Stress and residual stress distributions in plane strain bending
Stress and residual stress distributions in plane strain bending
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DOI：
10.1016/s0020-7403(97)00075-1
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发表时间：
1998-06
影响因子：
7.3
通讯作者：
Z. T. Zhang;S. Hu
中科院分区：
文献类型：
--
作者：
Z. T. Zhang;S. Hu
弯曲过程中的应力和残余应力分布是计算板料弯曲件回弹和承载能力的重要依据。不同研究人员在相同输入(基准问题)下的回弹预测存在很大差异。为了找出这些差异的根本原因，对平面应变弯曲应力和残余应力的计算方法进行了简要的回顾和发展。研究了变形理论和增量理论、重复弯曲、不弯曲和再弯曲、循环材料模型和回弹计算方法对应力或残余应力分布的影响。这强调了除了材料特性、刀具几何形状和摩擦条件等其他一般输入变量外，在仿真模型中仔细选择这些变量的重要性。这一事实也有助于解释不同研究结果之间的巨大差异，并对有限元程序的编程人员和用户提出了挑战。
Stress and residual stress distributions in bending are important in calculating springback and loading capacity of a sheet-metal bending part. Great differences have been found in springback prediction with the same input (benchmark problems) among different researchers. In order to find out the root cause of these differences, stress and residual stress calculation methods in plane strain bending are briefly reviewed or developed. The influence of deformation theory and incremental theory, repeating bending, unbending and re-bending, cyclic material models and springback calculation methods on the stress or residual stress distributions are examined and shown to be large. This emphasizes the importance of careful selection of these variables in a simulation model in addition to other general input variables, such as material properties, tool geometry and friction condition. This fact also helps to explain the great differences among different research results, and presents a challenge to both the programmers and the users of finite element packages.