ABSTRACT
Based on the finite element software ABAQUS, 135 non-planar oblique butt joint finite element models were established by considering different in-plane oblique angles and out-of-plane angles, aspect ratios, and stress ratios to investigate the equivalent structural stress concentration factor (ESSCF). The results show that the maximum ESSCF value only occurs at the obtuse angle point (hot point A1) of the weld toe on the concave side near the loading end and the obtuse angle point (hot point D1) on the convex side of the weld toe near the constraint end. As the out-of-plane angle increases, ESSCF at both points continues to grow at a nearly constant the in-plane oblique angle increases, the growth rate of ESSCF at hot point A1 gradually decreases, but the trend of ESSCF value change may increase or decrease; the change rate at hot point D1 remains almost constant, and the overall ESSCF decreases with an increase in in-plane inclination. As the stress ratio increases, ESSCF at hot point A1 continues to grow at a decreasing rate, while ESSCF at hot point D1 decreases at a decreasing rate. As the aspect ratio increases, ESSCF at hot point A1 continues to grow at an increasing rate, while ESSCF at hot point D1 decreases at an increasing rate. At the same time, the location of the maximum value tends to shift from hot point D1 to hot point A1 as the in-plane oblique angles, stress ratio, and aspect ratio increase but do not vary with changes in the out-of-plane angle. Finally, based on the ESSCF extraction results, formulas for calculating ESSCF at hot points A1 and D1 were obtained by LM-UGO fitting.
