本文基于Oyane韧性断裂准则,结合数值模拟方法,预测板料不同应变状态下的极限应变.准则中的材料参数通过单向拉伸和平面应变拉伸试验确定.在模拟胀形试验获得每一时间步应力、应变值的基础上,应用韧性断裂准则预测板料的成形极限.模拟结果表明用韧性断裂准则和数值模拟相结合的方法能成功获得板料的成形极限图.
Oyane ductile fracture criterion was introduced into numerical simulation to predict the forming limit of sheet metals. Material constants in the criterion were obtained by testing the fracture strains of uniaxial tensile and plan strain stretching. The forming limit was predicted by applying the values of stress and strain of each time step obtained from numerical simulation to the ductile fracture criterion. The results indicate that the combination of ductile fracture criterion and numerical simulation can successfully predict the forming limit diagram of sheet metals.
参考文献
| [1] | H. Takuda;K. Mori;N. Hatta .The application of some criteria for ductile fracture to the prediction of the forming limit of sheet metals[J].Journal of Materials Processing Technology,1999(1/3):116-121. |
| [2] | Fahrettin Ozturk;Daeyong Lee .Experimental and numerical analysis of out-of-plane formability test[J].Journal of Materials Processing Technology,2005(1/2):247-253. |
| [3] | Ridha Hambli;Marian Reszka .Fracture criteria identification using an inverse technique method and blanking experiment[J].International Journal of Mechanical Sciences,2002(7):1349-1361. |
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