提高轴孔连接结构承载能力的设计方法

文章针对轴孔连接结构提出了一种改善轴孔接触特性来提高承载能力的方法。以工程中通用的螺栓连接结构为例,建立接触分析模型,应用Persson接触理论和优化分析方法,通过优化耳片孔接触面的曲面形状和曲面参数实现了降低轴孔接触区最大接触应力及改善其分布梯度的目的。针对优化后的耳片孔接触曲面设计结果,利用有限元素法建立了螺栓耳片连接结构模型,分析验算了接触应力。结果表明,优化分析的解析法和有限元素法的计算结果基本一致。连接结构优化设计后,接触区最大应力降低50%以上,应力分布梯度明显改善,提高了其承载能力。

Optimal design of improving the carrying capacity of shaft and hole connection structure

In order to improve the contact characteristics of shaft and hole connection structure and improve its carrying capacity, one method was proposed. For a typical bolt and lug connection structure, the contact analysis model was established. By Persson contact theory and optimization method, the surface shape and its parameters of the contact surface of shaft and hole were optimized to lower the maximum contact stress and improve its distribution gradient. For the optimized design results of contact surface, using finite element analysis, the FEA model of bolt and lug connection structure was created to calculate the contact stress and verify the optimization results. The results show that the calculated results of analytical method and finite element method are basically the same. Through optimization, the maximum stress of the contact area is reduced by more than 50 percent and the stress distribution gradient is improved significantly. So the carrying capacity of shaft and hole connection structure is increased.