The Influence of Humid Environment on Fatigue Property of Pre-Corroded 7XXX Aluminum Alloy

Abstract

The influence of humid environment on fatigue property of pre-corroded 7XXX aluminum alloy were investigated by means of fatigue and staircase experiments (Kt=1 and Kt=3). The results showed that humid environment significantly reduces both fatigue life and strength with the influence-factor of 0.7339(Kt=1), 0.8603(Kt=3) and 0.973(Kt=1), 0.971(Kt=3), respectively. The humid environment enlarges the dispersivity of fatigue life. As a consequence, an unconservative results on prediction of the fatigue life with high reliability of 99.9% will be obtained, based on the corrosion-influence-factor reached from eigenvalue or mean value .

The fatigue crack behavior of 7N01-T6 aluminum alloy in different particle environments

“…(2) Relative humidity (RH): the FCGRs of aluminium alloys usually increase with rising RH [14]. Hui et al [15] demonstrated that an approximate 10% decline in fatigue strength was caused by the increase of RH from 50 to 90%. Murakami et al [14] found that, in humid environments, the fresh fracture surface of aluminium alloys can react with the vapour in the air to produce hydrogen which diffuses into the matrix of crack tip and thus induces hydrogen embrittlement [16].…”