Finite Element Model of X-cor Sandwich Structure

Referring to the mode of Z-pin pre-processing, three kinds of finite element method models including assembled, combined and separated model are introduced. Applicability, advantage and disadvantage of the models are presented, which provide the references for the designers to use finite element method. On the basis of Z-pin bridging law by pullout test and Z-pin pulled out from foam test, separated model of X-cor sandwich structure for finite element analysis is introduced. Double spring coupling elements are introduced to reveal microscopic mechanism of interaction between Z-pin, foam and face-sheets in separated model. The spring parallel to Z-pin interface simulates the relative slip and analyzes the adhesive stress of interface, the spring perpendicular to Z-pin interface simulates the transverse elastic supporting of foam to Z-pin buckling. The finite element simulation on mechanical behavior and interface failure of X-cor sandwich structure are realized.