A NUMERICAL ANALYSIS OF STRAIN GRADIENT MODEL FOR FRACTURE PREDICTION IN BRITTLE MATERIAL
In this work,a new model is developed to predict the fracture in brittle material from a geometrical weakness presenting an arbitrary stress concentration.The main idea is to combine the strain gradient elasticity with a cohesive model.The proposed model allows us to consider the different stress concentrations,even if they present some singularity.This model uses three material parameters which are σc,the ultimate stress,Gc,the critical energy release rate and l,the characteristic length as in most of the strain gradient theories.The main parameters introduced in the material law are the length parameters which represent material heterogeneities at a microscopic scale such as the distance between atoms,the average chain length,and the average size of grains etc.We also present the potential extension of the theory to interpret the size effect.The influence of the default size (hole,inclusions) on the fracture bchaviour is considered.
Thi Thanh Thao Pham Jia Li Radhi Abdelmoula
LPMTM,CNRS UPR 9001-Institut Galilée,Université Paris 13-99 Avenue Jean-Baptiste Clement,93430 Vilietaneuse
国际会议
第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)
安徽黄山
英文
322
2008-06-03（万方平台首次上网日期，不代表论文的发表时间）