国产结构用7020-T6铝合金高低温力学性能试验研究  

Experimental Study on the Mechanical Property of Structural 7020-T6 Aluminum Alloy at Low and Elevated Temperatures

作　　者：郭小农[1] 陶磊 王丽[1] 梁水平[1] GUO Xiaonong;TAO Lei;WANG Li;LIANG Shuiping(College of Civil Engineering,Tongji University*Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院

出　　处：《建筑钢结构进展》2019年第6期1-8,共8页Progress in Steel Building Structures

基　　金：国家自然科学基金(51478335)

摘　　要：铝合金材料在高温条件下力学性能会降低,而在低温条件下强度和韧性却会增加。目前国内外关于结构用铝合金在极端温度条件下(尤其是低温下)力学性能的研究较少。为弥补当前研究的不足,完成了国产结构用7020-T6铝合金的高、低温拉伸试验,试验温度为-120℃、-100℃、-50℃、-20℃、0℃、20℃、100℃、150℃、200℃、250℃、300℃。通过试验得到了7020-T6铝合金在不同温度下的抗拉极限强度、名义屈服强度、弹性模量、断后延伸率和断面收缩率等力学性能参数;最后对试验数据进行回归分析,拟合得到了其抗拉极限强度和名义屈服强度随温度变化的计算公式。The mechanical property of aluminum alloy degrades at elevated temperature,whereas the ultimate strength increases and ductility improves at low temperature.The study on mechanical property of structural aluminum alloy at extreme temperature particularly at low temperature is limited.In this paper,tensile tests are conducted to investigate the influence of extreme temperature on aluminum alloy for 7020-T6 Al-alloy produced in China.The testing temperatures are set as-120 ℃、-100 ℃、-50 ℃、-20 ℃、0 ℃、20 ℃、100 ℃、150 ℃、200 ℃、250 ℃、300 ℃.The tensile strength,nominal yield strength,elastic modulus,elongation ratio and section shrinkage ratio are obtained from the test data.Formulas of ultimate tensile strength and nominal yield strength for the relationship between temperature and mechanical behavior are proposed.

关 键 词：铝合金 高温 低温 力学性能 拉伸试验 

分 类 号：TU512.4[建筑科学—建筑技术科学]