摘要
采用刚塑性有限元法对2017铝合金等通道转角挤压(ECAP)进行热力耦合的数值模拟,分析了模具外角(0~50°)对ECAP过程中载荷、工件中等效应变及其均匀性和工件温度的影响。研究结果表明:随着模具外角增大,载荷峰值和等效应变迅速下降,然后下降幅度越来越小,降至30°左右均趋于稳定;而等效应变的均匀性则随着模具外角增大先提高后略有降低,在模具外角为20°时应变均匀性最好。随着模具外角增大,工件整体温度一直下降,降幅越来越小。
The thermomechanical coupled numerical simulation of equal channel angular pressing for 2017 aluminum alloy was carried on by rigid-plastic finite element method. The effect of the outer comer angle （0-50°） on variation of extrusion load, equivalent strain and its homogeneity as well as the sample temperature was studied. The results show that, with the increase of outer comer angle, the maximum extrusion load and the equivalent strain decreases abruptly at first, and then decreases slowly and the tendency changes mildly after the outer comer angle is higher than 30~. Whereas, the equivalent strain homogeneity increases firstly and then decreases slightly with the increase of outer comer angle and it is the best at 20°. In addition, with the increase of outer comer angle, the sample temperature decreases steadily. Key words： equal channel angular pressing （ECAP）; outer comer angle; numerical simulation; 2017 aluminum alloy
出处
《铸造技术》
北大核心
2017年第6期1371-1375,共5页
Foundry Technology
基金
国家自然科学基金(51275051)
光机电装备技术北京市重点实验室开放课题(KF2013-01)资助项目
