INVESTIGATION ON LCF CRACK GROWTH RATE WITH CONTROLLING DEFLECTION AT HIGH TEMPERATURE
by WANG Shuanzhu; CHI Shuyao (Xi'an Aeroengine Factory); GENG Gangqiang (Xi'an Highway Institute) (Manuscript received 3 October; 1982; revised manuscript 5 August; 1983)
Cite this article:
by WANG Shuanzhu; CHI Shuyao (Xi'an Aeroengine Factory); GENG Gangqiang (Xi'an Highway Institute) (Manuscript received 3 October; 1982; revised manuscript 5 August; 1983). INVESTIGATION ON LCF CRACK GROWTH RATE WITH CONTROLLING DEFLECTION AT HIGH TEMPERATURE. Acta Metall Sin, 1984, 20(2): 83-210.
Abstract The low cyclic fatigue (LCF) crack growth rate was measured by means of controlling deflection on a superalloy at 600℃ in open air. The parameter of elastic-plastic fracture mechanics, J-integral was chosen as controlling variable and the relation dα/dN=1.26×10~(-4)(△J)~(1.96) was obtained. It was pointed that how J-integral (△J_t, △J_e, △J_p) varied versus deflection δ within gage length in cyclic loading. The suitableness and limitation were discussed on stress intensity factor △K as controlling variable of a crack growth. Fracture analysis showed that accumulative damage under creep/fatigue interaction made the fracture morphology changed from transgranular striation to intergranular mechanism which characterizes creep fracture.
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