3104铝合金薄板深冲制耳的有限元模拟

FEM Simulation of the Earing of 3104 Aluminum Sheets

摘要:

采用由板材织构信息进行加权的CMTP屈服函数并考虑了摩擦和压边力的变化对3104铝合金薄板的深冲制耳进行了有限元模拟；并与采用Barlat(1991)屈服函数的预测值及实测值进行了比较；分析了深冲过程中圆片的厚度变化规律；讨论了进一步提高预测精度需考虑的因素。结果表明：采用CMTP屈服函数模拟的制耳轮廓与实测值比较吻合，随摩擦和压边力的增加，制耳轮廓高度也增加；且比采用Barlat(1991)屈服函数模拟的精度要高。模拟深冲过程中圆片厚度的变化规律与实际情况一致。

Abstract:

A CMTP yield function considering texture-component information is directly used in finite element code ABAQUS, taking friction and blank holder force into account, to simulate the earing of 3104 aluminum alloy sheet during deep drawing. The predictions obtained from CMTP yield function are compared with those from Barlat 1991 yield function and experimental earing profiles. The thickness variation induced by deep drawing is also described. Further improvements in the accuracy of the simulations are also discussed. Reasonable agreement is obtained between the predictions from CMTP yield function and the measured earing profiles. The predictions of earing behavior of 3104 aluminum alloy sheets from CMTP yield function is more accurate than from Barlat 1991 yield function. The thickness variation of blank in the simulation is accorded with the practice process, which shows increasing the friction and blank holder force enable the height of earing to increase.