论文部分内容阅读
基于7B04铝合金165℃单轴拉伸蠕变试验数据,拟合得到时间硬化本构方程,利用有限元软件ABAQUS对带筋构件的蠕变时效成形过程进行数值模拟,分析筋条的变形规律,并进行验证试验和性能研究。结果表明:筋条的塑性变形有效减小蒙皮的回弹,和蠕变变形共同决定构件外形;数值模拟与试验结果吻合较好,构件95%外形区域的绝对偏差值≤0.50 mm;构件的筋条强度高于蒙皮强度,与无应力时效相比,构件的伸长率降低,电导率升高;应力松弛试样的性能和筋条的性能相近,可以进行等效表征。
Based on the uniaxial tensile creep test data of 7B04 aluminum alloy at 165 ℃, the time-hardening constitutive equation was fitted and the finite element software ABAQUS was used to simulate the creep-aging forming process of the stiffened members, And verify the test and performance study. The results show that: the plastic deformation of the ribs effectively reduce the skin’s rebound, and the creep deformation together determine the component shape; the numerical simulation is in good agreement with the experimental results; the absolute deviation value of the 95% component area is ≤0.50 mm; The strength of the ribs is higher than the strength of the skin. Compared with the non-stress aging, the elongation of the members decreases and the conductivity increases. The properties of the stress relaxation specimens are similar to those of the ribs, and can be equivalently characterized.