On the development of new test techniques to measure the tensile response of materials at high and ultra-high strain rates
File(s)
Author(s)
Zhou, Junyi
Tagarielli, Vito
Type
Journal Article
Abstract
Background: There is a lack of reliable methods to obtain valid measurements of the tensile
response of high performance materials such as fibre composites, ceramics and textile products
at high rates of strain. Objective: We propose and assess two new test techniques aimed at
measuring valid tensile stress versus strain curves at high and ultra-high strain rates. Methods:
We conduct detailed, non-linear explicit Finite Element (FE) simulations of the transient
response of the test apparatus and specimen during the tests and we develop simple analytical
models to interpret the test measurements. We consider two test techniques: one based on the
split Hopkinson bar apparatus, and suitable for strain rates of up to 1000 /s, and a second
technique relying on ballistic impact and aimed at measurements at strain rates higher than
1000 /s. Results: The simulations are successfully validated using test data at strain rates of
order 200 /s and then used to predict the test performance at strain rates up to approximately
5500 /s. We find that both techniques can give valid stress versus strain curves across a wide
range of strain rates. Conclusions: We identify the limits of both techniques and recommend
optimal measurement strategies for dynamic testing of materials with different ductility.
response of high performance materials such as fibre composites, ceramics and textile products
at high rates of strain. Objective: We propose and assess two new test techniques aimed at
measuring valid tensile stress versus strain curves at high and ultra-high strain rates. Methods:
We conduct detailed, non-linear explicit Finite Element (FE) simulations of the transient
response of the test apparatus and specimen during the tests and we develop simple analytical
models to interpret the test measurements. We consider two test techniques: one based on the
split Hopkinson bar apparatus, and suitable for strain rates of up to 1000 /s, and a second
technique relying on ballistic impact and aimed at measurements at strain rates higher than
1000 /s. Results: The simulations are successfully validated using test data at strain rates of
order 200 /s and then used to predict the test performance at strain rates up to approximately
5500 /s. We find that both techniques can give valid stress versus strain curves across a wide
range of strain rates. Conclusions: We identify the limits of both techniques and recommend
optimal measurement strategies for dynamic testing of materials with different ductility.
Date Issued
2022-01-01
Date Acceptance
2021-08-16
Citation
Experimental Mechanics, 2022, 62, pp.151-164
ISSN
0014-4851
Publisher
Society for Experimental Mechanics (SEM)
Start Page
151
End Page
164
Journal / Book Title
Experimental Mechanics
Volume
62
Copyright Statement
© The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/
License URL
Sponsor
Engineering & Physical Science Research Council (E
The Royal Society
Office Of Naval Research (USA)
Grant Number
AESZ_P44345
RG130267
W911NF1810386
Subjects
Science & Technology
Technology
Materials Science, Multidisciplinary
Mechanics
Materials Science, Characterization & Testing
Materials Science
Tensile testing
Ultra-high strain rate
Ballistic impact
Ceramics
Composites
Fibres
FRAGMENTATION
DYNAMICS
NECKING
PLATES
FOAMS
BLAST
0905 Civil Engineering
0913 Mechanical Engineering
0915 Interdisciplinary Engineering
Mechanical Engineering & Transports
Publication Status
Published
Date Publish Online
2021-09-16