You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    STP1120

    Thermomechanical Testing of High-Temperature Composites: Thermomechanical Fatigue (TMF) Behavior of SiC(SCS-6)/Ti-15-3

    Published: 0


      Format Pages Price  
    PDF (484K) 17 $25   ADD TO CART
    Complete Source PDF (11M) 456 $115   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word


    Abstract

    Thermomechanical testing techniques recently developed for monolithic structural alloys were successfully extended to continuous fiber-reinforced composite materials in plate form. The success of this adaptation was verified on a model metal-matrix composite (MMC) material, namely SiC(SCS-6)/Ti-15V-3Cr-3Al-3Sn. The effects of heating system type and specimen preparation are also addressed. Cyclic lives determined under full thermomechanical conditions were shown to be significantly reduced from those obtained under comparable isothermal and in-phase bithermal conditions. Fractography and metallography studies of specimens subjected to isothermal, out-of-phase, and in-phase conditions revealed distinct differences in damage/failure modes. Isothermal metallography revealed extensive matrix cracking associated with fiber damage throughout the entire cross section of the specimen. Out-of-phase metallography revealed extensive matrix damage associated with minimal (if any) fiber cracking. However, the damage was located exclusively at surface and near-surface locations. In-phase conditions produced extensive fiber cracking throughout the entire cross section, associated with minimal (if any) matrix damage.

    Keywords:

    metal-matrix composites, thermomechanical testing, cyclic fatigue, SiC(SCS-6)/Ti-15-3, failure mode, fractography, heating effects, specimen preparation


    Author Information:

    Castelli, MG
    Structures research engineer, Sverdrup Technology, Inc., NASA LeRC Group, Brook Park, OH

    Bartolotta, P
    Aerospace engineer and deputy manager, Fatigue and Fracture BranchNASA Lewis Research Ctr., Cleveland, OH

    Ellis, JR
    Aerospace engineer and deputy manager, Fatigue and Fracture BranchNASA Lewis Research Ctr., Cleveland, OH


    Committee/Subcommittee: D30.05

    DOI: 10.1520/STP20146S