5052铝合金室温轧制边缘裂纹的数值模拟

Numerical simulation of edge crack in 5052 aluminum alloy rolled at room temperature

利用Gleeble-1500D热模拟试验机进行了5052铝合金室温单向压缩和拉伸实验,根据实验数据得到了材料室温变形的本构方程为：σ=218.873ε0.073ε·0.0119＋27.309,断裂门槛值范围为：0.121~0.157,并由单向压缩和拉伸过程的数值模拟结果验证了所得本构方程和断裂门槛值范围的正确性。基于此,进行了室温轧制边缘裂纹生长过程的模拟并通过轧制实验对模拟结果进行了验证。结果表明,在总压下量为60%条件下,3道次轧制为最佳轧制道次,边缘裂纹长度最小,模拟值与实验值分别为1.3 mm和1.4 mm,误差为7%,其一致性很好。

Unidirectional compression and tensile experiments of 5052 aluminum alloy at room temperature were carried out by using a Gleeble-1500 D thermal simulator. According to the experimental data, the constitutive equation of the alloy deformation at room temperature was obtained as follows： σ = 218. 873 ε0. 073ε·0. 0119＋ 27. 309,and fracture threshold value was in the range of 0. 121-0. 157,and the correctness of the obtained constitutive equation and fracture threshold range was verified by the numerical simulation results of unidirectional compression and tensile process. Based on this,the growth process of edge crack in room temperature rolling was simulated and the simulation results were verified by rolling experiments. The results show that when the total reduction is 60%,the 3 pass rolling is the best way of rolling times,and the edge crack length is the smallest,the simulated and experimental values of the edge crack length are 1. 3 mm and 1. 4 mm,respectively,and the error is 7%,which shows that the agreement is very good.