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    An Investigation of Stress-Dependent, Temperature-Dependent, and Time-Dependent Strains in Randomly Oriented Fiber Reinforced Composites

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    The effect on modulus change due to temperature on the stress-strain response of a glass fiber reinforced composite is discussed. Operationally simple constitutive equations for stress and strain computation while material temperature is transient are presented; these equations employ stress, internal specimen time, coefficient of thermal expansion, and measured material constants to determine the stress-strain response of fiberglass composites. Formulation of generalized constitutive equations to particular stress temperature histories is adduced and experimentally verified.


    total strain, thermal strain, constitutive, internal time, temperature-shifted real time, internal variable, viscoelastic strain, creep compliance, relaxation modulus, apparent modulus, slope of stress-strain curve, coefficient of free thermal expansion

    Author Information:

    Caulfield, EM
    Director of Mechanical Engineering, Packer Engineering Associates, Naperville, Ill.

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP29380S