国产结构用铝合金高温力学性能试验研究

为了研究铝合金材料在高温下的力学性能，完成了国产结构用铝合金6082-T6、6N01-T6、6061-T4和6061-T6的高温下恒温加载试验.试验测得了4种牌号铝合金在不同温度下（20 ~ 300 ℃）的力学性能，包括名义屈服强度、极限强度和延伸率等力学性能指标.然而在试验中发现高温下材料应变难以准确测量，因此未能获得各牌号铝合金高温下的弹性模量.将试验数据进行拟合，得到了4种牌号铝合金力学性能指标高温折减系数的计算式，为铝合金结构的抗火性能研究打下基础.此外，还将所得到的折减系数计算式与欧洲规范和美国规范中的建议值进行对比，结果表明规范建议值均偏安全，其中美国规范最为保守.
In order to investigate the elevated-temperature mechanical behavior of aluminum alloy, tensile tests of domestic structural aluminum alloy 6082-T6，6N01-T6，6061-T4，6061-T6 under constant elevated temperatures were carried out, and their mechanical properties under various temperatures（20 ~ 300 ℃） were obtained, including the nominal yield strength, ultimate strength and elongation. It was found that the strain of aluminum alloy specimens at elevated temperature could hardly be accurately measured, leading that their elastic modulus was not obtained. The formulae of reduction factors on the mechanical properties of the 4 kinds of aluminum alloy at elevated temperatures were derived through numerical fitting method, laying a solid foundation of the research on fire resistance of aluminum alloy structures. Moreover, the theoretical formulae were compared with the reduction factors suggested by Eurocode and American Standard. The results revealed that the codes inclined to the safe side, and the American Standard was more conservative.