Techno Press
Techno Press

Steel and Composite Structures   Volume 17, Number 2, August 2014, pages 159-172
DOI: http://dx.doi.org/10.12989/scs.2014.17.2.159
 
Investigation on low velocity impact on a foam core composite sandwich panel
Zonghong Xie, Qun Yan and Xiang Li

 
Abstract     [Full Text]
    A finite element model with the consideration of damage initiation and evolution has been developed for the analysis of the dynamic response of a composite sandwich panel subject to low velocity impact. Typical damage modes including fiber breakage, matrix crushing and cracking, delamination and core crushing are considered in this model. Strain-based Hashin failure criteria with stiffness degradation mechanism are used in predicting the initiation and evolution of intra-laminar damage modes by self-developed VUMAT subroutine. Zero-thickness cohesive elements are adopted along the interface regions between the facesheets and the foam core to simulate the initiation and propagation of delamination. A crushable foam core model with volumetric hardening rule is used to simulate the mechanical behavior of foam core material at the plastic state. The time history curves of contact force and the core collapse area are obtained. They all show a good correlation with the experimental data.
 
Key Words
    composite sandwich panel; crushable foam core model; low-velocity impact; delamination
 
Address
School of Astronautics, Northwestern Polytechnical University, Xi'an, China.
 

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