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本文是作者在美国特拉华大学航天机械工程系进修访问期间,在这一崭新力学领域所进行的科研课题的总结,迄今尚未发表。返国后,作了充实和加工,重新整理而成。本文中,作者对一般多向加强三维编织复合材料的弹性性质:弹性常数和波桑系数提出和发展了弹性能研究方法。考虑了复合材料结构微小单元的拉伸、弯曲和纤维相互挤压弹性变形能。最后,导出了确定复合材料轴向拉伸弹性常数和波桑系数的函数表达式,并把这一结果扩展到新型三维编织复合材料-Magnaweave的分析研究上。本文最后,就Magnawcave复合材料的弹性性质计算结果与实验结果比较,证明全部理论分析是合适的、正确的。
This article is a summary of the research projects carried out by this author in this new field of mechanics during the study tour of the Department of Aerospace Engineering at the University of Delaware, which has not yet been published. After returning home, made full and processing, reorganized. In this paper, the authors propose and develop methods to study the elastic properties of general three-dimensional braided composites that are generally multidirectional in their elastic properties: elastic constants and the Beaunson coefficient. The tensile, flexural and fiber deformability of micro-elements in composite structure are considered. Finally, a functional expression for determining the axial tensile elastic constants and the Beaujouis coefficient of the composite was derived and extended to the analysis of the new three-dimensional braided composite material, Magnaweave. At the end of this paper, the comparison between the calculated results of the elastic properties of Magnawcave composites and the experimental results proves that all the theoretical analyzes are suitable and correct.