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Acta Metall Sin  1978, Vol. 14 Issue (3): 239-326    DOI:
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AN INVESTIGATION OF THE CRACK-TIP STRESS AND STRAIN
Deng Zhi-sheng Chen Chi (Chen Chih)(Beijing Institute of Iron and Steel Research)
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Deng Zhi-sheng Chen Chi (Chen Chih)(Beijing Institute of Iron and Steel Research). AN INVESTIGATION OF THE CRACK-TIP STRESS AND STRAIN. Acta Metall Sin, 1978, 14(3): 239-326.

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Abstract  With the aid of etching by Fry's reagent and microhardness measurements, the crack-tip stress and strain have been investigated. The results obtained may be summarized as follows:The crack-tip stress increases simultaneously with the angle of bend of the specimen in accord with the relationJ=G+[(β/3~(1/2)+1/2(σ_(YY))_A)]δ_p derived by us under the linear hardening law:■=β+γ■until the critical point is reached:J_c=G_c+(β/3~(1/2)+1/2σ_F)δ_(p,c) demonstrating that at the critical point(σ_(YY))_A=σ_F
Received:  18 March 1978     
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https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1978/V14/I3/239

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