根据有限元计算分析的弹塑性裂纹体在平面应力条件下的裂纹尖端应力应变场,采用滑移线浸蚀以及断裂力学的试验方法,研究了该条件下的起裂和稳态扩展现象。结果表明,在裂纹尖端存在着HRR近程场以及取决于试样几何类型的远程场。起裂由单参数J控制,而稳态扩展行为则受远程应变场影响,不能由单参数描述。
The crack tip stress-strain fields of the elastic-plastic cracked speci-mens have been analyzed using finite element calculations, the crack initiation andsteady propagation behaviours have also been investigated by means of slip linepattern etching technique and mechanical tests. The results showed that there areHRR near field and distant field in the crack tip region, the latter depends on thespecimen configuration. The crack initiation behaviour is controlled by the singleparameter J, in contrast, the crack steady propagation is affected by the distantstrain field and can not be described by single parameter only.
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