STP617: Tensile and Compressive Behavior of Borsic/Aluminum

    Herakovich, CT
    Associate professor and graduate student, Virginia Polytechnic Institute and State University, Blacksburg, Va.

    Davis, JG
    Materials engineer, NASA-Langley Research Center, Hampton, Va.

    Viswanathan, CN
    Associate professor and graduate student, Virginia Polytechnic Institute and State University, Blacksburg, Va.

    Pages: 14    Published: Jan 1977


    Abstract

    The results of an experimental investigation of the mechanical behavior of Borsic/aluminum are presented. Composite laminates were tested in tension and compression for monotonically increasing load and also for variable loading cycles in which the maximum load was increased in each successive cycle. It is shown that significant strain-hardening, and corresponding increase in yield stress, is exhibited by the metal matrix laminates. For matrix dominated laminates ([90], [±45]), the current yield stress is essentially identical to the previous maximum stress, and unloading is essentially linear with large permanent strains after unloading. For laminates with fiber dominated behavior ([0], [±30], [0/90], [0/±45]), the yield stress increases with increase in the previous maximum stress, but the increase in yield stress does not keep pace with the previous maximum stress. These fiber dominated laminates exhibit smaller nonlinear strains, reversed nonlinear behavior during unloading, and smaller permanent strains after unloading.

    Compression results from sandwich beams and flat coupons are shown to differ considerably. Results from beam specimens tend to exhibit higher values for modulus, yield stress, and strength.

    Keywords:

    composite materials, tension, compressing, cyclic loads, sandwich laminates, yield strength, strength, residual stress


    Paper ID: STP26953S

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP26953S


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