Towards understanding the cutting and fracture mechanism in ceramic matrix composites
Ceramic Matrix Composites (CMCs) are increasingly used for the manufacture of high-value parts for several industries such as the aerospace, nuclear and automotive. Nevertheless, their heterogenic, anisotropic and brittle nature make difficult to characterise the machining process and therefore, an...
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| Format: | Article |
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Elsevier
2017
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| Online Access: | https://eprints.nottingham.ac.uk/41706/ |
| _version_ | 1848796336632102912 |
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| author | Gavaldà Díaz, O. Axinte, Dragos A. |
| author_facet | Gavaldà Díaz, O. Axinte, Dragos A. |
| author_sort | Gavaldà Díaz, O. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Ceramic Matrix Composites (CMCs) are increasingly used for the manufacture of high-value parts for several industries such as the aerospace, nuclear and automotive. Nevertheless, their heterogenic, anisotropic and brittle nature make difficult to characterise the machining process and therefore, an in-depth understanding of the cutting mechanics is needed. In this regard, this paper aims to understand the different behaviours of CMCs while employing orthogonal cutting. The first part of this article proposes a novel theoretical approach to explain the different types of cutting behaviours (fracture and shear cutting) based on the inelastic and orthotropic properties of the CMC's by using a high imaging system and measuring the cutting forces. The second part aims to understand the cutting and fracture mechanism by developing for the first time a specific analytical model for each of the three main orthotropic orientations, defined by the three main relative fibre orientations respect to the feed direction, which are found in cutting of CMCs. This is approached by the calculation of the specific cutting energy needed to fracture the CMC's during cutting (energy release rate, Gc) using fracture mechanics and cutting theories. This analytical model has been successfully validated for a Carbon/Carbon composite with the experimental data obtained for the brittle cutting and by introducing the concept of a rising R-curve in cutting models. Moreover, comparing the results obtained for the energy release rate for the brittle and semi-ductile mode, it is observed that the material experiences an important change in the energy release rate according to the brittle-to-semi-ductile transition occurring while reducing the depth of cut. Finally, a novel monitoring method based on the vibrations of the sample has been found successful to understand the type of crack formation appearing while cutting CMCs. |
| first_indexed | 2025-11-14T19:46:22Z |
| format | Article |
| id | nottingham-41706 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:46:22Z |
| publishDate | 2017 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-417062020-05-04T18:40:01Z https://eprints.nottingham.ac.uk/41706/ Towards understanding the cutting and fracture mechanism in ceramic matrix composites Gavaldà Díaz, O. Axinte, Dragos A. Ceramic Matrix Composites (CMCs) are increasingly used for the manufacture of high-value parts for several industries such as the aerospace, nuclear and automotive. Nevertheless, their heterogenic, anisotropic and brittle nature make difficult to characterise the machining process and therefore, an in-depth understanding of the cutting mechanics is needed. In this regard, this paper aims to understand the different behaviours of CMCs while employing orthogonal cutting. The first part of this article proposes a novel theoretical approach to explain the different types of cutting behaviours (fracture and shear cutting) based on the inelastic and orthotropic properties of the CMC's by using a high imaging system and measuring the cutting forces. The second part aims to understand the cutting and fracture mechanism by developing for the first time a specific analytical model for each of the three main orthotropic orientations, defined by the three main relative fibre orientations respect to the feed direction, which are found in cutting of CMCs. This is approached by the calculation of the specific cutting energy needed to fracture the CMC's during cutting (energy release rate, Gc) using fracture mechanics and cutting theories. This analytical model has been successfully validated for a Carbon/Carbon composite with the experimental data obtained for the brittle cutting and by introducing the concept of a rising R-curve in cutting models. Moreover, comparing the results obtained for the energy release rate for the brittle and semi-ductile mode, it is observed that the material experiences an important change in the energy release rate according to the brittle-to-semi-ductile transition occurring while reducing the depth of cut. Finally, a novel monitoring method based on the vibrations of the sample has been found successful to understand the type of crack formation appearing while cutting CMCs. Elsevier 2017-04-02 Article PeerReviewed Gavaldà Díaz, O. and Axinte, Dragos A. (2017) Towards understanding the cutting and fracture mechanism in ceramic matrix composites. International Journal of Machine Tools and Manufacture . ISSN 0890-6955 (In Press) Machining; Ceramic Matrix Composites; Orthogonal cutting; Fracture mechanism; Crack formation http://www.sciencedirect.com/science/article/pii/S089069551630668X doi:10.1016/j.ijmachtools.2017.03.008 doi:10.1016/j.ijmachtools.2017.03.008 |
| spellingShingle | Machining; Ceramic Matrix Composites; Orthogonal cutting; Fracture mechanism; Crack formation Gavaldà Díaz, O. Axinte, Dragos A. Towards understanding the cutting and fracture mechanism in ceramic matrix composites |
| title | Towards understanding the cutting and fracture mechanism in ceramic matrix composites |
| title_full | Towards understanding the cutting and fracture mechanism in ceramic matrix composites |
| title_fullStr | Towards understanding the cutting and fracture mechanism in ceramic matrix composites |
| title_full_unstemmed | Towards understanding the cutting and fracture mechanism in ceramic matrix composites |
| title_short | Towards understanding the cutting and fracture mechanism in ceramic matrix composites |
| title_sort | towards understanding the cutting and fracture mechanism in ceramic matrix composites |
| topic | Machining; Ceramic Matrix Composites; Orthogonal cutting; Fracture mechanism; Crack formation |
| url | https://eprints.nottingham.ac.uk/41706/ https://eprints.nottingham.ac.uk/41706/ https://eprints.nottingham.ac.uk/41706/ |