A horizontal hinge pin (HHP) assembly from an army cargo helicopter was examined to determine the root cause of ring and roller spalling and fracture. Chemical analyses, metallography and hardness testing indicated that the rings and rollers conformed to the material requirements of the governing drawing. Metallography and visual and scanning electron microscopy indicated the failure likely initiated in the lag ring due to rolling contact fatigue (RCF) because of high service loads. Evidence of subsurface crack initiation was observed.


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    Title :

    Failure analysis of a horizontal hinge pin from an army cargo helicopter


    Additional title:

    Fehleranalyse eines horizontalen Gelenkbolzens aus einem Armee-Lasthubschrauber


    Contributors:
    Pepi, Marc (author) / Wechsler, Gary (author)

    Published in:

    Publication date :

    2008


    Size :

    9 Seiten, 10 Bilder, 1 Tabelle, 9 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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