单元技术及网格剖分对弯曲应力的影响研究

使用实体单元技术可以处理剪切锁定的问题，由于个人经验与知识积累的不同，使得计算的精度和效率存在差 异，若不进行分析，带来的后果可能是致命的。为解决该问题，文章以悬臂梁的弯曲应力作为判断依据，详细研究了缩减 积分、一致缩减积分、增强应变和简单增强应变等实体单元技术及网格剖分对弯曲应力的影响。结果表明：在线性静力 学分析中优先选取高阶单元；若采用低阶单元，推荐增强应变或简化增强应变的六面体来计算弯曲应力。该结论为细长 或薄壁结构零件弯曲应力计算时的单元技术选择和网格划分及单元层数提供了参考准则。

Effect of Different Element Technology and Mesh Division for Bending Stress

Using element technology can handle shear locking, and because of the personal experiences and knowledge, the difference between accuracy and efficiency often occurs, which will lead to fatal consequences if no analysis. A throughly study about the influence of element technology(B-bar, URI, ES, SES) and solid mesh division for bending stress according to the stress of cantilever beam was presented. The results show that the high order elements should be selected priority in the linear static analysis, and the enhanced strain or simplify enhanced strain hexahedral is recommend to calculate the bending stress for low order elements in the linear static analysis. The conclusion provides a reference for the selection of element technology, meshing and cell layers, when bending stress calculation of the slender or thin-walled structure is occured.