抄録
This report describes the accelerated testing methodology (ATM) we developed for predicting creep and fatigue strengths of carbon fiber reinforced plastics (CFRP) based on the matrix resin viscoelasticity as applied for statistical creep failure time prediction for a unidirectional CFRP with heat-resistant epoxy resin as matrix under creep tension loading. First, the resin-impregnated CFRP strands are molded by a filament winding system as specimens of unidirectional CFRP. Second, the statistical static strengths of the CFRP strand at a constant strain rate are measured at various temperatures. The statistical creep strengths of the CFRP strand are predicted by substituting the matrix resin viscoelasticity and the statistical tensile static strengths of CFRP strand into the formulation of ATM. The validity of prediction was confirmed by comparison of the creep failure times measured under several constant tension loads at an arbitrary temperature for CFRP strands. Finally, the long-term creep failure time for CFRP strand is predicted statistically based on the time-temperature superposition principle for the matrix resin viscoelasticity.
