Computational Method for Crack Layer Model
Crack layer (CL) model is applied for modeling of brittle fracture of engineering thermoplastics.It specifically used in polyethylene structures,where a process zone (PZ) formed in front of crack is a narrow wage-type layer consisting of drawn fibers and membranes.To model CL requires an evaluation of stress intensity factors (SIF) and crack opening displacements (COD) within the crack and PZ domains.This paper is aimed to construct SIF and COD formulas for three specific geometries: a semi-infinite crack in an infinite solid; a single-edge notched specimen,standard Pennsylvania notch test (PENT,ASTM F 1473) and a new stiff constant-K (SCK) specimen.The approximate SIF and COD formulas are expressed as superposition of two elastic solutions one due to remote load and another associated with closing forces.The paper presents the computational technique in details.The approximate expressions of SIF and COD are used to present the method of computation the shape and the size of PZ,as well as the crack and PZ driving forces.The CL parameters then are used in simulation of CL growth and prediction of the lifetime of engineering structures made of thermoplastics.
Crack layer model slow crack growth process zone Greens function
Haiying Zhang Alexander Chudnovsky
Department of Civil and Materials Engineering,University of Illinois at Chicago,60607,USA
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）