Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining

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	Suppression of repeated adiabatic shear banding by dynamic large strain extrusion machining
	Cai SL; Dai LH(戴兰宏)
刊名	JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
	2014-12-15
通讯作者邮箱	lhdai@lnm.imech.ac.cn
卷号	73 页码:84-102
关键词	Dynamic large strain extrusion machining High speed machining Thermo-plastic instability Shear band spacing Momentum diffusion
ISSN号	0022-5096
通讯作者	Dai, LH (reprint author), Chinese Acad Sci, Inst Mech, Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
产权排序	[Cai, S. L.; Dai, L. H.] Chinese Acad Sci, Inst Mech, Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
合作状况	国内
中文摘要	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.
学科主题	Materials Science; Mechanics; Physics
分类号	一类
收录类别	SCI ; EI
资助信息	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.
原文出处	http://dx.doi.org/10.1016/j.jmps.2014.09.004
语种	英语
WOS记录号	WOS:000347023600007
公开日期	2015-03-11
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/49565]
专题	力学研究所_非线性力学国家重点实验室
推荐引用方式 GB/T 7714	Cai SL,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.(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.