摘要
为探究7A52铝合金的流动应力变化规律,在材料拉伸试验数据基础上,建立Johnson-Cook本构模型。利用有限元软件AQAQUS,模拟7A52铝合金在温度为25~400℃、应变率为0.1~10 000 s^(-1)的准静态和动态拉伸试验。结果表明:温度和应变率都会影响7A52铝合金的流动应力,但对温度的敏感性较大,对应变率敏感性较小;流动应力随着温度的升高而减小;流动应力随着应变率的增加而增大,尤其在应变率高于1 000 s^(-1)时影响更加明显。所建有限元模型结果与试验结果吻合较好,证明该Johnson-Cook本构模型能够在一定温度和应变率范围内预测7A52铝合金的流动应力。
To investigate the flow stress characteristics of 7A52 aluminum alloy,Johnson-Cook constitutive model was established on the basis of data from tensile tests.Quasi-static and dynamic tensile of 7A52 aluminum alloy during the temperature range of 25-400 ℃ and strain rate range of 0.1-10 000 s^（-1） were simulated based on finite element software AQAQUS.The results indicate that the flow stress of 7A52 aluminum alloy is strongly sensitive to temperature compared with strain rate,the flow stress reduces with the increase of temperature and increases with the increase of strain rate,especially for the strain rate higher than 1 000 s^（-1）.Good agreement between the finite element model predictions and experimental results is obtained.The Johnson-Cook constitutive model can predict the flow stress of 7A52 aluminum alloy in a certain range of temperatures and strain rate.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2018年第1期30-33,共4页
Ordnance Material Science and Engineering
基金
国家自然科学基金(50765003
51165026)
内蒙古自治区自然科学基金(2017MS0502)
内蒙古自治区高等学校科学研究项目(NJZY087)
