Elastic Behavior of Open‐Cell Alumina

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Abstract
The elastic constants of open‐cell aluminas were measured as a function of their relative density and cell size. The density exponent was found to be in excellent agreement with previous theoretical work that considered cell strut bending as a major deformation mode. The measured constants in the elastic behavior relationships were found to be less than previously suggested, and it was found that this factor is sensitive to the microstructure of the cell struts, especially porosity within these struts. The materials studied were found to contain soem closed cells, but these were not found to have a major effect on the elastic behavior. The values of Young's modulus and the shear modulus depended on the relative density in the same way, and this is consistent with previous theoretical work which showed that Poisson's ratio should be independent of density.

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