论文部分内容阅读
本文在总结前人对复合材料结构开口的应力集中研究的基础上,根据孔口附近应力场的特点,提出了一种适于工程应用的复合材料叠层结构开口附近应力分析的有限元改进算法。由于应力计算精度的改进仅在孔边、拐角等高应力梯度区域局部进行,且改进后的单元能进一步精确描述应力集中区的应力场。因而,使用该方法计算孔边应力,用较少的单元就能得到满意的精度,大大减少了计算费用和时间。 文中选择了一些有代表性的考题验证了该方法的有效性。并着重研究了带有圆角矩形孔的复合材料层板结构的孔边应力分布,给出应力集中系数随圆角半径的变化规律、孔边加强对应力集中的改善以及±45°纤维铺层比例对孔边应力分布的影响,得到了一些对工程部件开口设计有用的数据资料。
Based on the previous studies on the stress concentration of composite structures, this paper presents a new finite element method (FEM) for stress analysis near the openings of composite structures that is suitable for engineering application according to the characteristics of stress field near the orifice. . Because the improvement of stress calculation accuracy is only carried out locally in the region of high stress gradient such as hole edge and corner, the improved unit can further describe the stress field in stress concentration area. Therefore, using this method to calculate hole-edge stress, the accuracy can be reduced with fewer elements, greatly reducing the computational cost and time. In this paper, some representative questions are selected to verify the validity of the method. The hole edge stress distribution of composite laminates with rounded rectangular holes is emphatically studied. The variation of stress concentration factor with the fillet radius is given. The improvement of stress concentration by hole edge reinforcement and the improvement of ± 45 ° fiber layup The influence of the ratio on the stress distribution at the edge of the hole has obtained some useful data for the design of the opening of engineering components.