Abstract
The fracture mechanics parameters of critical stress intensity factor ( K c ) and critical strain energy release rate ( G c ) for longitudinal fracture of bovine tibia cortical bone were determined by the compact tension method. It was demonstrated that, for a given bone density, K c and G c depended on the loading rate, and resultant crack velocity, with a maximum in fracture toughness ( K c ∼ 6.3 MNm −3 2 , G c ∼ 2900 Jm −2) at a crack velocity ∼ 10 −3 ms −1. For a given loading rate, or crack velocity, an increase in bone density, in the range from 1.92 to 2.02 Mgm −3, produced increases in K c and G c , but a variation in speciment thickness (from 0.5 to 2 mm) had no effect on the measured fracture mechanics parameters.
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