一种考虑脆性断裂的三线性内聚力模型

A Trilinear Cohesive Model Considering Brittle Fracture

针对复合材料的分层现象,本文结合复合材料的脆性断裂失效模式,提出了一种新型三线性内聚力模型,并基于FORTRAN语言编写Abaqus用户子程序VUMAT进行模拟。为了检验此三线性内聚力模型的可靠性,使用有限元分析软件Abaqus/Explicit对双悬臂梁模型和端边切口模型进行了建模,并对分层损伤的扩展过程进行了分析。结果表明,与双线性内聚模型相比,考虑界面材料脆性断裂过程的三线性内聚力模型不仅计算速度提高了约10%,而且能够更准确地模拟复合材料的分层现象。本研究为热固性复合材料层合板的分层研究提供了一种新的模型。

Aiming at delamination of composites,a new trilinear cohesive model which is combined with brittle fracture failure model of composites is proposed in this paper, and the Abaqus user subroutine VUMAT is written in FORTRAN language to realize the simulation. In order to examine the reliability of this trilinear cohesive model, the finite element analysis software Abaqus/Explicit is used to model the Double Cantilever Beam(DCB) model and the ENF model,meanwhile, the extended process of delamination damage is analyzed. The results show that the trilinear cohesive model that considering brittle fracture process of interface materials not only the calculation speed is increased by about 10% compared with the bilinear cohesive model, but also can more accurately simulate the delamination phenomenon of composite materials. This study provides a new model for the study of delamination of thermoset composite laminates.