Comparison and Research on Fatigue Strength Analysiswith Different FE Modeling Methods

QU Wenhui; MI Caiying

doi:10.13890/j.issn.1000-128x.2016.05.012

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Comparison and Research on Fatigue Strength Analysiswith Different FE Modeling Methods

更新时间：2021-12-13

- Comparison and Research on Fatigue Strength Analysiswith Different FE Modeling Methods
- Electric Drive for Locomotives Issue 5, Pages: 47-50(2016)
- 作者机构：
  
  1. 西南交通大学机械工程学院,四川,成都,610031
- 作者简介：
- 基金信息：
- DOI：10.13890/j.issn.1000-128x.2016.05.012
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QU Wenhui, MI Caiying. Comparison and Research on Fatigue Strength Analysiswith Different FE Modeling Methods. [J]. Electric Drive for Locomotives (5):47-50(2016)
DOI：

QU Wenhui, MI Caiying. Comparison and Research on Fatigue Strength Analysiswith Different FE Modeling Methods. [J]. Electric Drive for Locomotives (5):47-50(2016) DOI： 10.13890/j.issn.1000-128x.2016.05.012.

摘要

为了提高工程结构强度分析的效率，基于ANSYS 和HyperMesh 平台建立了某型号机车焊接构架的全实体单元模型和体—壳混合单元模型，并对这2 种建模方法的建模时间、分析周期及疲劳强度的计算精度进行了对比分析。针对体—壳混合单元组合建模中存在的体、壳单元连接处自由度不匹配的问题，在接口引入了RBE2刚性连接单元来提高计算精度。研究表明：全实体单元建模方法在工作量、分析周期以及有限元模型的规模等方面，都数倍于体—壳混合单元组合建模方法；采用合理的体、壳单元连接措施后，其疲劳强度分析计算精度的相对误差能控制在10% 的范围内，对提高工程结构强度分析效率具有良好的应用价值。

Abstract

In order to improve the efficiency of engineering structural strength analysis, two types of model that solid element modeland solid-shell element model were created based on ANSYS and HyperMesh software. The comparison of these two modeling methodswas done on some aspects such as modeling time, period of analysis and accuracy of fatigue strength analysis. The accuracy of solidshellelement model was improved by introducing RBE2 rigid element at the interface of solid and shell elements. This research showedthat, solid-shell element modeling method was far better than solid element modeling method in terms of workload, period of analysis andscale of FE model. The accuracy relative error of fatigue strength with some measures of solid-shell element interface could be controlledwithin 10%, therefore, this method has a good reference to improve the efficiency of strength analysis in actual project.

关键词

疲劳强度混合单元RBE2建模方法计算精度分析效率

Keywords

fatigue strengthmixing elementRBE2modeling methodsaccuracyanalysis efficiency

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