有限要素解析を用いた長繊維自己治癒セラミックスのき裂分岐条件に関する研究

抄録

Research and development of game-changing ultrahigh reliability ceramics composite material has been conducted to resolve the reduce carbon dioxide emissions. This material is called self-healing fiber-reinforced ceramics (shFRC), and it consists of three layers: a base material layer called a matrix, a fiber layer called a fiber bundle, and an interlayer containing a material called a “self-healing agent”. When the microcracks owing to foreign object collision occur, the rapid fracture is suppressed by crack bifurcation at the interlayer. It is also possible to suppress brittle fractures by the effect of frictional resistance. Further, when a crack propagates in the interlayer subsistent self-healing agent, self-healing autonomously occurs owing to high-temperature oxidation. However, to effectively demonstrate the self-healing function, a crack bifurcation have to be controlled. In this study, the crack propagation is investigated using the Finite Element Analysis (FEA). In FEA, the microscopic structure of shFRC having three-layer construction is discretized. Using FEA, ideal relationships of fracture parameters between fiber bundle and interlayer considering with composite ratio of each layer, sintering characteristics and its dispersion are examined. In this results, depression effect of fiber bundle fracture was increased by porosity decreased. It may be possible to propose guide of back-casting about porosity, thickness and fracture parameter of interface layer to what extent expected at the structural design of shFRC.