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Abstract This paper investigates the effect of overload and misalignment on crack propagation of laser welded T-joints. The results showed that the crack growth rates of these joints are like… Click to show full abstract
Abstract This paper investigates the effect of overload and misalignment on crack propagation of laser welded T-joints. The results showed that the crack growth rates of these joints are like those of base material. For single overload, the increase of Δ K from 8.5 to 13 M P a m 1 / 2 multiplied the average retarded crack growth rate by 7.5 for R = 0.4. The highest crack retardation was caused by multiple overloads with overload ratio of 2 and interval of 10,000 cycles between overload peaks. According to fractographies, the size of plastic zone ahead of the crack tip and the crack branching governed for crack retardation.
Journal Title: International Journal of Fatigue
Year Published: 2020
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