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将MK模型与韧性断裂准则相结合,提出预测不同温度下5A06-O铝合金板材成形极限的新模型。基于宽板弯曲试验,应用新的修正MK模型确定材料常数(C)和初始厚度不均度(f0)。通过提出的新模型计算得到20和200°C下的成形极限图。将板材厚度法向应力对成形极限的影响计入新模型,并嵌入Abaqus/Explicit中,进行筒形件充液成形并加以验证。结果表明:与传统MK模型对比可知,新模型预测的成形极限图与实验值更加接近;在20和200°C下,充液热成形模拟与实验之间的误差分别为8.23%和9.24%,验证了模型的有效性。
Combining the MK model with the ductile fracture criterion, a new model for predicting the forming limit of 5A06-O aluminum alloy plates under different temperatures is proposed. Based on the wide plate bending test, a new modified MK model was used to determine the material constant (C) and the initial thickness unevenness (f0). The forming limit maps at 20 and 200 ° C were calculated from the proposed new model. The effect of plate normal stress on the forming limit was taken into account in a new model and embedded in Abaqus / Explicit for cylindrical tube filling and verification. The results show that compared with the traditional MK model, the predicted value of the new model is close to the experimental one. The error between the hydroforming simulation and the experiment at 20 and 200 ° C is 8.23% and 9.24%, respectively. The validity of the model is verified.