STP893: Dynamic Stress Analysis of Smooth and Notched Fiber Composite Flexural Specimens

    Murthy, PLN
    NRC-NASA research associate and structures/composites engineer, National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH

    Chamis, CC
    NRC-NASA research associate and structures/composites engineer, National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH

    Pages: 24    Published: Jan 1986


    Abstract

    A detailed analysis of the dynamic stress field in smooth and notched fiber composite (Charpy-type) specimens is reported in this paper. The analysis is performed with the aid of the direct transient response analysis solution sequence of MSC/NASTRAN. Three unidirectional composites were chosen for the study. They are S-glass/epoxy, Kevlar/epoxy, and T-300/epoxy composite systems. The specimens are subjected to an impact load that is modeled as a triangular impulse with a maximum of 8960 N (2000 lb) and a duration of 1 ms. The results are compared with those of static analysis of the specimens subjected to a peak load of 8960 N (2000 lb). For the geometry and type of materials studied, the static analysis results gave close conservative estimates for the dynamic stresses.

    Keywords:

    composite materials, fiber composites, stress wave propagation, flexural specimen, dynamic stress analysis, frequencies, mode shapes, transient response analysis, fracture toughness, smooth specimen, notched specimen, dynamic stress intensity, static stress intensity


    Paper ID: STP35358S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP35358S


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