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Probabilistic modelling of tool unbalance during cutting of hard-heterogeneous materials: a case study in Ceramic Matrix Composites (CMCs)

Diaz, O. Gavalda; Axinte, Dragos A.; Novovic, D.

Probabilistic modelling of tool unbalance during cutting of hard-heterogeneous materials: a case study in Ceramic Matrix Composites (CMCs) Thumbnail


Authors

O. Gavalda Diaz

DRAGOS AXINTE dragos.axinte@nottingham.ac.uk
Professor of Manufacturing Engineering

D. Novovic



Abstract

Compared to other materials, CMCs display a unique high hardness and heterogeneous nature which are critically reflected during the drilling process where asymmetrical high forces are suffered by the tool, resulting in an unbalance of the drill bit. Hence, this study proposes a mechanistic approach where the hard nature resulting in high radial forces is analytically studied and coupled with a probabilistic model where the heterogeneous nature of CMCs is taken into consideration. This theoretical study results in an in-depth understanding of the loading unbalance occurring on different tool sizes during drilling of CMCs which can lead to a premature tool breakage. The nature of this unique force that is assumed in the theoretical approach to influence the cutting of hard-heterogeneous materials is experimentally validated by drilling a homogeneous and a heterogeneous hard ceramics, i.e. a monolithic SiC and a SiC/SiC CMC. Moreover, the model developed together the with drilling experiments with different tool diameters result in an understanding of why small tool diameters suffer a premature tool breakage when drilling difficult-to-machine CMCs.

Citation

Diaz, O. G., Axinte, D. A., & Novovic, D. (2018). Probabilistic modelling of tool unbalance during cutting of hard-heterogeneous materials: a case study in Ceramic Matrix Composites (CMCs). Composites Part B: Engineering, 148, https://doi.org/10.1016/j.compositesb.2018.04.029

Journal Article Type Article
Acceptance Date Apr 9, 2018
Online Publication Date May 3, 2018
Publication Date Sep 1, 2018
Deposit Date May 9, 2018
Publicly Available Date May 4, 2019
Journal Composites Part B: Engineering
Print ISSN 1359-8368
Electronic ISSN 1879-1069
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 148
DOI https://doi.org/10.1016/j.compositesb.2018.04.029
Keywords Machining; Ceramic Matrix Composites; Instabilities; Heterogeneous materials; Hard materials
Public URL https://nottingham-repository.worktribe.com/output/949311
Publisher URL https://www.sciencedirect.com/science/article/pii/S1359836818302105
Contract Date May 9, 2018

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