双裂纹间弹塑性干涉效应的工程估算

Engineering Estimation of Elasto Plastic Interaction Effect Between Double Cracks

用二维弹塑性有限元方法，分析了平面应力下不等大双裂纹及平面应变下等大双裂纹受均匀拉伸时，模型裂纹间干涉效应的变化规律。认为当两裂纹尺寸差别不大时，文献〔６〕推荐的双裂纹间干涉效应计算式误差不大，但当其尺寸差别大时计算值过于保守。通过进一步研究。

Using a 2D elasto plastic finite element menthod,the change laws of E P interaction effect between double unequally sized cracks in plane stress state and between double equally sized cracks in plane strain state under uniform tension load are analyzed.It is considered that calculation equation for interaction effect between double cracks recommend by literature 6 is rather suitable to assessment when the size difference between two cracks is not too large,otherwise,the calculation value is too conservation.A new equation suitable for various condition is recommened.