论文部分内容阅读
针对基于逆分析的杆-杆复合挤压流动应力和摩擦因子进行研究,结合有限元方法和优化算法的逆分析技术可以确定金属成形模拟过程中的材料参数。运用逆分析方法对杆-杆复合挤压模拟得到的载荷-行程曲线值和上、下杆高比值与实验测得的载荷-行程曲线值和上、下杆高比值进行比较及迭代优化,可以确定金属挤压成形过程中的真实流动应力和摩擦因子。通过挤压试验检验逆分析算法的有效性,使用逆分析方法对流动应力曲线进行修正,经过两次修正可以达到较好的挤压件精度,并获得挤压试验过程中的摩擦因子。
Based on the inverse analysis of rod-rod composite extrusion flow stress and friction factor research, combined with finite element method and optimization algorithm of inverse analysis technology can determine the metal forming simulation of the material parameters. The inverse analysis method was used to compare and iteratively optimize the load-stroke curve and the ratio of the upper and lower rods to the experimentally measured load-stroke curve and the upper and lower rod-height ratios. Determine the true metal extrusion process flow stress and friction factor. The squeeze test is used to test the validity of the inverse analysis algorithm. The inverse analysis method is used to correct the flow stress curve. After two corrections, the precision of the extrusion can be achieved and the friction factor during the squeeze test can be obtained.