High strain rate and high temperature response of two armour steels: Experimental testing and constitutive modelling
Under ballistic impact or blast loading, the high strain rate and high temperature behaviour of armour steels is key to their response to a given threat. This experimental and numerical investigation examines the tensile response of a class 4a improved rolled homogenous armour steel (IRHA) and a hig...
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2018-01-01
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Series: | EPJ Web of Conferences |
Online Access: | https://doi.org/10.1051/epjconf/201818301022 |
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doaj-a413e3b2a9434444a9d5d5bdcbcbecd02021-08-02T08:25:25ZengEDP SciencesEPJ Web of Conferences2100-014X2018-01-011830102210.1051/epjconf/201818301022epjconf_dymat2018_01022High strain rate and high temperature response of two armour steels: Experimental testing and constitutive modellingMcDonald BrodieBornstein HuonAmeri AliEscobedo-Diaz Juan P.Orifici Adrian C.Under ballistic impact or blast loading, the high strain rate and high temperature behaviour of armour steels is key to their response to a given threat. This experimental and numerical investigation examines the tensile response of a class 4a improved rolled homogenous armour steel (IRHA) and a high hardness armour steel (HHA). Cylindrical tensile specimens were tested at a range of strain rates from 0.001 s-1 to 2700 s-1. Quasi-static, elevated temperature tests were performed from room temperature up to 300° C. While the HHA is strain rate insensitive, the IRHA displays a significant increase in strength across the range of loading rates reducing the ultimate strength difference between the materials from 19% at 0.001s-1 to 4.6% at 2700s-1. An inverse numerical modelling approach for constitutive model calibration is presented, which accurately captured the dynamic material behaviour. The modified Johnson-Cook strength and Cockcroft-Latham (C-L) fracture models were capable of predicting the ballistic limit of each material to within 5% of the experimental result and to within 10% for deformation under blast loading. The blast rupture threshold of both materials was significantly over-estimated by the C-L model suggesting stress state or strain rate effects may be reducing the ductility of armour steel under localised blast loading.https://doi.org/10.1051/epjconf/201818301022 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
McDonald Brodie Bornstein Huon Ameri Ali Escobedo-Diaz Juan P. Orifici Adrian C. |
spellingShingle |
McDonald Brodie Bornstein Huon Ameri Ali Escobedo-Diaz Juan P. Orifici Adrian C. High strain rate and high temperature response of two armour steels: Experimental testing and constitutive modelling EPJ Web of Conferences |
author_facet |
McDonald Brodie Bornstein Huon Ameri Ali Escobedo-Diaz Juan P. Orifici Adrian C. |
author_sort |
McDonald Brodie |
title |
High strain rate and high temperature response of two armour steels: Experimental testing and constitutive modelling |
title_short |
High strain rate and high temperature response of two armour steels: Experimental testing and constitutive modelling |
title_full |
High strain rate and high temperature response of two armour steels: Experimental testing and constitutive modelling |
title_fullStr |
High strain rate and high temperature response of two armour steels: Experimental testing and constitutive modelling |
title_full_unstemmed |
High strain rate and high temperature response of two armour steels: Experimental testing and constitutive modelling |
title_sort |
high strain rate and high temperature response of two armour steels: experimental testing and constitutive modelling |
publisher |
EDP Sciences |
series |
EPJ Web of Conferences |
issn |
2100-014X |
publishDate |
2018-01-01 |
description |
Under ballistic impact or blast loading, the high strain rate and high temperature behaviour of armour steels is key to their response to a given threat. This experimental and numerical investigation examines the tensile response of a class 4a improved rolled homogenous armour steel (IRHA) and a high hardness armour steel (HHA). Cylindrical tensile specimens were tested at a range of strain rates from 0.001 s-1 to 2700 s-1. Quasi-static, elevated temperature tests were performed from room temperature up to 300° C. While the HHA is strain rate insensitive, the IRHA displays a significant increase in strength across the range of loading rates reducing the ultimate strength difference between the materials from 19% at 0.001s-1 to 4.6% at 2700s-1. An inverse numerical modelling approach for constitutive model calibration is presented, which accurately captured the dynamic material behaviour. The modified Johnson-Cook strength and Cockcroft-Latham (C-L) fracture models were capable of predicting the ballistic limit of each material to within 5% of the experimental result and to within 10% for deformation under blast loading. The blast rupture threshold of both materials was significantly over-estimated by the C-L model suggesting stress state or strain rate effects may be reducing the ductility of armour steel under localised blast loading. |
url |
https://doi.org/10.1051/epjconf/201818301022 |
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