本工作应用Fry试剂及显微硬度法研究了裂纹顶端地区的应力、应变,结果证明:随着试样总体应变的增长(弯曲角的增加),裂纹顶端的应力也在增长,增长的规律遵循我们在线性硬化律■=β+γ■下所推导的关系: J=G+[(β/3~(1/2)+1/2(σ_(YY))_A)]δ_p直到临界点时 J_c=G_c+(β/3~(1/2)+1/2σ_F)δ_(p,c)证实在临界点(σ_(YY))_A=σ_F
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
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