Protecting concrete structures from high energetic dynamic events such as blasts and impact is a major concern, in both civil- and military-related applications. Most conventional techniques fail to counter the unpredictable nature of dynamic loads, as well as the complex response of structures due to stress wave propagation. Hence, this paper explores the possibility of using a functionally graded—according to impedance—metallic composite system as a protective mechanism to a concrete structure. An analytical framework was developed using matlab, based on elastic and shock wave propagation theories, especially incorporating multiple interactions within the composite system, as well as reflections of free surfaces. A numerical analysis was carried out using the advanced finite element code LS-DYNA. The main objective of this paper was to compare the performance of the composite system against the conventional monolithic system.

References

References
1.
Li
,
Q. M.
,
Reid
,
S. R.
,
Wen
,
H. M.
, and
Telford
,
A. R.
,
2005
, “
Local Impact Effects of Hard Missiles on Concrete Targets
,”
Int. J. Impact Eng.
,
32
(
1–4
), pp.
224
284
.
3.
US Department of Defence
,
2008
, ,
US DoD
,
Washington DC
.
4.
Tan
,
S. H.
,
Poon
,
J. K.
,
Chan
,
R.
, and
Chng
,
D.
,
2012
, “
Retrofitting of Reinforced Concrete Beam-Column via Steel Jackets Against Close-In Detonation
,”
12th International LS-DYNA® Conference
,
Detroit
,
June 3–5
.
5.
Astarlioglu
,
S.
, and
Krauthammer
,
T.
,
2014
, “
Response of Normal-Strength and Ultra-High-Performance Fiber-Reinforced Concrete Columns to Idealized Blast Loads
,”
Eng. Struct.
,
61
, pp.
1
12
.
6.
Imbalzano
,
G.
,
Linforth
,
S.
,
Ngo
,
T. D.
,
Lee
,
P. V. S.
, and
Tran
,
P.
,
2018
, “
Blast Resistance of Auxetic and Honeycomb Sandwich Panels: Comparisons and Parametric Designs
,”
Compos. Struct.
,
183
, pp.
242
261
.
7.
Raman
,
S. N.
,
Ngo
,
T.
,
Mendis
,
P.
, and
Pham
,
T.
,
2012
, “
Elastomeric Polymers for Retrofitting of Reinforced Concrete Structures Against the Explosive Effects of Blast
,”
Adv. Mater. Sci. Eng.,
2012
, pp.
1
8
.
8.
Meyers
,
M. A.
,
2007
,
Dynamic Behavior of Materials
,
Wiley
,
New York
.
9.
Fernando
,
P. L. N.
,
Mohotti
,
D.
, and
Remennikov
,
A.
,
2019
, “
An Innovative Approach of Using Continuous Impedance-Graded Metallic Composite System for Attenuation of Stress Waves
,”
ASME J. Appl. Mech.
,
86
(6), p.
061002
.
10.
Zukas
,
J.
,
2004
,
Introduction to Hydrocodes
,
Elsevier
,
Boston
.
11.
Livermore Software Technology Corporation
,
2007
, “LS-DYNA Keyword User’s Manual,” Version R9.0, CA.
You do not currently have access to this content.