Revisiting the wrinkling limits in flexible roll forming
Revisiting the wrinkling limits in flexible roll forming
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DOI：
10.1177/0309324715590956
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
MM Kasaei;H. M. Naeini;G. Liaghat;Cma Silva;M.B. Silva;P. Martins
中科院分区：
文献类型：
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作者：
MM Kasaei;H. M. Naeini;G. Liaghat;Cma Silva;M.B. Silva;P. Martins
本文对柔性辊弯成形的变形机理提出了新的认识，并着重讨论了翻边起皱的发生。介绍了从柔性辊轧成形的实验和数值模拟的确定，通过一个新的理论和实验方法的基础上利用矩形试样加载轴向压缩的波纹限制。这项研究工作是在低碳钢板和结果表明，从柔性辊轧成形的有限元建模和加载在轴向压缩的矩形试样得到的有效应变与应力三轴度的组合演化可以成功地利用预测发生的凸缘波纹的柔性辊轧成形生产的变截面轮廓。因此，拟议的方法可被视为现有基于简化分析和数值程序的方法的替代方法。
This article presents a new understanding on the deformation mechanics of flexible roll forming and is focused on the occurrence of flange wrinkling. The presentation draws from the experimental and numerical simulation of flexible roll forming to the determination of the wrinkling limits by means of a new theoretical and experimental methodology based on the utilization of rectangular test specimens loaded in axial compression. This research work is performed in mild steel sheets and the results show that the combined evolution of the effective strain with stress triaxiality obtained from finite element modelling of flexible roll forming and from the rectangular test specimens loaded in axial compression can be successfully utilized to predict the occurrence of flange wrinkling in variable cross-sectional profiles produced by flexible roll forming. The proposed methodology can, therefore, be considered an alternative to existing approaches based on simplified analytical and numerical procedures.