FE Contact Search Model Research in Sheet Metal Forming
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摘要: 基于参数曲面描述法和有限元网格描述法,提出模具几何形状模型的曲面单元描述法,采用了逐级更新的接触搜索算法,推导出求交迭代初值优化选择方案及满足无穿透原理的接触判断准则,并建立了板料成形数值模拟接触搜索模型,此模型不仅改善了数值模拟的收敛性,而且提高了计算效率和稳定性.Abstract: On the basis of the parametric curved-surface tool description and finite element meshing tool description, a curved-surface & element description method for the tool geometric shape model is established. An updated global & local contact search algorithm is introduced. An optimized selection for intersected iterative initial value and a contact judgement rule based on the no-penetration theory is deduced. Then a finite element contact search model for numerical simulation in sheet metal forming processes is set up. The model not only improves the astringency of the finite element numerical simulation, but also enhances the efficiency & stability of the numerical simulation of contact processes. The astringency, efficiency & stability of this model are verified well by calculation and experiment.
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Key words:
- sheet metals /
- numerical simulation /
- contact problems
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