| Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining | |
Cai SL ; Dai LH(戴兰宏); Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
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| Source Publication | JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
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| 2014-12-15 | |
| Volume | 73Pages:84-102 |
| ISSN | 0022-5096 |
| Abstract | High speed machining (HSM) is an advanced production technology with great future potential. Chip serration or segmentation is a commonly observed phenomenon during high speed machining of metals, which is found to be ascribed to a repeated shear band formation fueled by thermo-plastic instability occurring within the primary shear zone. The occurrence of serrated chips leads to the cutting force fluctuation, decreased tool life, degradation of the surface finish and less accuracy in machine parts during high speed machining. Hence, understanding and controlling serrated chip formation in HSM are extremely important. In this work, a novel dynamic large strain extrusion machining (DLSEM) technique is developed for suppressing formation of serrated chips. The systematic DLSEM experiments of Ti-6Al-4V and Inconel 718 alloy with varying degrees of imposed extrusion constraint were carried out. It is found that there is a prominent chip morphology transition from serrated to continuous state and shear band spacing decreases with the constraint degree increasing. In order to uncover underlying mechanism of the imposed extrusion constraint suppressing repeated adiabatic shear banding in DLSEM, new theoretical models are developed where the effects of extrusion constraint, material convection due to chip flow and momentum diffusion during shear band propagation are included. The analytical expressions for the onset criterion of adiabatic shear band and shear band spacing in DLSEM are obtained. The theoretical predictions are in agreement with the experimental results. (C) 2014 Elsevier Ltd. All rights reserved. |
| Keyword | Dynamic Large Strain Extrusion Machining High Speed Machining Thermo-plastic Instability Shear Band Spacing Momentum Diffusion |
| Subject Area | Materials Science ; Mechanics ; Physics |
| URL | 查看原文 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000347023600007 |
| Funding Organization | This work has been supported by the National Natural Science Foundation of China (Grant No. 11132011 and 11472287), the National Key Basic Research Program of China (Grant No. 2012CB937500) and the CAS/SAFEA International Partnership Program for Creative Research Teams. |
| Department | LNM冲击动力学与新型材料力学性能 |
| Classification | 一类 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/49564 |
| Collection | 非线性力学国家重点实验室 |
| Corresponding Author | Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
| Recommended Citation GB/T 7714 | Cai SL,Dai LH,Dai, LH . Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining[J]. JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,2014,73:84-102. |
| APA | Cai SL,戴兰宏,&Dai, LH .(2014).Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining.JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS,73,84-102. |
| MLA | Cai SL,et al."Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining".JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS 73(2014):84-102. |
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