Experimental Investigation on the Failure Mechanism of Bovine Bone by Three-point Bending Tests

Abstract

Bone damage is a common type of sport injury. The loading rate affects the type of fracture and the degree of soft tissue injury. In view of the problem of whole bone bending damage and failure, this paper introduces the test method of bovine bone bending and the mechanism of bending failure under different loading rates is analyzed through experimental research and theoretical analysis. The results of three-point bending failure test of bovine bone are given and the influence of loading rate on bending failure is discussed. The results show that there are three main deformation and failure modes of bovine bone under different loading rates, namely the mode of fracture failure under high loading rate, the mode of shear failure under medium loading rate and the mode of local wedge failure under low loading rate. With the increase of loading rate, the greater the failure force is applied on the bone, the smaller the destructive deflection of the bone will be. The maximum strain of bone decreases with the increase of loading rate, while the flexural modulus of bone increases gradually, which indicates that the loading rate has an effect on the brittleness of the whole bone. For the bending model of the whole bovine bone, the prediction result of elliptical cross-section method is more in accordance with the actual situation than that of circular cross-section method.