Finite element simulation of delamination growth in composite materials using LS-DYNA

Elmarakbi, Ahmed, Hu, Ning and Fukunaga, H. (2009) Finite element simulation of delamination growth in composite materials using LS-DYNA. Composites Science and Technology, 69 (14). pp. 2383-2391. ISSN 0266-3538

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Abstract

In this paper, a modified adaptive cohesive 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 pre-softening 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 cohesive model is developed to be dependent 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, overcoming the numerical instability and can be widely used in quasi-static, dynamic and impact problems.

Item Type:	Article
Uncontrolled Keywords:	Cohesive elements, Delamination growth, Finite element analysis, Quasi-static and dynamic analysis
Subjects:	H300 Mechanical Engineering J500 Materials Technology not otherwise specified
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Paul Burns
Date Deposited:	14 Jan 2019 18:08
Last Modified:	11 Oct 2019 14:34
URI:	http://nrl.northumbria.ac.uk/id/eprint/37582

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