This paper presents a new method to evaluate the stress intensity factor at the deepest position for welded plate joints with semi-elliptical surface crack in tension, based on maximum crack opening displacement (MCOD) of surface crack. T-butt plate joints are chosen as research objects, and series of values of MCOD and stress intensity factor (SIF) at the deepest point are obtained by finite element method. Subsequently, by the proposed method to calculate SIF by MCOD for the surface cracked finite plate model and various parametric effects analysis, the explicit expression of weld toe magnification factor (MK) is acquired by surface fitting. So, the simple method to calculate SIF at the deepest point enable to be realized when the MCOD is known. And then, this method is demonstrated to be suitable for any form of plate joints.

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