Straight free-edge effects in laminated composites

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• 作者：Tian ; Zongshu ; Zhao ; Fengdong ; Yang ; Qingping
• 关键词：Laminated composites ; Special hybrid stress element ; Traction-free planar surface ; 3D stress analysis
• 刊名：Finite Elements in Analysis and Design
• 出版年：2004
• 出版时间：October, 2004
• 年：2004
• 卷：41
• 期：1
• 页码：1-14
• 全文大小：373 K

文摘

A new three-dimensional hybrid stress element with a traction-free planar surface has been developed for efficient analysis of the interlaminar stresses near traction-free straight boundaries. All 3D stress components are included and are interpolated independently within each layer. The expressions of six stress components are derived, such that the homogeneous equilibrium equations in each layer, the continuity of transverse stresses on the interlayer surface, the traction-free boundary conditions over the planar surface and lower surface of the laminated composite are satisfied a priori, while the interelement reciprocity condition is satisfied a posteriori through a Lagrange multiplier method. The use of such special element in the finite element solution has been shown to be highly accurate when only a very coarse element mesh is used near the free-edge.