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The fracture behavior of alumina ceramics subjected to triaxial stresses, which were produced in the lower surface (tension side) of a bar with rectangular cross-section by applying uniform bending, was examined. The results obtained are summarized as follows. (1) Under hydrostatic pressures up to 28 kg/mm^2, all specimens fractured in a brittle manner without any plastic deformation. (2) The mode of fracture face around the origin of fracture was not influenced by hydrostatic pressure, and showed almost totally intergranular fracture. (3) The influence of hydrostatic stress σ_m on the maximum tensile stress of three principal stresses occurred in the lower surface of the bar at fracture was examined. The maximum tensile stress was almost constant from the value of σ_m obtained by the expriments at atmospheric,c pressure to σ_m of about 4. 5 kg/mm^2 but decreased with an increase of σ_m to the compression side. (4) When the fracture stresses were expressed in the principal stress space, it was found that none of the stress components of the maximum tensile stress, the maximum shear stress and the octahedral shear stress could be regarded as critical value for fracture. (5) Two kinds of models for fracture were assumed by considering small cracks or cavities in the interior and the surface of a material and the fracture criterion for ceramics was examined. The fracture criterion obtained by assuming small cracks as the most affective factor for fracture agreed approximately with the experimental results.
社団法人日本材料学会の論文
1981-01-15

三軸応力のもとにおけるセラミックスの破壊

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