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Abstract

A stick-shift from an automobile transmission failed in service. Failure occurred by stable fatigue crack propagation at locations R and L. Plausibly, the crack initiated at location R due to maximum tensile stress, which was perhaps further concentrated by a surface imperfection. As the crack progressed, the service load shifted to the section marked L. This overload on location L appears to have caused another fatigue crack that propagated first over the smooth-banded region. Catastrophic failure occurred when the component became unstable under the applied load.

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2019. "Failure of an Automobile Transmission Stick-Shift", ASM Failure Analysis Case Histories: Automobiles and Trucks

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