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

Ahmed M. Elmarakbi, Ning Hu, Hisao Fukunaga

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

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.

Original languageEnglish
Title of host publicationProceedings of the 16th International Conference on Composite Materials, ICCM-16 - "A Giant Step Towards Environmental Awareness
Subtitle of host publicationFrom Green Composites to Aerospace"
Publication statusPublished - 2007 Dec 1
Event16th International Conference on Composite Materials, ICCM-16 - "A Giant Step Towards Environmental Awareness: From Green Composites to Aerospace" - Kyoto, Japan
Duration: 2007 Jul 82007 Jul 13

Publication series

NameICCM International Conferences on Composite Materials

Other

Other16th International Conference on Composite Materials, ICCM-16 - "A Giant Step Towards Environmental Awareness: From Green Composites to Aerospace"
CountryJapan
CityKyoto
Period07/7/807/7/13

Keywords

  • Adaptive cohesive element
  • Composite laminates
  • Dynamic delamination
  • Finite element analysis
  • Rate-dependent

ASJC Scopus subject areas

  • Engineering(all)
  • Ceramics and Composites

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  • Cite this

    Elmarakbi, A. M., Hu, N., & Fukunaga, H. (2007). A new rate-dependent cohesive model for simulating dynamic composite delamination. In Proceedings of the 16th International Conference on Composite Materials, ICCM-16 - "A Giant Step Towards Environmental Awareness: From Green Composites to Aerospace" (ICCM International Conferences on Composite Materials).