点蚀损伤7075-T6铝合金弹性性能计算模型的理论与实验研究

 点蚀坑是高强度铝合金材料中广泛存在的一种腐蚀形式，这种点蚀损伤会导致材料性能的下降，严重地威胁着结构的承载能力。根据点蚀损伤的特点，在细观力学的理论基础上，建立了点蚀损伤材料弹性性能计算的孔隙率模型。使用7075-T6铝合金，在连续酸性盐雾环境下进行预腐蚀。根据预腐蚀件的拉伸实验结果，对模型的正确性进行验证。模型计算与实验结果的对比证明了本文方法的可行性与正确性。

Theoretical and Experimental Research for the Elastic Properties of Corroded 7075-T6 Al Alloy

The researches were aimed at assessing the elastic properties of material with pre-existing corrosion damage.Corrosion in the form of pitting in certain classes of aluminum alloys,e.g.7075-T6,is considered here.Based on the characteristics of corrosion metrics and micromechanics,the paper describes a mechanical property prediction procedure for corroded aluminum alloy.The model was developed in the framework of micro-mechanics,in combination with the existing corroded coupon tensile test results.The existing data included the weight loss rates of 7075-T6 sheet exposed to acid salt spray(fog)for various time periods.Tensile tests were taken for corroded "dog bone" coupons.The paper describes the test procedures and mechanical test results.The results provide a database for verifying the analysis model.The accuracy of the method is assessed by comparing the predicted results with those of tests of corroded 7075-T6 specimens.The results indicate that corrosion can be represented by voids damage in the material as the elastic properties of corroded aluminum alloy are concerned.