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为了提高工程结构强度分析的效率,基于ANSYS和Hyper Mesh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。
In order to improve the efficiency of engineering structural strength analysis, an all-solid element model and a body-shell compound element model of a welded locomotive locomotive are established based on ANSYS and Hyper Mesh. The modeling time and analysis period And fatigue strength of the calculation accuracy of a comparative analysis. In order to solve the problem of mismatch of the degrees of freedom of body and shell elements in the modeling of body-shell hybrid elements, RBE2 rigid connection element is introduced in the interface to improve the calculation precision. The research shows that all-solid-element modeling method is several times as many as the combination modeling method of body-shell hybrid elements in terms of workload, analysis period and the size of the finite element model. After reasonable measures of body- The relative error of fatigue strength analysis and calculation accuracy can be controlled within 10%, which has a good application value to improve the strength of engineering structural analysis.