Fasteners, Materials & Failure Analysis

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Oversized Hole
Above: SEM secondary electron image (at 8000x magnification) of a low carbon, resulfurized steel, that fractured in bending when loaded perpendicular to the rolling direction. Failure mode is ductile dimple rupture matrix; also seen here is stringer inclusions which provides local weakness. This weakness is why the dimple rupture surrounding the inclusions is much larger as opposed to regions where stringers are not observed.