两种结构用铝合金循环加载试验研究

铝合金材料的滞回性能是研究铝合金结构抗震性能的基础.针对国产6082-T6和7020-T6铝合金,采用等幅升幅、等幅交替和循环拉伸3种不同的加载制度进行循环加载试验,最大应变控制在±4%.试验采用标距与直径比为1.5的小标距试件防止其在循环加载时发生受压失稳.小标距试件和标准试件的单调拉伸结果对比表明,在4%的应变范围内,小标距试件和标准试件的试验结果相差很小,因此采用小标距试件进行循环加载试验是可行的.通过循环加载试验获得了铝合金材料的应力-应变关系及滞回特性.试验结果显示,铝合金材料有良好的滞回性能和延性,加载方式对其骨架曲线有一定影响.

Cyclic Loading Tests of Two Types of Structural Aluminum Alloy

The hysteretic behavior of aluminum alloy is fundamental for studying the seismic behavior of aluminum alloy structures. A total of three different loading protocols, including cyclic ascending, cyclic alternating and cyclic tensile, with the maximum strain amplitude up to ±4%, were adopted for the 6082-T6 and 7020-T6. In order to avoid buckling, the small gauge specimen with length-to-diameter ratio of 1.5 was adopted. The comparison of monotonous tensile results between the small gauge specimen and standard specimen revealed that the error of the two specimens was very small, which indicated the feasibility of the adoption of the small gauge specimens. The stress-strain relationship and hysteretic behavior of aluminum alloy were also obtained by cyclic loading test. The obtained results show that the aluminum alloy has good hysteretic behavior and ductility, and the load protocol influences its skeleton curve to a certain extent.