The Influence of Water on the Mechanical Properties and Fatigue Strength of Angle-Ply Carbon/Epoxy Composites

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An investigation of the effect of water absorption on the mechanical properties and fatigue strength of ±45° angle-ply carbon/epoxy composites, i.e., 130℃-cure-type composites T-1/347 and 180℃-cure-type MM-1/982X, has been carried out. In both composites, water absorption lowers the strength of the interface, resulting in a decrease in a tensile strength, an elongation a the break, and fatigue strength. In a higher stress region in laboratory air, cyclic loads make the temperature of a T-1/347 composite so high that plastic deformation of the matrix is enhanced and the fatigue life is shortened. In water, however, the cooling effects of water circulation around specimens become predominant, and hence the fatigue life increases in a high-stress region. We also point out the usefulness of scanning acoustic microscope in the examination of the internal damage of the composites.
一般社団法人日本機械学会の論文
1989-10-15