Formulation of time- and temperature-dependent strength of unidirectional carbon fiber reinforced plastics

Abstract

The time- and temperature-\dependent static strengths for typical three directions of unidirectional carbon fiber reinforced plastic, which are the tensile and compressive static strengths for the longitudinal direction and the tensile static strength for the transverse direction, were measured at various deformation rates and temperatures in our previous paper. By using these measured data, the master curves of these static strengths are constructed based on the time–temperature superposition principle to be held for the viscoelastic behavior of matrix resin. Furthermore, the relationships between the viscoelastic behavior of matrix resin and these static strengths are evaluated on the viewpoints of failure mechanism. The quantitative characteristics of these static strength master curves are discussed using the formulation based on their failure mechanisms.