Fatigue life prediction for Q420qFNH weathering steel welded joints considering the effect of multiple cracks
Source abstract
Abstract
Multiple semi-elliptical cracks frequently develop at the weld toes of welded joints. These interfering multiple cracks significantly accelerate crack growth rates and reduce the fatigue life of a welded joint compared to a single crack. In this study, a method for predicting the fatigue life of a welded joint with multiple cracks, considering multiple crack interference, coalescence, and crack closure, is proposed and validated by fatigue tests on Q420qFNH weathering steel welded joints. A theoretical formula for the multiple surface crack interference amplification factor is derived using finite element method and superposition principle. The aggregation and morphological evolution during the propagation process of multiple cracks is accurately simulated, and the fatigue life of both cruciform-welded and butt-welded joints is predicted. Additionally, a quantitative analysis is conducted to assess the impact of the number of fatigue cracks on fatigue strength. The results indicate that the interference amplification effect of cracks depends on their distance and mainly affects the surface points at the crack front. The coalescence and propagation of multiple cracks significantly reduce the fatigue life of welded joints. An increase in the number of fatigue cracks leads to a notable reduction in the fatigue strength of a welded joint
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fatigue and fracture mechanics · Advanced Welding Techniques Analysis · Non-Destructive Testing Techniques
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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