微視クラック分散モデルによる多孔質セラミックスの応力-ひずみ非線形挙動解析

概要

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Porous ceramics have nonlinear stress-strain behavior and are expected to have damage tolerance capability. To assess the nonlinear behavior, we have proposed distributed-micro-crack model. In this paper, some assessment results with the distributed-micro-crack model for porous ceramics are presented. The effects of R-curve behavior and stress concentration are included in the assessment. Constitutive equation of distributed-micro-crack model has been expanded from uniaxial stress model to multiaxial stress model to consider the stress concentration. It was found that our proposed model can simulate the nonlinear stress-strain relationship of porous ceramics for various loading condition such as 3-point bending, 4-point bending with smooth specimen and 4-point bending with notched specimen etc. These simulations also show that 3-point bending test is suitable for assessing nonlinear stress-strain behavior than 4-point bending because 3-point bending can localize the nonlinear stress-strain behavior region which is easily measured by strain gage.
社団法人日本機械学会の論文
2006-01-25