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Improvements of material removal in cortical bone via impact cutting method

journal contribution
posted on 27.04.2020 by Wei Bai, Liming Shu, Ronglei Sun, Jianfeng Xu, Vadim Silberschmidt, Naohiko Sugita
Bone cutting with high efficiency as well as low levels of forces and damage has a great significance for orthopaedic surgeries. Due to the brittleness and anisotropy of cortical bone, a conventional cutting process can cause irregular crack propagation and fractured bone chip, affecting the tissue removal process and postoperative recovery. In this paper, a high-frequency impact cutting method is investigated, and its effect on fracture propagation, chip formation and cutting forces is studied for orthogonal cutting. Experimental results show that cracks are deflected by cement lines in conventional cutting, forming fractured blocks or split chips. In impact cutting, the cutting-induced fractures expand along a main shear direction, generating small pieces of triangular segmented chips. Cutting forces are significantly reduced with vibration-induced impacts; especially, the main cutting force is nearly 70% lower than that in the conventional cutting. The main reason for this is much higher strain rates in high-frequency impact cutting than in a conventional process, and direct penetration of fractures across the osteonal matrix without deflections along the cement lines. This results in a straighter path along the main shear plane and totally different chip morphology; so, a lower consumption of cutting energy in the main shear direction reduces the macroscopic cutting force. The results of this study have an important theoretical and practical value for revealing the mechanism of impact cutting, improving the efficiency of osteotomy and supporting the innovation in bone surgical instruments.

Funding

China Postdoctoral Science Foundation through grants No. 2019M652629 and No. 2019TQ0107

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Journal of the Mechanical Behavior of Biomedical Materials

Volume

108

Issue

August 2020

Publisher

Elsevier BV

Version

AM (Accepted Manuscript)

Rights holder

© Elsevier Ltd

Publisher statement

This paper was accepted for publication in the journal Journal of the Mechanical Behavior of Biomedical Materials and the definitive published version is available at https://doi.org/10.1016/j.jmbbm.2020.103791.

Acceptance date

12/04/2020

Publication date

2020-04-18

Copyright date

2020

ISSN

1751-6161

Language

en

Depositor

Prof Vadim Silberschmidt. Deposit date: 25 April 2020

Article number

103791

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