On chip formation mechanism in orthogonal cutting of bone
On chip formation mechanism in orthogonal cutting of bone
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DOI：
10.1016/j.ijmachtools.2015.12.004
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发表时间：
2016-03-01
影响因子：
14
通讯作者：
Axinte, Dragos A.
中科院分区：
文献类型：
--
作者：
Liao, Zhirong;Axinte, Dragos A.
在大多数外科手术中，骨切割是一个重要的过程；因此，了解芯片形成的机制对于设计优化手术过程的工具非常重要。然而，解决这一问题的研究很少。本文提出了在正交骨切割中，随着未切屑厚度的增加，从剪切切割、剪切裂纹切割和断裂切割模式的过渡。针对这些现象，提出了一种基于断裂力学的切屑形成和切割过程模型。从切屑形成的角度研究了骨的各向异性对正交切割的影响，从而在模型中考虑了相对于骨纤维(即骨粒)在不同切割方向上的切屑形态。实验结果表明，该模型与所提出的模型具有很好的一致性，预测过渡未切屑厚度的最大误差为10%。另一方面，表面形貌分析表明，与切割方式和方向有关的材料损伤模式存在显著差异。此外，还从静态和动态两个角度对切削力进行了分析，验证了所提出的骨正交切削机构。在此基础上，提出了一种独特的各向异性材料作为骨的最大未切割切屑厚度，以指导选择更先进的切割工艺(如钻孔、铣削和锯切)。(C)2016爱思唯尔有限公司。保留所有权利。
Bone cutting is an important procedure in most surgery operations; therefore, understanding the mechanism by which the chip forms is important to design tools for optimising the surgery process. However, only very few studies to address this issue exist. In this paper, a transition from shear cutting, shear-crack cutting and fracture cutting modes with the increase of uncut chip thickness in orthogonal bone cutting was presented. To address these phenomena, a fracture mechanics based cutting model was proposed for the chip formation and cutting process. The influence of the anisotropy of bone to the orthogonal cutting was studied in reference to chip formation and thus, considered in the model to explain the chip morphologies in different cutting directions relative to the bone fibres (i.e. osteon). The experimental result shows to be consistent well with the proposed model yielding a maximum error of predicted transition uncut chip thickness of 10%. On the other hand, analysis of surface morphology revealed that significant differences exist in material damage mode related to the cutting mode and direction. Moreover, the proposed bone orthogonal cutting mechanism was also validated by the cutting force analysis from both static and dynamic components points of view. Based on this study, a maximum uncut chip thickness in a unique anisotropic material as bone to guide the selection of more advanced cutting process (e.g. drilling, milling and sawing) was proposed. (C) 2016 Elsevier Ltd. All rights reserved.