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Measurement methods for the determination of powder properties for compaction modelling. / Dzmitry Korachkin

Swansea University Author: Dzmitry Korachkin

Abstract

In this thesis an experimental investigation into the measurement methods for determination of model parameters for the compaction, unloading and ejection stages and a numerical investigation on the effects of fill density distribution are presented. The numerical investigation explored the effect o...

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Published: 2006
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42288
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first_indexed 2018-08-02T18:54:20Z
last_indexed 2018-08-03T10:09:45Z
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spelling 2018-08-02T16:24:28.6981882 v2 42288 2018-08-02 Measurement methods for the determination of powder properties for compaction modelling. 1a0d5a5083ff3c13463377a675d78e32 NULL Dzmitry Korachkin Dzmitry Korachkin true true 2018-08-02 In this thesis an experimental investigation into the measurement methods for determination of model parameters for the compaction, unloading and ejection stages and a numerical investigation on the effects of fill density distribution are presented. The numerical investigation explored the effect of fill density distribution on green density in powder compacts and on tool forces. This was achieved by comparing the results of simulations with uniform and non-uniform fill density distributions. The investigation considered three different powder types (ferrous, hard metal and ceramic), a selection of different geometries and a selection of fill density distributions based on the review of die filling research. Non-uniform fill density was found to result in higher density variation and in increased tool forces. A novel floating die modification to the shear plate friction measurement apparatus has been proposed. The equipment was used to measure the friction coefficient for a wide range of loading conditions, where the compaction and normal load have been explored independently. For ferrous powders friction was found to reduce with the compaction load and for lower compaction pressures also with normal load. Admixed and die wall lubricant performance was also assessed, with even small quantities providing significant reduction in friction. The compact surface was examined in a bid to explore the friction mechanisms with regards to lubrication. A review of different experimental techniques for measurement of parameters for the unloading and ejection stages is presented. The instrumented die, the unconstrained compression, the three point bending and the Brazilian disc tests have been explored for a selection of powders. A correction function has been proposed to enable the measurement of radial pressure in the instrumented die during ejection. A novel split die modification to the instrumented die test has been introduced and used to explore the axial recovery during ejection. E-Thesis Materials science.;Mechanical engineering. 31 12 2006 2006-12-31 COLLEGE NANME Engineering COLLEGE CODE Swansea University Doctoral Ph.D 2018-08-02T16:24:28.6981882 2018-08-02T16:24:28.6981882 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Dzmitry Korachkin NULL 1 0042288-02082018162442.pdf 10797996.pdf 2018-08-02T16:24:42.6470000 Output 33647520 application/pdf E-Thesis true 2018-08-02T16:24:42.6470000 false
title Measurement methods for the determination of powder properties for compaction modelling.
spellingShingle Measurement methods for the determination of powder properties for compaction modelling.
Dzmitry Korachkin
title_short Measurement methods for the determination of powder properties for compaction modelling.
title_full Measurement methods for the determination of powder properties for compaction modelling.
title_fullStr Measurement methods for the determination of powder properties for compaction modelling.
title_full_unstemmed Measurement methods for the determination of powder properties for compaction modelling.
title_sort Measurement methods for the determination of powder properties for compaction modelling.
author_id_str_mv 1a0d5a5083ff3c13463377a675d78e32
author_id_fullname_str_mv 1a0d5a5083ff3c13463377a675d78e32_***_Dzmitry Korachkin
author Dzmitry Korachkin
author2 Dzmitry Korachkin
format E-Thesis
publishDate 2006
institution Swansea University
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description In this thesis an experimental investigation into the measurement methods for determination of model parameters for the compaction, unloading and ejection stages and a numerical investigation on the effects of fill density distribution are presented. The numerical investigation explored the effect of fill density distribution on green density in powder compacts and on tool forces. This was achieved by comparing the results of simulations with uniform and non-uniform fill density distributions. The investigation considered three different powder types (ferrous, hard metal and ceramic), a selection of different geometries and a selection of fill density distributions based on the review of die filling research. Non-uniform fill density was found to result in higher density variation and in increased tool forces. A novel floating die modification to the shear plate friction measurement apparatus has been proposed. The equipment was used to measure the friction coefficient for a wide range of loading conditions, where the compaction and normal load have been explored independently. For ferrous powders friction was found to reduce with the compaction load and for lower compaction pressures also with normal load. Admixed and die wall lubricant performance was also assessed, with even small quantities providing significant reduction in friction. The compact surface was examined in a bid to explore the friction mechanisms with regards to lubrication. A review of different experimental techniques for measurement of parameters for the unloading and ejection stages is presented. The instrumented die, the unconstrained compression, the three point bending and the Brazilian disc tests have been explored for a selection of powders. A correction function has been proposed to enable the measurement of radial pressure in the instrumented die during ejection. A novel split die modification to the instrumented die test has been introduced and used to explore the axial recovery during ejection.
published_date 2006-12-31T03:52:40Z
_version_ 1763752605853417472
score 11.013731

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