Abstract
In general, distortion has significant effects on the assembly process of welded structures and remarkable influences on the strength of the welds. Therefore, this work focuses on the effect of angular welding distortion on fatigue strength to improve transferability of specimen results to components. Experimental investigations cover manufacturing and fatigue testing of three single-sided transversal stiffeners series exhibiting different angular distortions. The fatigue test results of as-welded specimen show a distinct link between fatigue performance and initial angular distortion. However, in case of a high frequency mechanical impact (HFMI)-treated weld toe, the fatigue strength increases up to base material level and is independent of the distortion. A comprehensive numerical analysis reveals a complex interaction between the applied nominal load, initial specimen distortion and the local stress field. In this context, an engineering-feasible assessment is derived to estimate the local effective stresses featuring the acting local stress range as well as the stress ratio. The application of this distortion factor enables the set-up of a uniform S/N-curve with a significantly reduced scatter band.
Highlights
Distortion in welded components is a result of the thermal heat-input during welding [1,2] and its mechanical restraints [3,4]
The combined statistical evaluation shows reduced for. This leads to coinciding fatigue test results for both, structural and effective notch stress aevaluation scatter which is well comparable to a single distortion state
An additional consideration of the actual local stress ratio based on the IIW-recommendations which is well comparable to a single distortion state
Summary
Distortion in welded components is a result of the thermal heat-input during welding [1,2] and its mechanical restraints [3,4]. Phase transformations affect the distortion by changes of the inherent strain state within the heat-affected zone [5]. The distorted state of the joints affects the assembling process of welded structures and has remarkable influence on the strength of the weld [6,7,8]. Numerous recent publications deal with the estimation of welding distortion using transient thermo-mechanical simulation techniques or inherent strain methods [9,10,11]. The numerical results revealed that phase transformations significantly affect the final state of distortion. A prediction of the welding distortion based on local displacement in the weld plastic zone by utilizing the inherent strain method was given in [13]
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