Applicability of Time-Temperature-Water Absorption Superposition Principle for Flexural Strength of CFRP Laminates

摘要

This paper is concerned with the influence of water absorption on the time-temperature dependent flexural strength of CFRP laminates. The CFRP laminates were prepared under three conditions of "Dry", "Wet", and "Wet + Dry". The "Dry" laminates were obtained by holding the cured laminates in the oven at 150℃ for 2 hours, the "Wet" laminates were obtained by soaking the "Dry" laminates in hot water at 95℃ for 12, 24 and 48 hours, and the "Wet + Dry" laminates were obtained by dehydrating the "Wet" laminates in the oven at 150℃ for 2 hours. The constant strain rate (CSR) bending tests at various strain rates and temperatures as well as the creep test at various temperatures were carried out for these three kinds of laminates. The time-temperature dependence of flexural CSR strength and creep compliance of these laminates were obtained and the influence of water absorption on these strength and creep compliance were discussed. As results, the master-master curves of CSR strength as well as creep compliance were constructed based on the time-temperature-water absorption superposition principle.