抄録
The advanced accelerated testing methodology(ATM-2)for the long-term life prediction of CFRP laminates exposed to an actual loading having general stress and temperature history is proposed based on the accelerated testing methodology(ATM-1)established for the long-term life prediction of CFRP laminates exposed to a fixed stress history such as static, creep or fatigue loadings at a constant temperature. The most important condition for ATM-1 is the fact that the same time-temperature superposition principle to be held for the viscoelastic behavior of matrix resin holds for the static, creep and fatigue strengths of CFRP laminates. Furthermore, three conditions as the basis of ATM-2 are introduced with the scientific bases. The long-term fatigue strength of CFRP laminates under an actual loading is formulated based on the three conditions. The viscoelastic coefficients of matrix resin, which perform an important role for the time and temperature dependence of long-term life of CFRP laminates, are also formulated based on the time-temperature superposition principle. The applicability of ATM-2 is demonstrated by predicting the long-term fatigue strengths of typical four directions of unidirectional CFRP laminates.
