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Abstract

A pair of bolts on a connecting rod failed during a test run for a prototype engine. They were replaced by bolts made from a stronger material that also failed, one due to fatigue, the other by tensile overload. The fracture surfaces on all four bolts were examined using optical and electron microscopes, indicating that the operating loads on the bolts far exceeded the design loads. Based on their observations, which are summarized in the report, failure analysts concluded that the design of the connecting rod system needs to be reassessed.

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Failure of Connecting Rod Bolts in a Ground-Based Engine, Failure Analysis of Engineering Structures: Methodology and Case Histories, By V. Ramachandran, A.C. Raghuram, R.V. Krishnan, S.K. Bhaumik, ASM International, 2005, p 185–188, https://doi.org/10.31399/asm.tb.faesmch.t51270185

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