Abstract
A broken hook-shaped steel rod from a weight-lifting bridge beam was received from a plant for failure analysis. Visual, stereo, and light optical microscopy as well as hardness testing, used for fractographic, microstructural, and strength evaluation, were used as the principal analytical techniques in the investigation. Macrofractographic investigation suggests strongly that failure initiated at the weld area and was followed by torsional overload fracture of the hook body. The fracture probably originated from abnormal operation of the crane lift.
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