Various brittle–ductile transition (BDT) criteria have been developed in the literature to estimate the critical conditions for ductile microcutting of brittle materials. This study provides a unified criterion to efficiently and accurately estimate the critical condition based on the indentation model on brittle materials. The unified criterion correlates with the cutting edge radius, material properties, and a dimensionless coefficient fitted by the experimental data. It shows that the cutting edge geometry is the dominant factor and the maximum undeformed chip thickness (MUCT) can be used as the unified criterion in BDTs. Based on the proposed model, microturning and micromilling have been analyzed to determine the threshold value of the MUCT for ductile microcutting. The model has been validated by the experimental data. Based on the models and three-dimensional geometrical model of microcutting, a further analysis shows that the process conditions greatly affect the microcutting efficiency even though all the conditions may achieve the ductile-regime cutting.
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October 2014
Research-Article
Unified Criterion for Brittle–Ductile Transition in Mechanical Microcutting of Brittle Materials
X. Cheng,
X. Cheng
School of Mechanical Engineering,
Shandong University of Technology
,Zibo 255049
, China
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X. T. Wei,
X. T. Wei
School of Mechanical Engineering,
Shandong University of Technology
,Zibo 255049
, China
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X. H. Yang,
X. H. Yang
School of Mechanical Engineering,
Shandong University of Technology
,Zibo 255049
, China
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Y. B. Guo
Y. B. Guo
1
Department of Mechanical Engineering,
e-mail: yguo@eng.ua.edu
The University of Alabama
,Tuscaloosa, AL 35487
e-mail: yguo@eng.ua.edu
1Corresponding author.
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X. Cheng
School of Mechanical Engineering,
Shandong University of Technology
,Zibo 255049
, China
X. T. Wei
School of Mechanical Engineering,
Shandong University of Technology
,Zibo 255049
, China
X. H. Yang
School of Mechanical Engineering,
Shandong University of Technology
,Zibo 255049
, China
Y. B. Guo
Department of Mechanical Engineering,
e-mail: yguo@eng.ua.edu
The University of Alabama
,Tuscaloosa, AL 35487
e-mail: yguo@eng.ua.edu
1Corresponding author.
Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received January 1, 2014; final manuscript received June 28, 2014; published online August 6, 2014. Assoc. Editor: Donggang Yao.
J. Manuf. Sci. Eng. Oct 2014, 136(5): 051013 (7 pages)
Published Online: August 6, 2014
Article history
Received:
January 1, 2014
Revision Received:
June 28, 2014
Citation
Cheng, X., Wei, X. T., Yang, X. H., and Guo, Y. B. (August 6, 2014). "Unified Criterion for Brittle–Ductile Transition in Mechanical Microcutting of Brittle Materials." ASME. J. Manuf. Sci. Eng. October 2014; 136(5): 051013. https://doi.org/10.1115/1.4027996
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