国产铝合金材料滞回本构模型研究

Study on Hysteretic Constitutive Model of Domestic Aluminum Alloy

材料的滞回本构模型是准确预测结构弹塑性地震响应的基础.为此,在国产6082-T6和7020-T6铝合金材料的循环加载试验的基础上,得到了铝合金在单调荷载和循环荷载作用下的应力-应变曲线;随后采用分段Ramberg-Osgood模型对单调拉伸曲线、循环加载曲线以及骨架曲线进行拟合,并提出了国产铝合金材料的单轴滞回本构模型.将所提出的滞回本构模型与试验结果进行对比,结果表明本文提出的滞回本构模型能够准确地描述铝合金材料在循环荷载作用下的受力性能.

The hysteretic constitutive model is used to predict the structural elasto-plastic seismic behavior of materials accurately.Chinese 6082-T6 and 7020-T6 aluminum alloy were tested under cyclic loading,and their stress-strain curves under monotonic and cyclic loading were obtained.Secondly,the expressions of monotonic tensile curves,hysteretic curves and skeleton curves were fitted based on the piecewise Ramberg-Osgood model.As a consequence,the uniaxial hysteretic constitutive model of Chinese aluminum alloy was proposed.The obtained hysteretic constitutive model was validated against the test curves,and the results showed that the uniaxial hysteretic behavior of Chinese aluminum alloy can be accurately described by the proposed model.