An analysis of the changes in geometry of a short hollow cylinder during axial compression

Hawkyard, J. B.; Johnson, W.

doi:10.1016/0020-7403(67)90027-6

Cited by 106 publications

(27 citation statements)

References 3 publications

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“…Different from calibration curves derived from experimental testing [2], the theoretical calibration curves were constructed by analyzing the ring compression on the assumption of uniform deformation using an optimum upper bound method [7] and a stress analysis approach [8]. Although the accuracy was improved by introducing small deformation increments [9], the theoretical data still did not agree well with the results obtained from experiments.…”

Section: Introductionmentioning

confidence: 53%

A new measuring method for friction factor by using ring with inner boss compression test

Yin

Zhao

et al. 2017

International Journal of Mechanical Sciences

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A new measuring method for friction factor by using ring with inner boss compression test. International Journal of Mechanical Sciences,[123][124][125][126][127][128][129][130][131][132][133][134][135][136][137][138][139][140] Access from the University of Nottingham repository: http://eprints.nottingham.ac.uk/42863/1/Ring%20compression%20with%20inner %20boss_AAM_IJMS.pdf Copyright and reuse:The Nottingham ePrints service makes this work by researchers of the University of Nottingham available open access under the following conditions. This article is made available under the Creative Commons Attribution Non-commercial No Derivatives licence and may be reused according to the conditions of the licence. For more details see: http://creativecommons.org/licenses/by-nc-nd/2.5/ A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractTo overcome the disadvantage of the bulging effect due to non-uniform deformation in dimension measurement of the conventional ring compression test (RCT), a new measuring method for the friction factor called ring compression test with inner boss (RCT-IB) was proposed. The compression behavior of the ring with an inner boss was investigated and results showed that the change of inner boss was sensitive to friction. The non-concave profile of inner boss allows the dimensional changes to be easily and precisely measured. The calibration curves of RCT-IB were constructed and compared with those of RCT showing similar level of sensitivities at most friction conditions. The RCT-IB method was successfully used to measure the friction factors under four different lubricating conditions. KeywordsFriction factor; Ring compression test; Ring compression test with inner boss; Calibration curves IntroductionFriction at the tool-workpiece interface has significant effects on the metal flow, forming load, surface quality and tool life in metal forming processes. Friction condition is also an important input parameter in simulating metal forming 2 processes using commercial or in-house codes. Therefore, the friction condition mostly defined by the friction factor should be quantitatively assessed in the design and evaluation of metal forming processes. The ring compression test (RCT), which was firstly proposed by Kunogi [1] and further developed by Mal...

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Section: Introductionmentioning

confidence: 53%

A new measuring method for friction factor by using ring with inner boss compression test

Yin

Zhao

et al. 2017

International Journal of Mechanical Sciences

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“…8 are elaborated according to the numerical results. Figure 8 illustrates the Hawkyard and Johnson [29] presented that the neutral layer may be within the material of the ring giving radially inward and outward flow (as shown in Fig. 3c), or it may be within the bore giving only outward (as shown in Fig.…”

Section: Effect Of Loading Speed and Forming Temperaturementioning

confidence: 99%

Friction factor evaluation by FEM and experiment for TA15 titanium alloy in isothermal forming process

Zhang

Yang

et al. 2011

Int J Adv Manuf Technol

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The friction at die-workpiece interface is an important parameter in metal forming processes, which affects the metal flow, cavity fill, surface quality, etc. The friction in the forming process is influenced by material properties and forming conditions. The friction in forming process of TA15 (Ti-6Al-2Zr-1Mo-1V) titanium alloy under high temperatures (isothermal forming) and low strain rates is studied here by ring compression test. The friction calibration curves are elaborated by means of finite element method. The research on the calibration curves and friction factor at the loading speed v=0.1-1.0 mm/s and the conventional forging temperature (950°C) and near-beta forging temperature (970°C) is carried out. The influence of loading speed on friction calibration curves is similar to the influence on friction factor m: at the low (m about 0.7) friction condition, the influence of loading speed can be ignored, however the influence is notable in the midst magnitude (about 0.2-0.5). The temperature variation from 950°C to 970°C has little influence on friction calibration curves, but has notable influence on m under lubricated condition.

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“…Mathematical expressions relating the change in internal diameter of a ring specimen after forging to the frictional restraint acting at the interface have been formulated by Avitzur 3 , Hawkyard and Johnson 5 and also by Burgdorf 6 . The analyses of Avitzur and of Hawkyard and Johnson are based on the concept of a constant interface friction shear factor defining the frictional restraint whereas the analysis of Burgdorf is based on the concept of a constant coefficient of friction.…”

Section: Mm^mmmi^imentioning

confidence: 99%

The Evaluation of Glasses As Forging Lubricants

Male¹,

Gurney²,

Jones³

1971

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An analysis of the changes in geometry of a short hollow cylinder during axial compression

Cited by 106 publications

References 3 publications

A new measuring method for friction factor by using ring with inner boss compression test

A new measuring method for friction factor by using ring with inner boss compression test

Friction factor evaluation by FEM and experiment for TA15 titanium alloy in isothermal forming process

The Evaluation of Glasses As Forging Lubricants

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