Failure Analysis of a Fractured Hook-Shaped Steel Rod from a Lifting Weight Bridge Beam
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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.
KeywordsSteel hook-shaped rod Torsional overload Macrofractography Weld defects Ferrite-pearlite steel
The author wishes to express special thanks to Mr. A. Vazdirvanidis for the fruitful technical discussion and Mr. A. Rikos and Mr. A. Toulfatzis for their valuable contribution to the completion of the experimental work.