Effect of Stop-hole Arrangement and Diameter on Crack Growth Retardation of Steel Plate under Flexural Loading
Keywords:
crack growth retardation, fatigue crack, finite element, stop-drill hole, stop-hole locationAbstract
This paper presents the effects of stop-hole arrangement and diameter (D) of a single stop-drill hole (SDH), double SDH, and crack flank holes (CFH) on the fatigue life extension of steel plate under out-of-plane flexural loading. The effect of stop-hole configurations on fatigue crack retardation was experimentally investigated on six steel plate specimens with a central through-thickness crack and a stress ratio (R) of -1. Finite element models were developed to evaluate the stress intensity factor at crack tips and the stress concentration around SDH. The experimental and analytical results showed that SDH effectively retarded the propagation of fatigue cracks under flexural loading. The finite element models considering crack surface interference provided a reasonable estimate of the stress intensity factor at crack tips and a prediction of the crack growth direction. The stress concentration around stop holes decreased with an increase in D. For the same D, CFH gave the lowest stop-hole stress concentration, which provided the longest fatigue life initiation from the drilled hole, followed by double SDH and single SDH, respectively. The CFH with a distance between the crack tip and center of the drilled holes of -0.25D provided the most significant fatigue crack retardation.
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