ランダム配向不連続炭素繊維強化ガラス基複合材料の破壊メカニズム

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Fracture mechanisms in randomly oriented discontinuous carbon fiber reinforced borosilicate glass matrix composites are experimentally chatacterized. Two types of composite specimens with identical constituents but different microstructure were produced. The first type shows the three-stage behavior in the tensile stress-strain curve. In the second type which has the initial cracks, the stress-strain response is almost linear, but the initial Young's modulus is lower than that of the first type. Monotonic and static cyclic tensile and four point bend tests are conducted on those two specimens to measure the microcrack density, Young's modulus and Poisson's ratio as a function of applied strain. The experimentally determined crack density is used to estimate the interfacial shear stress. In the bend tests, evolution of microcracking on the tensile surface and through the thickness has been studied. Acoustic emission(AE) during the tests is monitored to understand the fracture mechanisms. It is proved that the difference in fracture mode between the two specimens is due to the difference in microstructure and the presence of initial defects. The AE behavior shows good correlation with the evolution of microcracking and can explain the fracture processes. Young's modulus can be a damage parameter to estimate the microcrack density. Microcracking during the flexural tests begins on the tensile surface and the cracks progress gradually towards the neutral axis.
社団法人日本材料学会の論文
1998-04-15

ランダム配向不連続炭素繊維強化ガラス基複合材料の破壊メカニズム

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