【摘 要】
：
The flatwise tension (FWT) and single leg bending (SLB) tests were used to investigate the fracture behavior of honeycomb sandwich specimens. In the FWT test, o
【机 构】
：
School of Materials Science and Engineering,Center for Composite Materials and Structures
【基金项目】
：
the Heilongjiang Postdoctoral Grant and the National Science Foundation for Post-doctoral Scientists of China
论文部分内容阅读
The flatwise tension (FWT) and single leg bending (SLB) tests were used to investigate the fracture behavior of honeycomb sandwich specimens. In the FWT test, only the interlaminar delamination was observed. The test results show that the interfacial peel strength is higher than the interlaminar peel strength. In terms of SLB experiment, a new fracture mode was found, namely IKP (initiation of interlaminar delamination, kinking into facesheet and propagation of interlaminar delamination). The virtual crack closure technique was applied to separate the values of Mode 1 and Mode II components of the strain energy release rate in SLB experiment. The finite element analysis result shows that the Mode I strain energy release rate is higher than the Mode II strain energy release rate. To simulate the failure of SLB test of honeycomb sandwich specimens, a new computational model based on the Tsai-Hill failure criterion and the cohesive zone model is proposed. In comparison with ex-perimental results, it can be concluded that the computational model can validly simulate the IKP of a honey-comb sandwich structures with reasonable accuracy.
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