Quasi-static and dynamic analysis of delamination growth using new interfacial decohesion elements

A. Elmarakbi, N. Hu, Hisao Fukunaga

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, a modified adaptive decohesion element is presented. The new elements are developed and implemented in LS-DYNA, as a user defined material subroutine (UMAT), to stabilize the finite element simulations of delamination propagation in composite laminates under transverse loads. In this model, a presoftening zone is proposed ahead of the existing softening zone. In this pre-softening zone, the initial stiffness and the interface strength are gradually decreased. The onset displacement corresponding to the onset damage is not changed in the proposed model. In addition, the critical energy release rate of the materials is kept constant. Moreover, the constitutive equation of the new decohesion model is developed to be depended on the opening velocity of the displacement jump. The traction based model includes a cohesive zone viscosity parameter (η ) to vary the degree of rate dependence and to adjust the maximum traction. The numerical simulation results of DCB in Mode-I is presented to illustrate the validity of the new model. It is shown that the proposed model brings stable simulations, overcome the numerical instability and can be widely used in quasi-static, dynamic and impact problems.

Original languageEnglish
Title of host publicationProceedings of the 6th International Conference on Engineering Computational Technology
Publication statusPublished - 2008 Dec 1
Event6th International Conference on Engineering Computational Technology, ECT 2008 - Athens, Greece
Duration: 2008 Sep 22008 Sep 5

Publication series

NameProceedings of the 6th International Conference on Engineering Computational Technology

Other

Other6th International Conference on Engineering Computational Technology, ECT 2008
CountryGreece
CityAthens
Period08/9/208/9/5

Keywords

  • Decohesion elements
  • Delamination growth
  • Quasi-static and dynamic analysis

ASJC Scopus subject areas

  • Computer Science(all)

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