韧脆转变区夏比冲击试验的数值模拟研究  

The Numerical Investigation of Charpy Impact Test in Ductile-to-Brittle Transition Region

作　　者：曹昱澎[1,2] 惠虎[1] 贺寅彪[2] 李辉[2] 

机构地区：[1]华东理工大学机械与动力工程学院承压系统安全科学教育部重点实验室 [2]上海核工程研究设计院工程设备所

出　　处：《化工机械》2014年第2期215-219,共5页Chemical Engineering & Machinery

摘　　要：对16MnR钢在韧脆转变区进行了夏比冲击试验,利用有限元分析软件ABAQUS考虑了冲击过程中高应变率对基体材料的强化效应,并耦合延性损伤GTN模型对转变区的夏比冲击试验进行了数值模拟研究。对比试样断面上的延性裂纹扩展长度发现,GTN模型的预测结果是可接受的。通过有限元模拟获得了试样在冲击过程中各时刻的力学场,研究了在延性裂纹扩展过程中裂纹尖端应力应变场的变化规律和应变率分布规律。模拟分离得到夏比冲击功AKV包含的各部分能量,发现在冲击过程中塑性功消耗占绝大部分。Charpy impact test of 16MnR steel was carried out in ductile-to-brittle transition( DBT) region and ABAQUS was used to consider high strain rate effect on the basis material's tensile property; and the ductile damage's GTN model was coupled to investigate Charpy impact test in DBT region. Compared to the fracture surfaces of Charpy specimens shows that the crack length predicted with GTN model can be acceptable. The stress-strain field and the distribution of strain rate ahead of the notch were obtained,including analysis of both change rule of the crack tip's stress-strain field and the stress distribution. Simulating AKVshow that the plastic deformation energy constitutes most of Charpy energy.

关 键 词：16MNR钢 夏比冲击 GTN模型 延性断裂 

分 类 号：TQ050.41[化学工程]