The Research Of Non-local Strain Method In The Structure Fatigue Damage Numerical Simulation

The fatigue damage mechanism of the metallic material and the traditional computation fatigue failure method are summarized in this paper,the construction relations of the metallic material fatigue damage is elaborated systematically.Based on the analytical study of classical local strain damage model,the non-local enhancement gradient damage model is inferred.When the material microscopic criterion factor and the material damage criterion have been considered,this model is more reasonable to the material actual effect analysis and conforms to the actual operating mode.When the discretion of the equilibrium equations with metallic damage parameter is discussed in this paper,the finite element numerical simulation implementation is introduced.The contained the gap tension specimen is taken as the example to carry on the numerical simulation computation,obtained metallic material fatigue life rule under constant-amplitude load function.The classics separately the Paris formula and the non-local enhancement gradient damage model have been used to calculate fatigue life under constant-amplitude stress spectrum with this specimen and analysis its result.In the final,we has obtained the feasibility of carrying on the metallic material damage numerical simulation with the non-partial enhancement gradient damage model...