Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.ijmachtools.2006.05.006
Title: Crack initiation in relation to the tool edge radius and cutting conditions in nanoscale cutting of silicon
Authors: Cai, M.B.
Li, X.P. 
Rahman, M. 
Tay, A.A.O. 
Keywords: Crack
Molecular dynamics
Nanoscale cutting
Silicon wafer
Issue Date: Mar-2007
Source: Cai, M.B., Li, X.P., Rahman, M., Tay, A.A.O. (2007-03). Crack initiation in relation to the tool edge radius and cutting conditions in nanoscale cutting of silicon. International Journal of Machine Tools and Manufacture 47 (3-4) : 562-569. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ijmachtools.2006.05.006
Abstract: In cutting of brittle materials, experimentally it was observed that there is a ductile-brittle transition when the undeformed chip thickness is increased from smaller to larger than the tool cutting edge radius of the zero rake angle. However, how the crack is initiated in the ductile-brittle mode transition as the undeformed chip thickness is increased from smaller to larger than the tool cutting edge radius has not been fully understood. In this study, the crack initiation in the ductile-brittle mode transition as the undeformed chip thickness is increased from smaller to larger than the tool cutting edge radius has been simulated using the Molecular Dynamics (MD) method on nanoscale cutting of monocrystalline silicon with a non-zero edge radius tool, from which, for the first time, a peak deformation zone in the chip formation zone has been found in the transition from ductile mode to brittle mode cutting. The results show that as the undeformed chip thickness is larger than the cutting edge radius, in the chip formation zone there is a peak deformation depth in association with the connecting point of tool edge arc and the rake face, and there is a crack initiation zone in the undeformed workpiece next to the peak deformation zone, in which the material is tensile stressed and the tensile stress is perpendicular to the direction from the connecting point to the peak. As the undeformed chip thickness is smaller than the cutting edge radius, there is no deformation peak in the chip formation zone, and thus there is no crack initiation zone formed in the undeformed workpiece. This finding explains well the ductile-brittle transition as the undeformed chip thickness increases from smaller to larger than the tool cutting edge radius. © 2006 Elsevier Ltd. All rights reserved.
Source Title: International Journal of Machine Tools and Manufacture
URI: http://scholarbank.nus.edu.sg/handle/10635/59813
ISSN: 08906955
DOI: 10.1016/j.ijmachtools.2006.05.006
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

25
checked on Dec 6, 2017

WEB OF SCIENCETM
Citations

23
checked on Nov 21, 2017

Page view(s)

43
checked on Dec 10, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.