螺旋线螺纹模型的有限元分析

Finite element analysis of helical thread model

针对精细化模型与Abaqus摩擦模型所存在问题,提出一种基于螺纹几何特征的螺旋线螺纹模型,采用脚本语言实现了螺旋线螺纹模型生成自动化,并应用到某发动机机体主轴承盖螺栓螺孔的强度分析.分析结果表明,仿真计算得到的螺栓及机体螺孔处的应力很好地表征了螺栓连接结构螺纹处的实际应力分布,与螺纹精细模型相近,比Abaqus摩擦模型精度更高,且计算方便、实用、高效,验证了本文方法的准确、可行.

A helical thread model based on thread geometry characteristics is proposed to resolve the issues in the fine thread model and Abaqus frictional model. The mesh in the proposed model is generated automatically by a Hypermesh script. The helical thread model was applied to the main bearing cap bolt and the bolt hole of an engine bulkhead. The analytical results show that the stress at the bolt and the bolt hole of the block can well represent the actual stress distribution at the thread area, and it is similar to the results with the corresponding fine thread model. Compared to the fine thread model, the proposed approach is convenient, practical and efficient in engineering application. It is more accurate compared to that of Abaqus frictional model, which indicates that the presented method is accurate and feasible.