A numerical and experimental investigation into the generated when cutting biomaterials

C. T. McCarthy; EO'Dwyer; M. Hussey; M. D. Gilchrist; N. P. O'Dowd

A numerical and experimental investigation into the generated when cutting biomaterials

C. T. McCarthy, EO'Dwyer, M. Hussey, M. D. Gilchrist, N. P. O'Dowd

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

This paper presents an investigation into the forces generated when cutting biomaterials with surgical scalpel blades. An elastomer with similar mechanical properties to human skin was chosen as a reference material for the investigation. An experimental test rig was designed and built to measure the cutting forces acting on the blade. A number of parameters were examined such as cutting rate, blade sharpness and friction in lubricated or dry cutting. It was found that the lubricated blade required the least amount of energy to cut and also produced the lowest and most uniform cutting forces. To quantify blade sharpness, the maximum cutting force and total cutting energy were evaluated and it was found that both methods could identify differences between sharp and blunt blades. However, the cutting energy approach provided a more descriptive measure as it included both the blade displacement and cutting force. A finite element model was constructed to examine the mechanics of the cutting process and it is shown that the problem is highly non-linear due to non-linear material behavior, geometric non-linearity and non-linear boundary conditions due to contact and friction. It is shown that the stress on the surface of the substrate changes from compressive (initially) to tensile and it is postulated that these tensile stresses cause microcracks to open and form the cut. Copyright

Original language	English
Title of host publication	Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004
Editors	M. Helmus, D. Medlin
Pages	140-145
Number of pages	6
Publication status	Published - 2005
Externally published	Yes
Event	Medical Device Materials II - Materials and Processes for Medical Devices Conference 2004 - St. Paul, MN, United States Duration: 25 Aug 2004 → 27 Aug 2004

Publication series

Name	Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004

Conference

Conference	Medical Device Materials II - Materials and Processes for Medical Devices Conference 2004
Country/Territory	United States
City	St. Paul, MN
Period	25/08/04 → 27/08/04

Cite this

McCarthy, C. T., EO'Dwyer, Hussey, M., Gilchrist, M. D., & O'Dowd, N. P. (2005). A numerical and experimental investigation into the generated when cutting biomaterials. In M. Helmus, & D. Medlin (Eds.), Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004 (pp. 140-145). (Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004).

McCarthy, C. T. ; EO'Dwyer ; Hussey, M. et al. / A numerical and experimental investigation into the generated when cutting biomaterials. Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004. editor / M. Helmus ; D. Medlin. 2005. pp. 140-145 (Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004).

@inproceedings{dbdf50498bb04b14a0c3b79f9fbe7090,

title = "A numerical and experimental investigation into the generated when cutting biomaterials",

abstract = "This paper presents an investigation into the forces generated when cutting biomaterials with surgical scalpel blades. An elastomer with similar mechanical properties to human skin was chosen as a reference material for the investigation. An experimental test rig was designed and built to measure the cutting forces acting on the blade. A number of parameters were examined such as cutting rate, blade sharpness and friction in lubricated or dry cutting. It was found that the lubricated blade required the least amount of energy to cut and also produced the lowest and most uniform cutting forces. To quantify blade sharpness, the maximum cutting force and total cutting energy were evaluated and it was found that both methods could identify differences between sharp and blunt blades. However, the cutting energy approach provided a more descriptive measure as it included both the blade displacement and cutting force. A finite element model was constructed to examine the mechanics of the cutting process and it is shown that the problem is highly non-linear due to non-linear material behavior, geometric non-linearity and non-linear boundary conditions due to contact and friction. It is shown that the stress on the surface of the substrate changes from compressive (initially) to tensile and it is postulated that these tensile stresses cause microcracks to open and form the cut. Copyright",

author = "McCarthy, {C. T.} and EO'Dwyer and M. Hussey and Gilchrist, {M. D.} and O'Dowd, {N. P.}",

year = "2005",

language = "English",

isbn = "0871708248",

series = "Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004",

pages = "140--145",

editor = "M. Helmus and D. Medlin",

booktitle = "Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004",

note = "Medical Device Materials II - Materials and Processes for Medical Devices Conference 2004 ; Conference date: 25-08-2004 Through 27-08-2004",

}

McCarthy, CT, EO'Dwyer, Hussey, M, Gilchrist, MD & O'Dowd, NP 2005, A numerical and experimental investigation into the generated when cutting biomaterials. in M Helmus & D Medlin (eds), Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004. Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004, pp. 140-145, Medical Device Materials II - Materials and Processes for Medical Devices Conference 2004, St. Paul, MN, United States, 25/08/04.

A numerical and experimental investigation into the generated when cutting biomaterials. / McCarthy, C. T.; EO'Dwyer; Hussey, M. et al.
Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004. ed. / M. Helmus; D. Medlin. 2005. p. 140-145 (Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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PY - 2005

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N2 - This paper presents an investigation into the forces generated when cutting biomaterials with surgical scalpel blades. An elastomer with similar mechanical properties to human skin was chosen as a reference material for the investigation. An experimental test rig was designed and built to measure the cutting forces acting on the blade. A number of parameters were examined such as cutting rate, blade sharpness and friction in lubricated or dry cutting. It was found that the lubricated blade required the least amount of energy to cut and also produced the lowest and most uniform cutting forces. To quantify blade sharpness, the maximum cutting force and total cutting energy were evaluated and it was found that both methods could identify differences between sharp and blunt blades. However, the cutting energy approach provided a more descriptive measure as it included both the blade displacement and cutting force. A finite element model was constructed to examine the mechanics of the cutting process and it is shown that the problem is highly non-linear due to non-linear material behavior, geometric non-linearity and non-linear boundary conditions due to contact and friction. It is shown that the stress on the surface of the substrate changes from compressive (initially) to tensile and it is postulated that these tensile stresses cause microcracks to open and form the cut. Copyright

AB - This paper presents an investigation into the forces generated when cutting biomaterials with surgical scalpel blades. An elastomer with similar mechanical properties to human skin was chosen as a reference material for the investigation. An experimental test rig was designed and built to measure the cutting forces acting on the blade. A number of parameters were examined such as cutting rate, blade sharpness and friction in lubricated or dry cutting. It was found that the lubricated blade required the least amount of energy to cut and also produced the lowest and most uniform cutting forces. To quantify blade sharpness, the maximum cutting force and total cutting energy were evaluated and it was found that both methods could identify differences between sharp and blunt blades. However, the cutting energy approach provided a more descriptive measure as it included both the blade displacement and cutting force. A finite element model was constructed to examine the mechanics of the cutting process and it is shown that the problem is highly non-linear due to non-linear material behavior, geometric non-linearity and non-linear boundary conditions due to contact and friction. It is shown that the stress on the surface of the substrate changes from compressive (initially) to tensile and it is postulated that these tensile stresses cause microcracks to open and form the cut. Copyright

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T3 - Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004

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BT - Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004

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T2 - Medical Device Materials II - Materials and Processes for Medical Devices Conference 2004

Y2 - 25 August 2004 through 27 August 2004

ER -

McCarthy CT, EO'Dwyer, Hussey M, Gilchrist MD, O'Dowd NP. A numerical and experimental investigation into the generated when cutting biomaterials. In Helmus M, Medlin D, editors, Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004. 2005. p. 140-145. (Medical Device Materials II - Proceedings of the Materials and Processes for Medical Devices Conference 2004).

A numerical and experimental investigation into the generated when cutting biomaterials

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