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    Structured Approach to Material Testing Ensures Reliable Introduction of New Technologies: Advances in Rolling Contact Fatigue Strength Testing and Related Substitute Technologies

    Published: 01 August 2012

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    Development, evaluation, and validation of new material technologies appropriate for the aerospace industry demand a structured, rigorous approach. Only through this approach can new material technologies be confidently and safely introduced into critical applications. Characterizing materials through component testing is an appropriate first step. Successful results can justify further evaluation through subscale testing that can be accomplished with standardized basic test rigs. Basic testing of this nature can establish strong statistical evidence based on established baselines. Full scale testing in more sophisticated test rigs or full scale engines can then serve to confirm material advantages in actual operating environments. This structured approach demonstrates the advantages achieved by combining Duplex hardened M50 rings with silicon nitride (ceramic) balls. Results from testing of these materials through these steps will demonstrate how this approach can be used to ensure flight safety. Specific details regarding these tests are presented herein. Favorable results warranted completion of the entire recommended test protocol. Full scale findings with simulated contamination conditions demonstrate a thirty times life improvement achieved through the combination of these proven material technologies. The structured test protocol described helps to ensure the reliability of the concluded benefits.


    duplex hardening, silicon nitride, fatigue life testing, aerospace bearing materials, contamination

    Author Information:

    Streit, Edgar
    Product Development Aerospace, FAG Aerospace GmbH & Co. KG, Schweinfurt,

    Mirring, Patrick
    Product Development Aerospace, FAG Aerospace GmbH & Co. KG, Schweinfurt,

    Brock, Joe
    The Barden Corporation, Danbury, CT

    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP104602