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Mechanics of Composite Materials

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01-11-2016

Revisiting the Numerical Convergence of Cohesive-Zone Models in Simulating the Delamination of Composite Adhesive Joints by Using the Finite-Element Analysis

Authors: P. F. Liu, Z. P. Gu, Z. H. Hu

Published in: Mechanics of Composite Materials | Issue 5/2016

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Abstract

Delamination is the dominating failure mechanism in composite adhesive joints. A deep insight into the delamination failure mechanism requires advanced numerical methods. Currently, cohesive-zone models (CZMs), in combination with the finite-element analysis (FEA), have become powerful tools for modeling the initiation and growth of delaminations in composites. However, ensuring the numerical convergence in the CZMs used for a delamination analysis of three-dimensional (3D) composite structures is always a challenging issue due to the “snap-back” instability in the nonlinear implicit FEA, which arises mainly from the cohesive softening behavior. Based on the midplane interpolation technique, first numerical techniques for implementing 3D bilinear and exponential CZMs by using ABAQUS-UEL (user element subroutine) are developed in this paper. In particular, a viscous regularization by introducing the damping effect into the stiffness equation is used to improve the convergence. Two examples, a single-lap composite joint and a composite skin/stiffener panel under tension, demonstrate the numerical technique developed. Then, the effect of cohesion parameters on the numerical convergence based on the viscous regularization is studied.

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Title: Revisiting the Numerical Convergence of Cohesive-Zone Models in Simulating the Delamination of Composite Adhesive Joints by Using the Finite-Element Analysis
Authors: P. F. Liu
Z. P. Gu
Z. H. Hu
Publication date: 01-11-2016
Publisher: Springer US
Published in: Mechanics of Composite Materials / Issue 5/2016
Print ISSN: 0191-5665
Electronic ISSN: 1573-8922
DOI: https://doi.org/10.1007/s11029-016-9614-z

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