【摘要】：將MK模型與韌性斷裂準(zhǔn)則相結(jié)合,提出預(yù)測(cè)不同溫度下5A06-O鋁合金板材成形極限的新模型�；趯挵鍙澢囼�(yàn),應(yīng)用新的修正MK模型確定材料常數(shù)(C)和初始厚度不均度(f0)。通過提出的新模型計(jì)算得到20和200°C下的成形極限圖。將板材厚度法向應(yīng)力對(duì)成形極限的影響計(jì)入新模型,并嵌入Abaqus/Explicit中,進(jìn)行筒形件充液成形并加以驗(yàn)證。結(jié)果表明:與傳統(tǒng)MK模型對(duì)比可知,新模型預(yù)測(cè)的成形極限圖與實(shí)驗(yàn)值更加接近;在20和200°C下,充液熱成形模擬與實(shí)驗(yàn)之間的誤差分別為8.23%和9.24%,驗(yàn)證了模型的有效性。
[Abstract]:By combining the MK model with the ductile fracture criterion, a new model for predicting the forming limit of 5A06-O aluminum alloy sheet at different temperatures is proposed. Based on the wide plate bending test, a new modified MK model is used to determine the material constant (C) and the initial thickness inequality (f 0). The forming limit diagrams at 20 擄C and 200 擄C are obtained by the new model. The influence of normal stress of sheet thickness on forming limit is taken into account in the new model and embedded in Abaqus/Explicit to carry out liquid-filled forming of cylindrical parts and verify them. The results show that compared with the traditional MK model, the new model predicted the forming limit diagram is closer to the experimental value. At 20 擄C and 200 擄C, the error between the simulation and the experiment is 8.23% and 9.24% respectively, which verifies the validity of the model.
【作者單位】： 北京航空航天大學(xué)機(jī)械工程及自動(dòng)化學(xué)院;
【基金】：Project(51175024)supported by the National Natural Science Foundation of China
【分類號(hào)】：TG146.21

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本文編號(hào)：2369185