Abstract
Generating topological microstructures on the surface of cortical bone to establish a suitable microenvironment can guide bone cells to achieve bone repair. Single-point diamond tools (SPDTs) have advantages in efficiency and flexibility to fabricate surface microstructures. However, the cutting force during ploughing cannot be predicted and controlled due to the special properties of cortical bone. In this paper, a novel cutting model for ploughing cortical bone using an SPDT was established, and we comprehensively considered the shear stress anisotropy of the bone material and the proportional relationship between the normal force and the tangential force. Then, the orthogonal cutting experiment was used to verify the model. The results show that the error of calculated value and the experimental data is less than 5%. The proposed model can be used to assist the fabrication of microstructures on cortical bone surface using an SPDT.
Highlights
The topological structure of the bone material surface can contribute to the directed differentiation of bone cells into osteoblasts as reported by Langer and Vacanti [1]
One can see in the morphology of indentation of the Single-point diamond tools (SPDTs), shown in Figure 4, that the surface of the cortical bone has an irreversible plastic deformation indentation
The normal force and tangential force in cortical bone ploughing were modeled by considering the mechanical properties of cortical bone and its anisotropic multilevel micro–nano structure
Summary
The topological structure of the bone material surface can contribute to the directed differentiation of bone cells into osteoblasts as reported by Langer and Vacanti [1]. Alison et al asserted that determining how to construct a suitable topological structure to achieve desired functions has become the latest research goal [2]. The traditional preparation methods mainly included sandblasting, polishing, vapor deposition, and so on [3,4,5]. The single-point diamond tool (SPDT) is more efficient and flexible than the above techniques. Jing Ni et al fabricated bionic microstructure on the rake face of broach by SPDT to improve processing accuracy and efficiency [6]. There are many microstructure production research studies involving ploughing microgrooves
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