The numerical high cycle fatigue damage model of fillet weld joint under weld-induced residual stresses

2nd International Conference on Sustainable Development in Civil, Urban and Transportation Engineering

地球科学;运输工程;经济学

Van Do, Vuong Nguyen^1

Faculty of Civil Engineering, Ton Duc Thang University, HCMC, 19 Nguyen Huu Tho St. Dist. 7, 700000, Viet Nam^1

关键词: Cyclic plasticity;    Fatigue crack initiation;    High cycle fatigue damages;    Multiaxial high-cycle fatigue;    Thermo-mechanical;    Threedimensional (3-d);    Welded structures;    Welding residual stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/143/1/012037/pdf
DOI  :  10.1088/1755-1315/143/1/012037

来源: IOP

【 摘 要 】

In this study, a development of nonlinear continuum damage mechanics (CDM) model for multiaxial high cycle fatigue is proposed in which the cyclic plasticity constitutive model has been incorporated in the finite element (FE) framework. T-joint FE simulation of fillet welding is implemented to characterize sequentially coupled three-dimensional (3-D) of thermo-mechanical FE formulation and simulate the welding residual stresses. The high cycle fatigue damage model is then taken account into the fillet weld joints under the various cyclic fatigue load types to calculate the fatigue life considering the residual stresses. The fatigue crack initiation and the propagation in the present model estimated for the total fatigue is compared with the experimental results. The FE results illustrated that the proposed high cycle fatigue damage model in this study could become a powerful tool to effectively predict the fatigue life of the welds. Parametric studies in this work are also demonstrated that the welding residual stresses cannot be ignored in the computation of the fatigue life of welded structures.