【摘要】 铝合金材料本构关系是铝合金结构分析和应用的基本问题之一,针对国产高强新牌号铝合金6082-T6的材料本构模型进行研究。对取自3种截面形式结构用6082-T6高强铝合金型材的90个材性试样进行了拉伸试验,统计规定非比例延伸强度、抗拉强度、弹性模量、断裂伸长率、泊松比等材料力学参数。分析Ramberg-Osgood本构模型中硬化指数n的各种计算方法,提出采用快速退火算法(fast simulated annealing,FSA)求解n的方法并且编制计算程序,从而获得n的置信区间,所得结果比传统两点法更稳定。在此基础上得到了国产6082-T6高强铝合金材料本构模型,与试验实测应力-应变曲线的比较表明,提出的本构模型具有很好的预测性,可为铝合金结构的工程应用提供参考。更多还原

【Abstract】 Material constitutive relationship is one of the basic problems for analysis and application of aluminum alloy structures.This paper systematically studied the material constitutive model of the domestic high-strength new grade aluminum alloy 6082-T6.Tensile testing was conducted for a total of 90 coupons that were cut from three cross-section shapes of the aluminum alloy 6082-T6.The measurement and statistical analysis of mechanical parameters were carried out,including non-proportional extension strengths,tensile strength,elastic modulus,breaking elongation,Poisson’s ratio,etc.Various methods for calculating hardening exponent n in the Ramberg-Osgood law were discussed.The fast simulated annealing(FSA) method for calculating n was proposed and the FSA code was written to obtain the confidence interval of n.Comparison of results between FSA and other methods indicates that the FSA can provide more stable results than the traditional two-point method.On this basis,the material constitutive model of the 6082-T6 aluminum alloy was obtained.The comparison of this model and the tested stress-strain curve demonstrates that the constitutive model has good accuracy and can be applied to the engineering applications of aluminum structures.更多还原