Figure F20. Geometrical and structural features observed in the bit sub failure and in the cracked pipe. A. Details from the unrolled image of the 5 inch pipe failure; stretched fibers on the left and stepped morphology of the crack on the right. B. Details from the unrolled image of the bit sub failure; primary hackly fringe inside the crack displays the overall direction of fracture propagation. Overlapping pieces and deformed fibers provide evidence for an overprinting event.
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