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Elasto-plastic Response of Composite Structures under the Impact Loading by Spline Element Method

样条元法研究冲击载荷下复合材料结构的弹塑性响应

基本信息

批准号：
04650412
负责人：
MIZUSAWA Tomisaku
金额：
$ 0.9万
依托单位：
Daido Institute of Technology, Faculty of Engineering
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

In this study, vibration and elasto-plastic dynamic responses of fiber-composite laminated plates and cylindrical shell panels were analyzed by the spline element methods based on the shear deformation theories. The effects of lamina sequence, the number of lamina and geometrical parameters on the failure modes and the propagation of failure of the omposite laminated structures.1) Vibrating Characteristics of Composite Laminated Plates and Cylindrical PanelsThe spline strip method which is a semi-analytical model based on the higher-order shear defotmation theory is presented to analyze vibration of fiber-composite laminated plates and cylindrical panels. The effect of thickness ratio, moduli ratio and stacking sequence of lamina on the frequencies of cross-ply and angle-ply laminated plates and shells were investigated. High flexibility of composite structures has been obtained by selecting the stacking sequance of lamina and fiber-oriantation angle.2) Elasto-plastic Response of Composite Laminated Plates and Cylindrical Panels due to Impact LoadingDynamic failure of fiber-composite laminated plates and cylindrical planels under the action of impact load by using an isoparametric degenerated element and the von Mises yield criterion combined with the Prandtl-Reuss flow rule. The effects of thickness ratio, angle of lamination, stacking sequence of lamina and boundary condition on the dynamic deformations and the propagation of yield region through thickness and each lamina are investigated. It is seen that the different failure modes and failure propagation due to the thickness ratio and lamina structure have been observed.

本文采用基于剪切变形理论的样条单元法，分析了纤维复合材料层合板和圆柱壳的振动和弹塑性动力响应。研究了铺层顺序、铺层层数和几何参数对复合材料层合结构失效模式和失效传播的影响。1）复合材料层合板和圆柱壁板的振动特性本文提出了一种基于高阶剪切变形理论的半解析模型-样条法，用于分析纤维复合材料层合板和圆柱壁板的振动。研究了正交铺设和角铺设层合板壳的厚度比、弹性模量比和铺层顺序对层合板壳频率的影响。2）冲击载荷作用下复合材料层合板和圆柱板的弹塑性响应采用等参退化单元和von Mises屈服准则，结合Prandtl-Reuss流动法则，研究了冲击载荷作用下纤维复合材料层合板和圆柱板的动力破坏。研究了厚度比、层合角、层合顺序和边界条件对动态变形以及屈服区沿厚度和各层的传播的影响。可以看出，不同的失效模式和失效传播，由于厚度比和层结构已被观察到。