Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics
Online ISSN : 2424-2837
セッションID: OS14-3-5
会議情報
OS14-3-5 Adaptive rate-dependent interface models: formulation and numerical analysis of progressive delamination in composite materials
Ahmed ElmarakbiNing HuHisao Fukunaga
著者情報
会議録・要旨集 フリー

詳細
抄録
A new 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 the explicit finite element code (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.
著者関連情報
© 2007 一般社団法人 日本機械学会
前の記事 次の記事
feedback
Top