(哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001)
摘 要: 為了準(zhǔn)確地預(yù)測鋁合金板材成形極限， 將韌性斷裂準(zhǔn)則引入到數(shù)值模擬中。 在數(shù)值模擬獲得的應(yīng)力應(yīng)變值基礎(chǔ)上， 采用簡單拉伸試驗和數(shù)值模擬相結(jié)合的方法確定了韌性斷裂準(zhǔn)則中的材料常數(shù)，并應(yīng)用該韌性斷裂準(zhǔn)則預(yù)測了鋁合金LY12（M）的圓筒件拉深和半球形凸模脹形的成形極限。 預(yù)測結(jié)果與實驗值吻合較好， 該韌性斷裂準(zhǔn)則能夠預(yù)測鋁合金板材成形極限。
關(guān)鍵字: 板材成形； 韌性斷裂準(zhǔn)則； 數(shù)值模擬； 成形極限
（School of Materials Science and Engineering,
Harbin Institute of Technology,Harbin 150001, China）
Abstract: To accurately predict the forming limit in aluminum alloy sheet forming, ductile fracture criterion is introduced into numerical simulation. On the basis of the values of stress and strain calculated from numerical simulations, the material constants in ductile fracture criterion were determined by the combination of tension tests with numerical simulation, and the forming limits in cylindrical deep drawing and hemispheric punch bulging of aluminum alloy sheet LY12(M) were predicted. The experiments verify that the predicted results are in agreement with the experimental ones, and that the ductile fracture cristerion can predict the forming limit of aluminum alloy sheet.
Key words: sheet forming; ductile fracture criterion; numerical simulation; forming limit
