复合材料双向加载试验件形状优化设计

Shape Optimization of a Composite Cruciform Specimen Under Biaxial Loading Condition

结合复合材料层合板双向加载试验的要求,对复合材料双向加载试验的十字形试验件进行了优化设计。应用Tsai-Wu准则确定复合材料试验件的破坏部位,保证破坏发生在试验区内。综合考虑了十字形试验件的倒角大小、两臂形状以及中心区域减薄等因素对试验区应变场的影响,借助Patran有限元软件和PCL参数化建模技术进行参数化建模,优化过程采用改进的蚁群算法与有限单元法相结合的方法。结果显示,优化得到的试验件形状能够较好地满足双向加载试验对试验件的破坏部位以及试验区应变均匀度的设计要求,试验件可以用于复合材料层合板的双向加载试验,不会在试验过程中发生单轴破坏现象。

The shape of a composite cruciform type specimen under biaxial loading conditions is optimized depending on the requirements of a successful biaxial test.Due to the difficulties in determining the failure zone,a new method is proposed based on the Tsai-Wu theory.Taking all the factors including the corner fillet,geometry of the arms and thickness into consideration,a FEM parametric modeling technique is coupled with a modified ACO to optimize the shape of the specimen.The optimization result shows that the optimized specimen in this paper can achieve a uniform strain field and meet the requirements of the failure zone.Therefore,the specimen of this type can be applicable to the biaxial tests and the failure would not occur in the uninterested area.