会议专题

Constraint Effect in Fracture:Investigation of Cruciform Specimens using the J-A2 Method

  The structural integrity of cracked mechanical components can be assessed using the fracture toughness material property.The fracture toughness of a particular component is often dependent upon the component geometry as well as the nature of loading (e.g.uniaxial or biaxial loading).This dependence is interpreted as the constraint effect in fracture.Various methods have been developed to investigate the constraint effect,including the two parameter J-A2 method.The J-A2 method is a more accurate representation of the stress fields near the crack tip,as additional terms from the well-known HRR series solution are included.The current study applies the J-A2 method to fracture toughness data of cracked cruciform specimens subjected to uniaxial and biaxial stresses.The J-A2 results of the cruciform specimens are compared to those of other plane strain specimens described by ASTM standards,including three point bend and compact tension,to determine if loss of constraint exists.Finite element models of each specimen were analyzed to determine the A2 parameter used to quantify the level of constraint based on geometry and loading.The results reveal loss of constraint for shallow cracked specimens when compared to deep cracked specimens,and also that uniaxial loading results in loss of constraint when compared to biaxial loaded specimens.In summary,the J-A2 method appears to be a viable tool to predict failure including the consideration of the constraint effect.

fracture constraint biaxial cruciform

Larry Sharpe Yuh Chao

Department of Mechanical Engineering University of Tennessee,Knoxville,TN,USA College of Material Science and Engineering,Tianjin University,Tianjin,China

国际会议

第13届国际断裂大会(ICF2013)

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)