多層繊維強化Carbon/Carbon複合材料の層間破壊基準

概要

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Carbon/Carbon composites (C/C) have recently been studied and developed for structural applications in the field of aerospace and power generator technologies. However, C/C has low interlaminar strength. Therefore, it is important to evaluate interlaminar fracture properties and test methods for interlaminar strength. In the present paper, each of the ILSS (interlaminar shear strength), the ILTS (interlaminar tensile strength) and the interlaminar mixed mode strength with the coexistence of interlaminar shear and tensile or compressive stresses was studied by using several different test methods on C/C. The ILSS was obtained by using the SBS (short beam shear) test, the DNS (double notch shear) test, the Arcan test and the quasi-Arcan shear mode test. The ILTS was obtained by using the Arcan test and the quasi-Arcan tensile mode test. The interlaminar mixed-mode strength was obtained by the Arcan test. Comparisons of respective tests and several laminate configurations were conducted using microscopic failure mechanism and 3-dimensional FEM analysis. Both Von-Mises, Tsai-Hill and Tsai-Wu failure criterions were used to explain the mixed-mode fracture behavior. Effects of notch stress concentration were found negligible based on FEM analysis and experimental results.
社団法人日本機械学会の論文
1999-04-25