首页|Influence of ultrasonic impact treatment on fatigue performance of novel double-sided full penetration U-rib welded joints
Influence of ultrasonic impact treatment on fatigue performance of novel double-sided full penetration U-rib welded joints
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NETL
NSTL
Elsevier
Ultrasonic Impact Treatment (UIT) is a well-established post-weld treatment technique known for enhancing fatigue resistance of welded joints by reducing stress concentrations and welding residual stresses (WRS). However, its effect on fatigue performance of novel double-sided full penetration U-rib welded joints in orthotropic steel decks remains inadequately explored. In this study, UIT and fatigue tests were conducted on singleand double-sided full penetration U-rib joints with varying deck thicknesses. Finite element modeling was employed to simulate the welding and UIT processes, enabling the calculation of the amplitude and distribution of WRS. Subsequently, the FRANC3D and ABAQUS software were coupled to integrate WRS with cyclic loading for crack propagation and fatigue life assessment. The results reveal that UIT significantly reduces residual tensile stresses, with a more pronounced reduction in longitudinal residual stresses compared to transverse ones. UIT changes the location of crack initiation in U-rib welded joints, causing the crack initiation position to shift from the outer weld toe to the inner weld toe or root. Numerical results of crack propagation path and fatigue life align closely with experimental results, validating the reliability of the numerical model. Furthermore, UIT markedly extends the fatigue life of U-rib welded joints, with fatigue life improvements ranging from 1.5 to 2.6 times for double-sided full penetration U-rib joints and from 11.0 to 14.0 times for single-sided U-rib joints.
Welded jointsWelding residual stressUltrasonic impact treatmentCrack propagationFatigue life assessmentRESIDUAL-STRESSESSIMULATION
NETL
NSTL
Elsevier
