单向拉伸界面裂纹的条形损伤－塑性区域模型

A STRIP DAMAGED-PLASTIC ZONE MODEL OF INTERFACE CRACK UNDER TENSION LOADING

摘要: 本文提出单向拉伸情况下两相介质界面裂纹的条形损伤－塑性区域模型。假设在塑性区端点的应力有界，且使弱相介质达到屈服，损伤区的尺寸和δ＝成正比的条件；可确定损伤区与塑性区的长度及其上的法向和切向接合力，ＣＴＯＤ值等。由此导出的裂尖应力场无ｒ￣（－１／２＋ｊｅ）的强奇异振荡，位移场无ｒ￣（１／２＋ｉｅ）的振荡项。

Abstract: A Strip damaged-plaistic zone model of bimaterial interface crack underuniaxial tension loading is proposed in this paper,which is an extension of Dugdale model.It is assumed that the stresses are finite and satisfy the Mises yield condition at the end ofplastic zone,the size of damage zone is proportional to an equivalent crack tip displacementδ=(CTOD)￣2+(CTSD)￣21/2.From these conditions the sizes of damage zone and plasticzone,the normal and tangential cohesive stresses,the CTOD and CTSD can be determin...