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Indexed by:期刊论文

Date of Publication:2011-08-01

Journal:SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY

Included Journals:SCIE、EI

Volume:54

Issue:8

Page Number:1481-1487

ISSN No.:1674-7348

Key Words:viscoelasticity; interfacial crack; rate-dependent cohesive model; composite sandwich beam

Abstract:A sandwich beam model consisting of two face sheets and a foam core bonded by a viscoelastic adhesive layer is considered in order to investigate interfacial fracture behavior. Firstly, a cohesive zone model in conjunction with a Maxwell element in parallel, or with a Kelvin element in series, respectively, is employed to describe the characteristics of viscoelasticity for the adhesive layer. The models can be implemented into the implicit finite element code. Next, the parametric study shows that the influences of loading rates on the cohesive zone energy and strength are quite different for different models. Finally, a sandwich double cantilever beam model is adopted to simulate the interface crack growth between the face sheet and core. Numerical examples are presented for various loading rates to demonstrate the efficacy of the rate-dependent cohesive models.