Propagation of tensile planar cracks in highly heterogeneous media:A numerical study

摘要：

　　Effect of highly heterogeneous fracture properties on tensile penny-shape planar crack propagation governed by Irwins criterion is investigated numerically by taking into account the large crack front deformations induced by the high toughness contrasts.To compute the variations of stress intensity factor (SIF) along the crack front arising from its progressive deformation,perturbation approach based on Bueckner-Rice weight function theory is used iteratively.Effective fracture toughness is obtained from the local toughness map for a few examples.It is shown that when Irwins criterion is satisfied all along the crack front,the effective toughness is equal to the mean value of the local ones along the crack front.This value depends on the shape of the front,and so is different from the total mean value of the toughness in the plane.In the examples studied here,the weak toughness zones are favored by the crack front deformations,so that the effective toughness is lower than its spatial average.

关键词： Tensile planar crack Heterogeneous medium Effective failure properties Perturbation method Linear elastic fracture mechanics

作者: M. Vasoya V. Lazarus L. Ponson

作者单位: UPMC Univ Paris 6,Univ Paris-Sud,CNRS,UMR 7608,Lab FAST,Bat 502,Campus Univ,F-91405,Orsay,France;UPM UPMC Univ Paris 6,Univ Paris-Sud,CNRS,UMR 7608,Lab FAST,Bat 502,Campus Univ,F-91405,Orsay,France UPMC Univ Paris 6,CNRS,UMR 7190,Institut Jean Le Rond d’Alembert,Boite courrier 161-2,4 Place Jussie

会议类型: 国际会议

会议名称: 第13届国际断裂大会(ICF2013)

会议地点: 北京

会议语种:英文

页码: 1-7

在线出版日期: 2013-06-16（万方平台首次上网日期，不代表论文的发表时间）