K-0922 セラミック基ナノ複合材料の高強度化及び高靭化機構(J05-3 高温特性)(J05 複合材料の加工と評価)

概要

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Toughening and strengthening mechanisms in nanocomposites were clarified based on the energy equilibrium between energy release rate and fracture energy rate (known as Griffith's equilibrium), and residual stresses around second-phase nano-particles dispersed in matrix grains. The residual thermal stresses around a spherical dispersed particle within a concentric sphere of a matrix grain were specifically analyzed to clarify the effects of residual stresses on the toughening mechanism in the frontal process zone involving microcracks. The analytical results revealed that the ratio of the thermal expansion coefficients of the particle and matrix has a greater effect on residual stresses than the ratio of the Young's moduli, and that the estimated residual stresses were of sufficient magnitude to generate lattice defects around the particle. The toughening and strengthening mechanisms for nanocomposites were also discussed based on the analytical results and explained schematically.
一般社団法人日本機械学会の論文
2001-08-22