The effect of residual stresses on fatigue of butt joints

摘要: In this paper, a theoretical analysis of the effect residual stresses on fatigue behavior welded butt joints was developed by using linear elastic fracture mechanics (LEFM), superposition principle and finite element approaches. Various configurations in were considered corresponding stress intensity factors calculated Bueckner`s Kanazawa`s weight functions for an edge central through-thickness crack plate, respectively. Newman-Raju`s empirical equation also used surface cracks. Fatigue life joint welds subjected to various stress-induced treatments Paris`s law with effective range factor zero-to-tensile loading (R = 0) compared available experimental data. It found that low level compressive (less than 62 MPa) terms strength improvement is same order as postweld thermal relieving process. The contribution hardness treated material obvious at high stresses.