X-cor夹层结构的有限元模型

Finite Element Model of X-cor Sandwich Structure

结合有限元模型中对Z-pin的处理方式,提出整体式、组合式以及分离式3种计算模型,分析其适用性及优缺点。在桥联力实验和Z-pin从泡沫拔脱实验研究的基础上,提出分离式有限元模型,引入双弹簧联结单元来揭示Zpin和泡沫及面板之间相互作用的细观机理;其中平行于Z-pin单元接触面的弹簧(刚度)用来模拟计算界面相对滑移和粘接应力,垂直于单元接触面的弹簧(刚度),用于定义层压板、泡沫与Z-pin法向的接触,实现了X-cor夹层结构力学行为和界面失效的有限元仿真计算。

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