Mechanics of controlled fragmentation by cold drawing
Cold drawing is a mature and widely adopted technique in the shaping of metallic and polymeric materials in industry. Interestingly, cold drawing of a ductile cladding containing a brittle core wire or a ductile substrate supporting a deposited brittle film has recently emerged as a method to produc...
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sg-ntu-dr.10356-1568382022-05-05T01:30:06Z Mechanics of controlled fragmentation by cold drawing Li, Dong Wang, Zhixun Chen, Ming Wei, Lei Gao, Huajian School of Electrical and Electronic Engineering School of Mechanical and Aerospace Engineering Institute of High Performance Computing, A*STAR Engineering::Electrical and electronic engineering Cold Drawing Necking Cold drawing is a mature and widely adopted technique in the shaping of metallic and polymeric materials in industry. Interestingly, cold drawing of a ductile cladding containing a brittle core wire or a ductile substrate supporting a deposited brittle film has recently emerged as a method to produce micron sized rods and ribbons through controlled fragmentation induced by local necking. While this method shows tremendous potential in providing an economic yet efficient technological platform for large-scale manufacturing of structures at the micro- and nanoscale, there is so far no theoretical guideline on how to control the size of the fragmented components. Here, we develop a theory of controlled fragmentation in cold drawing of both axisymmetric core-cladding and plane-strain film-substrate systems. The theory reveals that the process is governed by a reverse shear lag effect which gives rise to a peak tensile stress leading to controlled fragmentation near the necking zone, where the material properties of both the brittle core/film and ductile cladding/substrate play critical roles. Of particular interest is how the feature size of the fragmented components can be reduced toward the nanoscale. To this end, our theory shows that the fragmentation size mainly depends on the interfacial shear strength, geometrical dimension and stiffness of the brittle material, and can be reduced via increasing the strength of interfacial interactions and/or decreasing geometrical dimensions such as the core radius or film thickness. Agency for Science, Technology and Research (A*STAR) Ministry of Education (MOE) Nanyang Technological University Submitted/Accepted version D.L. and H.G. acknowledge a research start-up grant (002479-00001) from Nanyang Technological University and the Agency for Science, Technology and Research (A*STAR) and the use of the National Supercomputing Centre, Singapore (NSCC). This work was also supported by a graduate fellowship to D.L. from China Scholarship Council (CSC). M.C acknowledges the financial support from the National Nature Science Foundation of China (11804354). L.W. acknowledges the financial support from Singapore Ministry of Education Academic Research Fund Tier 2 (MOE2019-T2-2-127 and T2EP50120-0005), and A*STAR under AME IRG (A2083c0062) . 2022-05-05T01:30:05Z 2022-05-05T01:30:05Z 2022 Journal Article Li, D., Wang, Z., Chen, M., Wei, L. & Gao, H. (2022). Mechanics of controlled fragmentation by cold drawing. Journal of the Mechanics and Physics of Solids, 159, 104726-. https://dx.doi.org/10.1016/j.jmps.2021.104726 0022-5096 https://hdl.handle.net/10356/156838 10.1016/j.jmps.2021.104726 2-s2.0-85120460994 159 104726 en 002479-00001 MOE2019-T2-2-127 T2EP50120-0005 A2083c0062 Journal of the Mechanics and Physics of Solids 10.21979/N9/GLVZ2A © 2021 Elsevier Ltd. All rights reserved. This paper was published in Journal of the Mechanics and Physics of Solids and is made available with permission of Elsevier Ltd. application/pdf |
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Engineering::Electrical and electronic engineering Cold Drawing Necking Li, Dong Wang, Zhixun Chen, Ming Wei, Lei Gao, Huajian Mechanics of controlled fragmentation by cold drawing |
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Cold drawing is a mature and widely adopted technique in the shaping of metallic and polymeric materials in industry. Interestingly, cold drawing of a ductile cladding containing a brittle core wire or a ductile substrate supporting a deposited brittle film has recently emerged as a method to produce micron sized rods and ribbons through controlled fragmentation induced by local necking. While this method shows tremendous potential in providing an economic yet efficient technological platform for large-scale manufacturing of structures at the micro- and nanoscale, there is so far no theoretical guideline on how to control the size of the fragmented components. Here, we develop a theory of controlled fragmentation in cold drawing of both axisymmetric core-cladding and plane-strain film-substrate systems. The theory reveals that the process is governed by a reverse shear lag effect which gives rise to a peak tensile stress leading to controlled fragmentation near the necking zone, where the material properties of both the brittle core/film and ductile cladding/substrate play critical roles. Of particular interest is how the feature size of the fragmented components can be reduced toward the nanoscale. To this end, our theory shows that the fragmentation size mainly depends on the interfacial shear strength, geometrical dimension and stiffness of the brittle material, and can be reduced via increasing the strength of interfacial interactions and/or decreasing geometrical dimensions such as the core radius or film thickness. |
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School of Electrical and Electronic Engineering |
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School of Electrical and Electronic Engineering Li, Dong Wang, Zhixun Chen, Ming Wei, Lei Gao, Huajian |
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Article |
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Li, Dong Wang, Zhixun Chen, Ming Wei, Lei Gao, Huajian |
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Li, Dong |
title |
Mechanics of controlled fragmentation by cold drawing |
title_short |
Mechanics of controlled fragmentation by cold drawing |
title_full |
Mechanics of controlled fragmentation by cold drawing |
title_fullStr |
Mechanics of controlled fragmentation by cold drawing |
title_full_unstemmed |
Mechanics of controlled fragmentation by cold drawing |
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mechanics of controlled fragmentation by cold drawing |
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2022 |
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https://hdl.handle.net/10356/156838 |
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1734310120022605824 |