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

Ahmed M. Elmarakbi, Ning Hu, Hisao Fukunaga

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルProceedings of the 16th International Conference on Composite Materials, ICCM-16 - "A Giant Step Towards Environmental Awareness
ホスト出版物のサブタイトルFrom Green Composites to Aerospace"
出版ステータスPublished - 2007 12 1
イベント16th International Conference on Composite Materials, ICCM-16 - "A Giant Step Towards Environmental Awareness: From Green Composites to Aerospace" - Kyoto, Japan
継続期間: 2007 7 82007 7 13

出版物シリーズ

名前ICCM 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"
国/地域Japan
CityKyoto
Period07/7/807/7/13

ASJC Scopus subject areas

  • 工学(全般)
  • セラミックおよび複合材料

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