点击次数：

论文类型：期刊论文

发表时间：2011-08-01

发表刊物：SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY

收录刊物：SCIE、EI

卷号：54

期号：8

页面范围：1481-1487

ISSN号：1674-7348

关键字：viscoelasticity; interfacial crack; rate-dependent cohesive model; composite sandwich beam

摘要：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.