A new rate-dependent cohesive model for simulating dynamic composite delamination

Elmarakbi, Ahmed, Hu, Ning and Fukunaga, Hisao (2007) A new rate-dependent cohesive model for simulating dynamic composite delamination. In: ICCM-16 - 16th International Conference on Composite Materials, 8th - 13th July 2007, Kyoto, Japan.

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Abstract

A new eight-node adaptive rate-dependent cohesive element is proposed in this paper. 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 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 new cohesive element is implemented in LS-DYNA as a user defined material subroutine (UMAT) designed for solid elements. 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 and can be widely used in quasi-static, dynamic and impact problems.

Item Type:	Conference or Workshop Item (Paper)
Uncontrolled Keywords:	Adaptive cohesive element, Composite laminates, Dynamic delamination, Finite element analysis, Rate-dependent
Subjects:	J500 Materials Technology not otherwise specified
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Paul Burns
Date Deposited:	14 Feb 2019 17:36
Last Modified:	10 Oct 2019 23:46
URI:	http://nrl.northumbria.ac.uk/id/eprint/38019

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