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The mechanical behavior of polypropylene polymer was investigated under the effect of various temperatures. Mechanical properties of polymer were carried out through uniaxial tensile tests for low and high temperatures respectively. The results showed that both yield stress and the elastic modulus of the material decrease with the increase of temperature. Similarly, the post-yielding behavior of the material can be clearly observed at low temperature, and this behavior gradually disappears as the temperature increases. A phenomenological constitutive model is proposed in order to understand the mechanical behavior of polymer by combining the hyperbolic and multi-linear relationships. It is based on the experiments, and the proposed constitutive model is successfully validated by the excellent agreement between model prediction and experimental results. [ABSTRACT FROM AUTHOR]

Under extreme services conditions, the dynamic mechanical properties of polymer matrix composites play an important role in controlling the durability of composite structures. Temperature-frequency-dependent dynamic mechanical properties of glass/epoxy composites were studied under different loading modes by dynamic mechanical analysis. The temperature-dependent modulus and temperature-frequency-dependent modulus models of epoxy resin and glass/epoxy composites were developed. The physical meaning and how to determine the values of parameters in the model were discussed. All the model predictions showed good agreements with the experimental results. [ABSTRACT FROM AUTHOR]