ロービングクロスFRPのFiber/Matrix, Matrix/MatrixおよびFRP/FRP界面強度について

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In the previous paper, the relation between fiber/matrix and FRP/ERP interfaces and its dependence on matrix were discussed on the basis of the tensile tests of FRP along its flatwise direction. The results obtained showed that the location of the weakest interface varies depending upon the condition used and so the matrix dependent property of interface may be evaluated by such a test. In this paper, the relation among three interfaces (fiber/matrix, matrix/matrix and FRP/FRP interfaces) and its dependence on matrix were studied by using roving glass cloth FRP with the matrix/matrix interface formed after various resting times before the wet on dry laminating process. The results obtained are as follows. (1) In the case of FRP/FRP interface with sufficiently high bond strength, the weakest interface is fiber/matrix interface irrespective of matrix or laminating condition in a nomal state. Therefore, the bond strength seems to vary little and the difference in strength due to the thickness effect produced by the condition of wet on dry laminating process depends on matrix but it does not essentially affect the fracture mode. (2) The weakest interface under the condition of immersion in boiling water depends on matrix, laminating condition and immersion time. Especially the location of the weakest interface is affected by the thickness effect in addition to the resting time before the wet on dry laminating process and the immersion time, and it depends also on the property of matrix. (3) In general, fiber/matrix interface is the weakest among the three but either FRP/FRP or matrix/matrix interface becomes the weakest interface in some other conditions. Therefore, by selecting such conditions, it is possible to evaluate the property of interface in FRP individually.
社団法人日本材料学会の論文
1977-10-15

ロービングクロスFRPのFiber/Matrix, Matrix/MatrixおよびFRP/FRP界面強度について

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