Microdamage accumulation in bovine trabecular bone in uniaxial compression |
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Authors: | Arthur Moore T L Gibson L J |
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Institution: | Division of Health Sciences and Technology, Harvard Medical School-Massachusetts Institute of Technology, Cambridge 02139, USA. tarthur@mit.edu |
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Abstract: | In this study we investigated how microdamage accumulated with increasing compressive strain in bovine trabecular bone. We found that little damage is created in the linear elastic region, up to -0.4 percent strain. At an average strain of -0.76 percent +/-0.25 percent, the stress-strain curve became nonlinear, and peaked at -1.91 percent +/-0.55 percent strain. Microdamage increases rapidly during the peak of the stress-strain curve, and a localized band of damage formed. At strains beyond the ultimate strain, the damaged band widened and the density of damage within the band increased. Microdamage occurred as groupings of cracks; the majority of damage occurred as regions of cross-hatching. All microdamage parameters increased with increasing maximum compressive strain. We also observed exponential relationships between crack numerical density and damage (1(o) - (o)Esec/E0) and between crack length density and damage. |
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