Mechanical Performance and Failure Mechanism of Thick-walled Composite Connecting Rods Fabricated by Resin Transfer Molding Technique
Mechanical Performance and Failure Mechanism of Thick-walled Composite Connecting Rods Fabricated by Resin Transfer Molding Technique
复制标题
树脂传递模塑厚壁复合材料连杆的力学性能及失效机理
DOI：
10.1007/s10443-014-9415-2
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发表时间：
2015
影响因子：
2.3
通讯作者：
Yi Xiaosu
中科院分区：
文献类型：
--
作者：
Liu Gang;Luo Chuyang;Zhang Daijun;Li Xueqin;Qu Peng;Sun Xiaochen;Jia Yuxi;Yi Xiaosu
采用树脂传递模塑技术制备了厚壁复合材料连杆，并对其力学性能进行了实验研究，同时对应力和失效指标分布进行了数值模拟。实验结果表明，在拉伸载荷作用下，连杆首先在两端三角形区域顶点附近发生裂纹，然后损伤沿着主承载梁与三角形区域的界面以及三角形区域的圆角扩展。而在压缩载荷作用下，分层主要发生在U型翼缘拐角处，最终破坏是由主承载梁中的纤维断裂引起的。模拟结果表明，拉伸破坏源于T型接头圆角过渡区的分层，破坏强度由层间强度决定。而压缩破坏是由主承载梁中纤维断裂引起的，结构的破坏强度由复合材料的纵向压缩强度决定。模拟结果与实验结果基本一致。因此，通过两种研究方法的耦合，可以详细揭示复杂复合材料结构的力学性能和失效机理，有助于复合材料结构的优化设计。
A resin transfer molding technique was used to fabricate thick-walled composite connecting rods, and then the mechanical performance of the connecting rod was studied experimentally, at the same time the stress and failure index distributions were simulated numerically. The experimental results show that under a tensile load, the connecting rod first cracks near the vertex of the triangle areas at the two ends, and then the damage propagates along the interface between the main bearing beam and the triangle area as well as along the round angle of the triangle area. Whereas under a compressive load, the delamination primarily occurs at the corner of the U-shaped flange, and the final destruction is caused by the fracture of fibers in the main bearing beam. The simulated results reveal that the tensile failure is originated from the delamination at the round angle transition areas of the T-joints, and the failure strength is determined by the interlaminar strength. Whereas the compressive failure is caused by the fracture of fibers in the main bearing beam, and the failure strength of the structure is determined by the longitudinal compressive strength of the composite material. The simulated results are basically consistent with the experimental results. Hence the mechanical performance and failure mechanism of the complicated composite structure are revealed in great detail through the coupling of the two kinds of research methods, which is helpful for the optimal design of composite structures.