Finite Element Analysis On The Fatigue Crack Growth Parameter Of High Strength Aluminum Alloy Based On The Material's Kinematic Hardening

This article to pulls through a detailed elastic-plastic finite element analysis of the effect of the compressive loading on crack tip plasticity is studied based on the material's kinematic hardening model. Finite element experimented under the pressure load which inferred for front the fatigue cracking state-of-art parameter influence for the theory and the experiment has provided the powerful finite element proof.The main work is, This article simultaneously the application elastic-plasticity finite element method established has pulled presses the load fatigue cracking expansion model of different material 2024-T351& 7049-UA in different stress rate R, in the experiment altogether establishes five to have the different length center to penetrate the crack excel in aluminum alloy board the finite element model, carried on separately pulls presses the load simulation analysis. Through this experiment, experimented under the pressure load which inferred for front the fatigue cracking state-of-art parameter influence for the theory and the experiment has provided the powerful finite element proof.The result indicated that, presses the load to have the remarkable influence to the fatigue of metal crack state-of-art parameter, as soon as under the same stress intensity factor condition, in pulls - presses the load cycle, the crack tip reverse plastic area along with presses the load the increase to increase, the crack acme opens the displacement along with to press the load to increase reduces, occurs in the cyclic loading pressure load is influential to the crack state-of-art plastic deformation, the massive plastic deformation occurs is pressing the load process, presses the load the size is the decision fatigue cracking state-of-art parameter major effect factor. We can predict the fatigue crack growth rate according the result of 7049-UA,R=-1. The theory and the finite element experiment explained together why in pulls presses under the load the crack expansion is receives the ultimate working capacity factor and the biggest pressure load influence, presses under the load the crack acme reverse plastic area fill-out, in presses under the load the crack rate of expansion to increase these phenomena.