Abstract
Diffusion of environmental solution into the matrix accelerates propagation of the stress-corrosion cracking in composite materials. Single fiber fragmentation tests were conducted after immersing the stressed and unstressed specimens, single fiber E-glass/Vinylester model composites, in the environmental solutions (water/H_2SO_4) to examine the degradation mechanism. The fiber strength in the matrix and the interfacial shear strength were evaluated. As a result, fiber strength of stressed specimens was more decreased than that of unstressed specimens. However the decrease of interfacial shear strength had no difference between stressed specimens and unstressed specimens. This indicates that diffusion was accelerated by the stress, and degradation of fiber and interface depends on the diffusion of environmental solution. The result of Fickian diffusion analysis indicates that water reaches around a fiber before acid reaches. In this study, the effect of moisture diffusion on each material was mainly discussed.
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