Abstract
Evaluating long-term strength and mechanical properties of composite materials is important in order to use them as construction materials. When the matrix is polymer materials, the composite materials exhibit viscoelasticity. Therefore long-term strength prediction should be based on viscoelasticity. In this study, constant strain rate tests of PBT and short fiber reinforced PBT are performed. As a result, it is confirmed that time-temperature superposition principle can be applied the strength and elastic modulus of each material. And those shift factors coincide regardless of the fiber volume fraction. It is shown that the prediction of time dependence of the elastic modulus by shear lag model cannot be evaluated long-term elastic modulus correctly.
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