Numerical Simulation of Low Temperature Fatigue Performance of Welded Joints of Q500QENH Weathering Steel

Le résumé fourni par la source

Weathering steel is widely used in plateau construction because of its excellent working performance in complex environment. In order to study the low temperature fatigue performance of welded joints of Q500qENH weathering steel， based on the linear elastic fracture mechanics method and the interactive use of ABAQUS and FRANC3D software， the fatigue crack propagation of V-shaped butt joint and cross shaped transmission angle welded joints at -40 ℃ were simulated. And the model was verified by comparing with low temperature fatigue experimental results. On this basis， several key factors affecting the fatigue life were analyzed. The results showed that： the initial crack size and initial crack angle mainly affected the early crack propagation pattern and the final fatigue life of the welded joints. The fatigue life was minimum when the length of the major and minor axes of the initial elliptical crack was equal， and the initial crack plane was perpendicular to the length of the specimen. The initial crack location in the lengthwise direction of angle welding surface had great influence on the fatigue life of the cross shaped transmission angle welded joints， while had little influence on the V-shaped butt joint.

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