Virtual corrosion fatigue crack propagation tests

The fatigue crack propagation behavior of LY12CZ aluminum alloy fastener with a central hole has been investigated in 3. 5%NaCl solution. Based on the experimental results,the virtual corrosion fatigue crack propagation tests were proposed. Two virtual crack propagation methods of stochastic processes and AFGROW simulation were discussed. The parameters of Paris equation were obtained by numerical fitting method. The normal process and lognormal process were considered for the stochastic process method. The stochastic crack length distributions and the probabilistic model of crack length distributions at given cycles were presented. Using the AFGROW software,the virtual simulation was carried out to analyze corrosion fatigue crack growth behavior. The predicted curves were in good agreement with experimental results.