Ding Fengjuan, Hong Tengjiao, Xu Youlin, Jia Xiangdong
College of Mechanical Engineering, Anhui Science and Technology University, Bengbu 233100, China.
College of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China.
Materials (Basel). 2022 Apr 29;15(9):3212. doi: 10.3390/ma15093212.
To determine the Gurson-Tvergaard-Needleman (GTN)damage model parameters of 6061 aluminum alloy after secondary heat treatment, the uniaxial tensile test was carried out on the aluminum alloy circular arc specimen, and the mechanical properties parameters and the load-displacement curve of aluminum alloy tube were obtained. With the help of the finite element reverse method, scanning electron microscope and a orthogonal test method, the GTN damage model parameters (, , , and ) were calibrated, and their values were 0.004535, 0.04, 0.1, and 0.2135, respectively. Then the shear specimen and notch specimen were designed to verify the damage model, the results show that the obtained GTN damage model parameters can effectively predict the fracture failure of 6061 aluminum alloy after secondary heat treatment during the tensile process.
为确定二次热处理后6061铝合金的古尔松-特弗加德-尼德曼（GTN）损伤模型参数，对铝合金圆弧试样进行了单轴拉伸试验，得到了铝合金管的力学性能参数和载荷-位移曲线。借助有限元逆向法、扫描电子显微镜和正交试验法，对GTN损伤模型参数（、、、）进行了校准，其值分别为0.004535、0.04、0.1和0.2135。然后设计剪切试样和缺口试样对损伤模型进行验证，结果表明，所获得的GTN损伤模型参数能够有效预测二次热处理后6061铝合金在拉伸过程中的断裂失效。
