摘要
在350、400和450℃温度下,对7075铝合金拉伸试样进行了应变速率0.001、0.01和0.1s-1的恒应变速率法拉伸试验;对预缩颈试样进行了速度为0.9和9mm·min-1的恒速拉伸试验;利用DEFORM-2D有限元软件对恒速拉伸过程进行模拟。结果表明:变形温度为影响7075铝合金断裂极限的主要因素;7075铝合金在研究温度范围内C^L损伤模型临界损伤值在0.79~1.42范围内变化;棒料拉伸过程中损伤值由中心向表面逐渐减小。
The tensile tests of 7075 aluminum alloy tensile samples were conducted at 350, 400 and 450 ℃ and strain rate range of 0. 001, 0.01 and 0.1 s 1 by using constant strain rate tensile method. And the tensile tests of prefabricated necking samples were conducted in the speed range of 0. 9 and 9 mm · min-1 by using constant speed tensile method. The fracture process of constant speed tensile was simulated by DEFORM-2D. The result shows that the fracture limit of 7075 aluminum alloy is mainly affected by deformation temperature, the C-L critical damage value of 7075 aluminum alloy changes from 0. 79 to 1.42, and the damage value decreases from the center to the surface of cylindrical samples.
出处
《塑性工程学报》
CAS
CSCD
北大核心
2016年第6期157-161,178,共6页
Journal of Plasticity Engineering
基金
江西省科技支撑重点项目(20141BBE50011)
关键词
7075铝合金
高温变形
损伤极限
本构方程
临界损伤值
7075 aluminum alloy
high temperature deformation damage limit
constitutive equation
critical damage value