Mechanics;Academia Sinica;Beijing 100080
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HONG Youshi;LU Yonghua;ZHENG Zhemin C. M. Cheng Institute of Mechanics; Academia Sinica; Beijing Institute of Mechanics;Academia Sinica;Beijing 100080. SHORT FATIGUE CRACK BEHAVIOUR IN ISO-STRESS SPECIMENS. Acta Metall Sin, 1990, 26(1): 46-52.

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Abstract  The fatigue tests were made on the specially designed specimens by avibration testing machine to investigate the initiation and propagation features ofshort fatigue cracks in a weld metal. The specimens were prepared of a kindof triangular shape in which the surface tensile stress is a constant. The resultsshow that the short fatigue cracks originate from the slip bands and initiate insidethe ferrite grains. The development of short fatigue cracks is marked by the grad-ual increase in crack density with fatigue cycles. The coalescence between shortcracks leads to crack propagation and the crack path is predominantly transgranular.
Key words:  iso-stress specimen      short fatigue crack      weld metal     
Received:  18 January 1990     
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1 Gouda V K, Staehle R W. Br Corros J, 1980; 15: 111--117
2 Timoshenko S,Gere J 著,胡人礼译.材料力学,北京:科学出版社,1978:226--232
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