(同濟(jì)大學(xué)汽車學(xué)院，上海 201804)
摘 要: 對5052鋁合金進(jìn)行單向拉伸試驗(yàn)，使用試驗(yàn)曲線擬合Voce模型參數(shù)。觀察拉伸試樣斷口形貌，并使用光學(xué)顯微鏡測量拉伸試樣斷口的最小厚度。結(jié)合單向拉伸仿真和試驗(yàn)結(jié)果，求解得到Cockcroft-Latham 韌性斷裂準(zhǔn)則中的材料參數(shù)。將Voce 模型和Cockcroft-Latham 韌性斷裂準(zhǔn)則引入球頭脹形仿真，并進(jìn)行試驗(yàn)對比。結(jié)果表明：采用該擬合的Voce 模型和Cockcroft-Latham韌性斷裂準(zhǔn)則預(yù)測所得零件開裂位置和裂口形狀與試驗(yàn)結(jié)果吻合，采用的基于有限元仿真與簡單試驗(yàn)相結(jié)合的材料參數(shù)反求方法具有求解方便、計(jì)算精度高的優(yōu)點(diǎn)。
關(guān)鍵字: 鋁合金；球頭脹形；韌性斷裂；數(shù)值模擬
（School of Automotive Engineering, Tongji University, Shanghai 201804, China）
Abstract:The uniaxial tensile tests were conducted on 5052 aluminum alloy and Voce model parameters were determined by fitting with the experimental curves. The fracture surface was observed and the minimum thickness of it was measured with optical microscope. The material parameter of Cockcroft-Latham ductile damage criteria was achieved through uniaxial tensile simulation and test results. voce model and Cockcroft-Latham ductile damage criterion were introduced into the numerical simulation of spherical bulging and simulation approach was employed to compare with the experimental results. The results show that the position and shape of the fracture surface simulated with Voce model and Cockcroft-Latham ductile damage criteria are in good agreement with the experimental ones. The method of material parameters identification based on finite element simulation and simple tests has high accuracy and can be applied conveniently.
Key words: aluminum alloy; spherical bulging; ductile fracture; numerical simulation
