Design, Manufacturing and Testing of a Bone Shaft Fatigue Machine

To determine the mechanical properties of materials subjected to repetitive loading, fatigue testing is a well–established method in engineering studies. It is believed that the cause of stress fractures in cortical bone are due to the repetitive loading. There is currently no cost–effective device that accounts for the variety of factors influencing the fatigue behaviour of bone in vivo. The Bone Shaft Fatigue Machine is proposed as a possible solution and designed as a rotating bending fatigue tester with a constant stress amplitude. Sheep metatarsal bone shaft specimens designed and machined for fatigue tests. The results were determined to be in accordance with the expected fatigue stresses and cycles reported in current literature. The Bone Shaft Fatigue Machine was also found to be cost-effective and applicable to the testing of materials in research areas other than the study of cortical bone.

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