Numerical simulation of the tensile behavior of Al 7075-T6 alloy with corrosion pits

Corrosion which occurs at local scale has been found to result in a dramatic macroscopic tensile ductility loss of the 7075 Aluminum alloy. The aim of the present paper is to investigate the plastic property and ultimate strength characteristics of high strength Aluminum alloy with corrosion pits. The tensile behavior of corroded 7075-T6 specimens has been simulated on the basis of micromechanics analysis by taking into account the degree of corrosion pit by weight loss rate. The mathematic description of the void volume fraction evolution is modified and the parameters in the modified model were obtained according to the tensile test results of uncorroded material. Ductile fracture behavior of the specimens with different corrosion time was analyzed by using the modified Gurson model. The results of numerical simulation agree well with experimental data. The insights developed from the present study will be very useful for damage tolerant design of Aluminum alloy structures with pit corrosion damage.