共查询到17条相似文献,搜索用时 171 毫秒
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V型模中薄板弯曲的弹性变形和弹塑性变形分析 总被引:1,自引:0,他引:1
对薄板在V型模中弯曲的弹性变形和弹塑性变形进行了深入的理论分析,指出弯曲变形常伴有弯曲支点的移动,给出了弯曲支点位置与弯曲力的关系及极限弹性弯曲曲率半径,为深入研究弯曲回弹提供了基础。 相似文献
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板料弯曲减薄系数的计算 总被引:4,自引:1,他引:3
通过对板料弹塑性弯曲变形分析,利用材料力学中的平面曲杆理论,提出了大曲率弹性变形应变中性层向内移动的观点,并推导出了板弯弯曲减薄系数的计算公式。 相似文献
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A new mathematical model is presented for plane strain bending and springback analysis in sheet metal forming. This model
combines effects associated with bending and stretching, considers stress and strain distributions and different thickness
variations in the thickness direction, and takes force equilibrium into account. An elastic-plastic material model and Hill’s
nonquadratic yield function are incorporated in the model. The model is used to obtain force, bending moment, and springback
curvature. A typical two-dimensional draw bending part is divided into five regions along the strip, and the forces and moments
acting on each region and the deformation history of each region are examined. Three different methods are applied to the
two-dimensional draw bending problems: the first using the new model, the second using the new model but also including a
kinematic directional hardening material model to consider the bending and unbending deformation in the wall, and the third
using membrane theory plus bending strain. Results from these methods, including those from the recent benchmark program,
are compared.
University of Michigan, Dept. of Mechanical Engineering and Applied Mechanics, Ann Arbor, Mi 48109, USA. 相似文献
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将宽板拉弯的变形区划分成若干个单元,按单元的塑性变形体积不变条件确定应变,利用增量理论,求算宽板拉弯的应力分布,并依据应力分布曲线,计算回弹及残余应力。 相似文献
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金属板弹塑性非圆弧弯曲回弹的计算 总被引:20,自引:4,他引:16
本文提出了计算金属板弹塑性非圆弧弯曲回弹的结构离散方法,建立了计算回弹后零件形状及回弹前模具形状的解析一数值混合计算模型,实验验证表明此套计算模型的计算精度良好。 相似文献