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A turbine in a fertilizer plant began to vibrate and was shut down to investigate the problem. A first stage rotor blade was found fractured and was removed along with several other blades for further examination. Based on their observations and testing, investigators concluded that the blade cracked at the tenon due to high hardness of the base material. Vibration caused the crack to grow, leading to final failure by fatigue.

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Failure of a Rotor Blade in a Turbine in a Fertilizer Plant, 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 182–184,

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