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Various crack tip constraints and their effect on ductile crack growth

机译：各种裂纹尖端约束及其对延性裂纹扩展的影响

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It is now well understood that the transferability of fracture toughness cannot be realizedwithout the consideration of crack tip constraints.For a 2D interface crack in an inhomogeneousmaterial system such as a weldment,in addition to specimen geometry and loading/boundaryconditions,material property mismatch,welding residual stress as well as pre-strain history willinduce crack tip constraints.This talk begins with a short review of the J–Q–M formulationdeveloped by the authors for describing the geometry and material mismatch induced crack tipconstraints,and will further focus on the recently proposed J–Q–R and J–Q–P frameworks forcharacterization of welding residual stress and pre-strain history induced crack tip constraints.A further systematic study has been carried out to investigate the effect of crack tip constraintsinduced by welding residual stress and pre-strain history on ductile crack growth.
机译：众所周知，如果不考虑裂纹尖端的约束，就无法实现断裂韧性的传递。对于非均质材料系统（如焊接件）中的二维界面裂纹，除了试样几何形状和载荷/边界条件，材料特性不匹配，焊接外残余应力以及应变前的历史将引起裂纹尖端约束。本演讲首先简要回顾了作者开发的J–Q–M公式，该公式描述了几何形状和材料不匹配引起的裂纹尖端约束，并将进一步关注最近的研究。拟议的J–Q–R和J–Q–P框架用于表征焊接残余应力和预应变历史引起的裂纹尖端约束。还进行了进一步的系统研究，以研究焊接残余应力和预应力引起的裂纹尖端约束的影响。韧性裂纹扩展的应变历史。

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