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    On the Mechanics of Chip Segmentation In Machining

    Source: Journal of Manufacturing Science and Engineering:;1981:;volume( 103 ):;issue: 001::page 33
    Author:
    R. Komanduri
    ,
    R. H. Brown
    DOI: 10.1115/1.3184458
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The mechanics of chip segmentation, during machining of a cold rolled steel has been investigated from a phenomenological point of view using a high speed movie camera and an explosive quick stop device. The latter was used for obtaining chip root samples at various stages of segmentation for subsequent examination in the Optical and Scanning Electron Microscope (SEM). The chip segmentation process is found to arise as a result of instabilities in the cutting process and is further augmented by the dynamic response of part of the machine tool structure. This process involves a slow forward movement of the plastic boundary in the primary shear zone forming a ramp on the free surface of the chip followed by a rapid return of the plastic boundary back towards the tool forming a step on the chip segment as a result of partial fracture at the free surface. This process is characterized by large strains, low shear angles that oscillate cyclically and stick-slip friction on the rake face. The instability in the cutting process is proposed to be due to the negative stress—strain characteristics of certain materials at large strains, as Walker and Shaw [1] proposed, involving void formation around second phase particles, their propagation into microcracks in the primary shear zone and coalescence of these cracks leading to partial fracture. Evidence for this has been obtained in this investigation.
    keyword(s): Machining , Image segmentation , Shear (Mechanics) , Fracture (Process) , Cutting , Dynamic response , Machine tools , Steel , Scanning electron microscopes , Particulate matter , Stress , Microcracks , Stick-slip , Explosives AND Friction ,
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      On the Mechanics of Chip Segmentation In Machining

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    contributor authorR. Komanduri
    contributor authorR. H. Brown
    date accessioned2017-05-08T23:11:36Z
    date available2017-05-08T23:11:36Z
    date copyrightFebruary, 1981
    date issued1981
    identifier issn1087-1357
    identifier otherJMSEFK-27688#33_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/94827
    description abstractThe mechanics of chip segmentation, during machining of a cold rolled steel has been investigated from a phenomenological point of view using a high speed movie camera and an explosive quick stop device. The latter was used for obtaining chip root samples at various stages of segmentation for subsequent examination in the Optical and Scanning Electron Microscope (SEM). The chip segmentation process is found to arise as a result of instabilities in the cutting process and is further augmented by the dynamic response of part of the machine tool structure. This process involves a slow forward movement of the plastic boundary in the primary shear zone forming a ramp on the free surface of the chip followed by a rapid return of the plastic boundary back towards the tool forming a step on the chip segment as a result of partial fracture at the free surface. This process is characterized by large strains, low shear angles that oscillate cyclically and stick-slip friction on the rake face. The instability in the cutting process is proposed to be due to the negative stress—strain characteristics of certain materials at large strains, as Walker and Shaw [1] proposed, involving void formation around second phase particles, their propagation into microcracks in the primary shear zone and coalescence of these cracks leading to partial fracture. Evidence for this has been obtained in this investigation.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleOn the Mechanics of Chip Segmentation In Machining
    typeJournal Paper
    journal volume103
    journal issue1
    journal titleJournal of Manufacturing Science and Engineering
    identifier doi10.1115/1.3184458
    journal fristpage33
    journal lastpage51
    identifier eissn1528-8935
    keywordsMachining
    keywordsImage segmentation
    keywordsShear (Mechanics)
    keywordsFracture (Process)
    keywordsCutting
    keywordsDynamic response
    keywordsMachine tools
    keywordsSteel
    keywordsScanning electron microscopes
    keywordsParticulate matter
    keywordsStress
    keywordsMicrocracks
    keywordsStick-slip
    keywordsExplosives AND Friction
    treeJournal of Manufacturing Science and Engineering:;1981:;volume( 103 ):;issue: 001
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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