Numerical Simulation On The Relief Of Welding Re-Sidual Stress With Explosive Treatment

Offshore structures working in the cases of adverse marine environment, often asso-ciative impacted by the environmental loads of the wind, wave, and currants, which makehigh stress region of tubular become dangerous, and then trigger fatigue cracks, graduallypropagating, finally, whole structures collapse. There are fatigue cracks and the residualstresses characters of binding welding, thick plate multi-pass welding and annular weldingin tubular joint, which seriously depress the structural strength, stability, and stiffnessproperties, leading to occur buckling, stress corrosion cracking, fracture, and other seriousconsequences. In order to safeguard the security and integrity of structures, it is necessarythat assess the fatigue life of structures and eliminate residual stresses of tubular.From the welding residual stresses generation and distribution, the mechanism of ex-plosive treatment relieving residual stresses, the influences of explosion treatment on theproperties of material, explosive technology eliminating welding residual stress and so on.Review the progress and status of the explosion elimination welding residual stress. Projectthe main research contents: Distributed welding residual stress what is measured by theblind-hole method into the FEA model, we use nonlinear finite element software ABAQUSfor the numerical simulation on the relief of welding residual stress through an explosivetreatment, and also investigate the cracks in the weld bead of the response to the explosion.Optimize and design on explosive technology eliminating welding residual stresses. Pro-pose an engineering methodology for estimating stress intensity factor (K) solutions forweld toe through cracks in tubular T-joints, which is the foundation of residual strengthanalysis. Through compare different results, come to the optimization process, meanwhile,evaluate the impossible and necessity of explosive treatment relieving residual stresses.Design the method of explosive treatment relieving residual stress in the annular weld jointof tubular, analysis the effect of explosive treatment relieving residual stresses, which isrelevant to two modes rely on different distribution of dynamites. Result show that explo-sive treatment can effectively eliminate and homogenize residual stress. The method of ex- plosive treatment technology relieving residual stress has a wide range of applications inthe field of construction on offshore tubular.