Abstract
Bone cements work under complex triaxial states of stress between the prosthesis and the bone. However, no failure criteria have been formulated for such materials. In the present work two acrylic bone cements have been tested under triaxial stresses up to failure and it has been shown that they behave following the Coulomb-Mohr criterion. Tests have been carried out with moulded thick-wall cylindrical hollow specimens. The samples were unidirectionally compressed whilst a constant internal pressure was provided. Although weaker, one of the bone cements exhibits a similar behaviour to industrial polymethylmethacrylate (PMMA). The different behaviour of these bone cements cannot be related to porosity, which ranges from 1 to 4% in both materials, nor to their different molecular weight. It has been shown that the different morphologies of the bone cement PMMA powders may account for their different mechanical behaviour. It seems that a more homogeneous distribution of sizes, ranging from 10 to 50 µm, and shapes (practically spherical) gives rise to a material which behaves in a similar way to industrial PMMA.
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Silvestre, A., Raya, A., Fernández-Fairén, M. et al. Failure of acrylic bone cements under triaxial stresses. J Mater Sci 25, 1050–1057 (1990). https://doi.org/10.1007/BF03372202
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DOI: https://doi.org/10.1007/BF03372202