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The Effect of Strain Rate on Bone Fragility and Clinical Applications
Marijo Bekić1, Petra Bagavac2, Nenad Šešić1
1Dubrovnik County Hospital, 20000 Dubrovnik, Croatia.
Abstract:
The loading rate influences the fracture mechanics of bone. The effect of strain rate on bone tissue was studied. Two sets of dynamic tests were performed, where the impact energy E = 70 J was kept as a constant value. In the first set, the impact velocity of the striker was set to 5.15 m/s, and in the second set of dynamic tests, the impact velocity was set to 7.84 m/s. In each set, four pig femurs were tested, resulting in a total of eight femurs tested. In order to maintain the same impact energy, when testing at a lower velocity, a set of weights (+3 kg) was added to the impactor. The ductility index evaluates the propagation behaviour of brittle versus ductile fracture based on direct force measurements from a force/time diagram.
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