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为了研究含螺栓复合材料层压板连接接头的层间应力分布规律,提出了采用填充孔形式和虚拟界面层方法求解层间应力,并建立了三维有限元模型对受面内压缩载荷的螺栓夹持填充孔层压板进行分析。结果表明:层压板层间应力集中不仅发生在孔边,还会在螺栓头边缘附近出现,且夹持力越大螺栓头边缘附近的层间应力集中越严重;合理的螺栓夹持力能改善孔边应力状态,提高孔边抵抗分层的能力,但无法改善螺栓头边缘附近的层间剪切应力集中状态。因此,在进行含螺栓夹持的层压板机械连接结构孔边层间强度设计时,也要考虑螺栓头边缘的层间剪切应力集中问题,以提高复合材料结构的安全性。
In order to study the stress distribution law of interlaminar joints in bolted composite laminates, the method of filling holes and virtual interfacial layer was proposed to solve the interlaminar stress. A three-dimensional finite element model Fill the hole laminate for analysis. The results show that the interlayer stress concentration in the laminate not only occurs at the edge of the hole, but also occurs near the edge of the bolt head. The greater the clamping force, the more serious the stress concentration in the interlayer near the edge of the bolt head. The reasonable bolt clamping force can be improved Hole-edge stress state, to improve the hole edge resistance to delamination, but can not improve the bolt head edge near the shear stress concentration state. Therefore, the interlayer shear stress concentration at the edge of the bolt head must also be taken into consideration when designing the strength of the interlayer between the holes in the mechanical connection structure of the bolt-containing laminate, so as to improve the safety of the composite structure.