Prediction of maximum strain and strain rate in SHPB specimens based on energy analysis

The split Hopkinson pressure bar (SHPB) technique developed by H. Kolsky has been widely used to determine stress-strain curves of materials at strain rates from 102 to 104 s'. In the SHPB method, it is usually impossible to predict the maximum strain and strain rate obtainable in the spec...

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Main Author:	Nurizzatul Atikha, Rahmat
Format:	Thesis
Language:	English
Published:	2013
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/7675/1/NURIZZATUL_ATIKHA_BINTI_RAHMAT.PDF
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id	my-ump-ir.7675
record_format	uketd_dc
spelling	my-ump-ir.76752021-08-18T05:09:48Z Prediction of maximum strain and strain rate in SHPB specimens based on energy analysis 2013 Nurizzatul Atikha, Rahmat TA Engineering (General). Civil engineering (General) The split Hopkinson pressure bar (SHPB) technique developed by H. Kolsky has been widely used to determine stress-strain curves of materials at strain rates from 102 to 104 s'. In the SHPB method, it is usually impossible to predict the maximum strain and strain rate obtainable in the specimen before testing even if an impact velocity of a striker bar, diameters and acoustic impedances (pc) of the Hopkinson bars and the specimen geometry are specified. This is because the strain rate dependence of test materials is unknown' until the SHPB tests are conducted. The objective of the present work is to predict the maximum plastic strain and strain rate in the SHPB specimen based on the energy analysis using rate-independent plasticity. Two different material models are used to express the rate-independent mechanical behavior of the test materials. The present energy analysis enables one to approximately estimate the maximum plastic strain and strain rate in the SHPB specimen in advance from the static properties of the test materials. The prediction accuracy of the energy analysis is checked by comparison with the experimental results for three high-strength aluminum alloys obtained from the SHPB tests. It is demonstrated that the maximum strain and strain rate in the SHPB specimens are slightly overestimated by the energy analysis due to the neglect of the kinetic energy within them. 2013 Thesis http://umpir.ump.edu.my/id/eprint/7675/ http://umpir.ump.edu.my/id/eprint/7675/1/NURIZZATUL_ATIKHA_BINTI_RAHMAT.PDF application/pdf en public masters Japan , Okayama University Graduate School of Engineering
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Nurizzatul Atikha, Rahmat Prediction of maximum strain and strain rate in SHPB specimens based on energy analysis
description	The split Hopkinson pressure bar (SHPB) technique developed by H. Kolsky has been widely used to determine stress-strain curves of materials at strain rates from 102 to 104 s'. In the SHPB method, it is usually impossible to predict the maximum strain and strain rate obtainable in the specimen before testing even if an impact velocity of a striker bar, diameters and acoustic impedances (pc) of the Hopkinson bars and the specimen geometry are specified. This is because the strain rate dependence of test materials is unknown' until the SHPB tests are conducted. The objective of the present work is to predict the maximum plastic strain and strain rate in the SHPB specimen based on the energy analysis using rate-independent plasticity. Two different material models are used to express the rate-independent mechanical behavior of the test materials. The present energy analysis enables one to approximately estimate the maximum plastic strain and strain rate in the SHPB specimen in advance from the static properties of the test materials. The prediction accuracy of the energy analysis is checked by comparison with the experimental results for three high-strength aluminum alloys obtained from the SHPB tests. It is demonstrated that the maximum strain and strain rate in the SHPB specimens are slightly overestimated by the energy analysis due to the neglect of the kinetic energy within them.
format	Thesis
qualification_level	Master's degree
author	Nurizzatul Atikha, Rahmat
author_facet	Nurizzatul Atikha, Rahmat
author_sort	Nurizzatul Atikha, Rahmat
title	Prediction of maximum strain and strain rate in SHPB specimens based on energy analysis
title_short	Prediction of maximum strain and strain rate in SHPB specimens based on energy analysis
title_full	Prediction of maximum strain and strain rate in SHPB specimens based on energy analysis
title_fullStr	Prediction of maximum strain and strain rate in SHPB specimens based on energy analysis
title_full_unstemmed	Prediction of maximum strain and strain rate in SHPB specimens based on energy analysis
title_sort	prediction of maximum strain and strain rate in shpb specimens based on energy analysis
granting_institution	Japan , Okayama University
granting_department	Graduate School of Engineering
publishDate	2013
url	http://umpir.ump.edu.my/id/eprint/7675/1/NURIZZATUL_ATIKHA_BINTI_RAHMAT.PDF
_version_	1783731942870482944

Prediction of maximum strain and strain rate in SHPB specimens based on energy analysis

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