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利用有限元软件ANSYS建立了单钉双剪复合材料单拉接头的1/2模型,研究了钉孔配合、螺栓预紧力和接触面间摩擦对接头的强度等性能的影响。设计了若干实验,证明有限元模型是有效的,其计算误差控制在10%以内。有限元计算结果表明:小干涉量的过盈配合能极大地提高接头的强度,与3%间隙量相比,最优干涉量下接头强度可提高36.5%;适当的螺栓拧紧力矩也可提高接头的强度;接头中被连接板间的摩擦对接头强度也是有利的,但在一定接头尺寸条件下,摩擦力的增大有可能会改变接头的破坏模式。以上研究成果为复合材料多钉连接钉载分配均匀化的参数化分析提供了一个突破口,这也是本文后续研究的一个内容。
The finite element software ANSYS was used to establish the 1/2 model of the single-spliced and double-spliced single-spliced composite, and the influence of the nail-spline fit, the bolt pretightening force and the friction between the contact surfaces on the strength of the spliced joint was studied. Several experiments have been designed to prove that the finite element model is effective and the calculation error is controlled within 10%. The results of finite element calculation show that the interference fit of small interference can greatly improve the strength of the joint, and the joint strength can be increased by 36.5% under the optimal interference compared with the 3% clearance. The proper bolt tightening torque can also improve the joint The strength of the joint is also beneficial to the strength of the joint, but under certain joint size, the increase of the friction force may change the failure mode of the joint. The above research results provide a breakthrough for the parametric analysis of the uniform distribution of the staples in the multi-spliced composite material, which is also a part of the follow-up study.