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

    STP1120

    A Method for Evaluating the High Strain Rate Compressive Properties of Composite Materials

    Published: 0


      Format Pages Price  
    PDF (352K) 12 $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

    A test apparatus and method developed to obtain high strain rate compressive mechanical properties of various fiber-reinforced composite materials is described. This direct compressive method uses a drop tower to impart a load at dynamic rates to the test fixture. Uniform specimen loading is accomplished through the use of aligned guiderails to constrain all but the vertical motion of a free-sliding impactor. Specimen endcaps, specific to thick-section testing, are implemented to prevent premature brooming failure. A piezoelectric transducer and aluminum absorbers are some of the refinements introduced to allow acquisition of stress and strain data free of distortion. Strain rates on the order of 8 s-1 have been achieved, and higher rates appear possible. Material property data were obtained on a series of AS4 graphite/PEEK thermoplastic [02/90]8s composite laminates. The results of this first study indicate that at high strain rate loading, the strength of this material increases 42% over static values, while the strain to failure increases by 257#x0025;. There also appears to be a small effect of increased strain rate on the initial and secant moduli for this material.

    Keywords:

    composites, high strain rate, compressive properties, fiber-reinforced composites, loading


    Author Information:

    Montiel, DM
    engineering manager, Forensic Technologies International, Annapolis, MD

    Williams, CJ
    Materials engineer, Composites and Resins Branch of the David Taylor Research Center, Annapolis, MD


    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP20144S