Abstract
“U” bolts used in heavy trucks are designed to fasten and restrain leaf springs to the axles. Longitudinal cracks were discovered in the threaded region of a few “U” bolts and subsequent analysis determined that a steel composition had been used that was susceptible to quench cracking. A heavy decarburized surface layer added to the susceptibility to quench cracking due to unfavorable residual stresses that developed as a result of rapid cooling during the quenching process. The implications of the longitudinal cracks and how they affect the required clamp load and potential failure of leaf springs is discussed.
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