摘要
根据圆锥滚子热斜轧成形过程中的特点以及轧件的受力状态分析,改进了传统的Lemaitre损伤模型,充分考虑了正、负静水压应力状态下损伤演化的差异性,以及应变速率和变形温度变化对损伤演化的影响。将改进的Lemaitre损伤模型借助SIMUFACT平台的二次开发技术嵌入到圆锥滚子孔型斜轧有限元模型中,创建了圆锥滚子孔型斜轧的损伤预测模型。同时,采用同样的建模技术建立了轴承钢球孔型斜轧损伤预测模型,并与文献中的实验结果对比,验证了改进的Lemaitre损伤模型的可靠性。圆锥滚子孔型斜轧损伤预测模型的模拟结果表明,圆锥滚子热斜轧过程中损伤程度较大的区域主要为连接颈轴心及靠近连接颈轴心的区域,而且滚子小端心部损伤程度明显大于滚子大端。
According to the characteristics of tapered roller in the helical rolling process and the analysis of stress state,a traditional Lemaitre damage model was improved by considering the difference of damage growth under positive and negative hydrostatic pressure stress state and the influences of strain rate and deformation temperature on damage growth. Then,the modified model was implemented in the FE model of helical rolling for tapered roller by the secondary development technology of SIMUFACT,and the damage prediction model of helical rolling for tapered roller was established. At the same time,the damage prediction model of helical rolling for bearing steel ball was also set up by the above technology,and the experimental results were compared with literatures to verify the reliability of modified Lemaitre damage model. The simulation results show that the large damage zones are located in the axial centre of connecting neck and near the axial centre of connecting neck in the helical rolling process of tapered roller,and the central damage in small end of tapered roller is larger than that in big end.
作者
马明辉
钱东升
曹强
邓加东
Ma Minghui Qian Dongsheng Cao Qiang Deng Jiadong(School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China Hubei Key Laboratory of Advanced Technology of Automotive Parts, Wuhan 430070, China School of Automotive Engineering, Wuhan University of Technology, Wuhan 430070, China)
出处
《锻压技术》
CAS
CSCD
北大核心
2017年第4期123-130,共8页
Forging & Stamping Technology
基金
教育部创新团队发展计划项目(IRT13087)
湖北省高端人才引领计划项目(2012-86)
湖北省重大科技创新计划项目(2015AAA005)
