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ID 34790
file
creator
Yokoyama, Takashi
subject
Finite elements
Impact compression
Elastoplasticity
Viscoplastic response
Split Hopkinson pressure bar
Radial inertia
End friction
NDC
Mechanical engineering
abstract
The split Hopkinson pressure bar (SHPB) technique has been used widely for the impact testing of materials in the strain-rate range from 10(2) to 10(4) s(-1). However, some specific problems still remain mainly concerning the effects of radial inertia and end friction in a cylindrical specimen on the accurate determination of dynamic stress-strain curves of materials. In this study, the basic principle of the SHPB technique is revisited based on energy conservation and some modifications are made considering radial momentum conservation. It is pointed out that the radial inertia and end friction effects are coupled to each other in the SHPB specimen. Computational simulations using the commercial finite element (FE) code ABAQUS/Explicit ver. 6.8 are conducted to check the validity of the modifications for ductile pure aluminum specimens. Both rate-independent and rate-dependent models are adopted for the test material. Simulations are performed by varying two different control parameters: a friction coefficient between the specimen and the pressure bars and a slenderness ratio of the specimen (or thickness to diameter ratio).
journal title
Mechanics of Materials
volume
Volume 51
start page
97
end page
109
date of issued
2012
publisher
Elsevier B.V.
issn
0167-6636
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
(c) 2012 Elsevier B.V. All rights reserved.
relation url
department
Graduate School of Engineering