A Study on the Characterization of Crack Tip Constraint Effect from Double Cracks
To gain a deeper understanding of the constraint effect from double crack tips and accurate-ly characterize it,this study focuses on non-collinear parallel double cracks in a homogeneous plate.It ex-amines the stress and strain fields associated with these double cracks,employing the ABAQUS finite ele-ment analysis software.Particular attention is paid to their behaviors at various horizontal distances(s)and vertical distances(h).Additionally,by leveraging the unified constraint parameter Ap,the constraints of double crack tips are compared with those of coalesced single crack tips.The findings reveal significant differences in the distributions and magnitudes of stress and strain at double crack tips compared to coa-lesced single crack counterparts.The conventional method of calculating the constraints from double cracks based on the stress or strain field at a crack tip,as done for single cracks,would lead to inaccurate results.Comparison of Atotal,Ainside,and Aoutside with Asingle shows that considering both inside and outside crack tip strain fields aligns the variation trend of Atotal more closely with Asingle,with a remarkably narrow fluctua-tion.The constraint magnitude for coalesced single cracks ranges from 0.10 to 0.30 of the total strain field(Atotal).This approach demonstrates a degree of universality,unaffected by whether the double cracks coa-lesce or not.It can be directly applied to quantify the constraints imposed by double cracks,regardless of their coalescing status.This study offers valuable insights into the constraint effect of double crack tips and presents a novel method for characterizing the constraints associated with double cracks.In summary,this novel approach offers a more comprehensive and accurate understanding of the complex constraints from double cracks,providing scientific support for evaluating structural integrity with double and multi-ple cracks.
万方数据
维普
