含多椭圆孔(核)复合材料加筋层板的应力集中研究

基于各向异性体平面弹性理论中的复势方法,应用杂交变分原理建立了一种与常规有限元相协调的含任意椭圆核各向异性板杂交应力有限元,采用该杂交应力有限元来描述层板的椭圆核区域,采用杆单元来描述加强筋(杆单元的刚度取为层板沿筋条方向的刚度),其余区域采用常规8节点等参单元进行模拟,建立起分析含多椭圆核复合材料加筋壁板问题的力学分析方法,详细讨论了椭圆核大小、位置、筋条尺寸、相对位置、铺层比例等诸参数的影响规律,得到了一些有益的结论。

Stress concentration analysis of stiffened composite laminates with multiple elliptical holes or inclusions

Based on the complex potential method in the plane theory of elasticity of an anisotropic plate containing an elliptical inclusion,and using hybrid variational principle,a hybrid stress element with an arbitrary elliptical inclusion for anisotropic plates has been established,which assorts with the conformal finite element.Using the hybrid finite element to describe the region with elliptical holes or inclusions,the stringer is modeled as bar element,other regions are modeled as 8-node isoparametric elements,the analytical method of a finite stiffened composite laminates with multiple elliptical holes or inclusions is set up.The effects of some parameters on the stress distribution are studied in detail.Some conclusions are drawn.