To study the stress-strain principle of AZ31B magnesium alloy sheet rolling,the numerical simulation of the single-pass cold rolling process of AZ31B magnesium alloy sheet was conducted under different rolling pro-cess by using Johnson-cook constitutive relation. Under the varying rolling reduction of 2%, 5%, 8% and the strain rate of 0.1s-1,1.0 s-1,10.0 s-1,numericalinvestigations of the stress-strain response of rolled part were carried out at the various combinations of rolling reduction and strain rate,respectively. The simulation re-sults show that the local maximum stress is 267.100 MPa,which was lower than the limit stress 282.900 MPa of materials, in the deformation process of AZ31B magnesium alloy plate when thesingle-passrollingreduction was5%and the strain rate was 10.0 s-1. The local maximum strain was 4.454×10-2,less than the macro fracture strain 0.2. Compared with other combinations,it was a more reasonable cold rolling process of AZ31B magnesium alloy.%为了研究AZ31B型镁合金板材在室温轧制成形过程中应力应变响应规律,采用Johnson-cook本构关系对AZ31B镁合金板材在不同轧制工艺下的单道次冷轧成形进行数值模拟.分别在压下量为2%、5%、8%,应变速率分别为0.1 s-1、1.0 s-1、10.0 s-1的条件下,开展了不同压下量及不同应变速率组合对轧件应力应变响应的模拟研究.模拟结果表明,在压下量为5%,应变速率为10.0 s-1时,AZ31B镁合金板材变形过程中的局部最高应力为267.100 MPa,低于材料极限应力282.900 MPa.局部最高应变为4.454×10-2,低于宏观断裂应变0.2.相比其他工艺条件,此条件是较为合理的冷轧工艺.
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