Abstract
Fracture mechanics approach provides useful information about failure behaviour of cortical bone. The understanding of failure mechanism of cortical bone is important for both medical and engineering researchers. Several toughening mechanisms associated with bone failure are responsible for significant amount of nonlinearity during bone deformation. The present study has been conducted to compare elastic and plastic parts of energy dissipated during bone fracture. Fracture toughness of cortical bone is determined in terms of J-toughness based of elastic-plastic fracture mechanics approach to determine energy dissipated during crack propagation. Total fracture energy is determined with the help of small punch testing in terms of area under curve values. It has been found during this study that elasticity plays an important role during crack propagation, however, plasticity has greater contribution during total fracture of bone staring from crack initiation to crack propagation. A significant linear relationship is obtained between plastic part of J-toughness and plastic part of fracture energy determined in terms of area under curve values. This relationship shows the contribution of various toughening mechanisms during crack initiation as well as its further propagation till fracture.
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