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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.
Source PublicationJOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
2014-12-15
Volume73Pages:84-102
ISSN0022-5096
AbstractHigh 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.
KeywordDynamic Large Strain Extrusion Machining High Speed Machining Thermo-plastic Instability Shear Band Spacing Momentum Diffusion
Subject AreaMaterials Science ; Mechanics ; Physics
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000347023600007
Funding OrganizationThis 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.
DepartmentLNM冲击动力学与新型材料力学性能
Classification一类
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49565
Collection非线性力学国家重点实验室
Corresponding AuthorDai, 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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