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Experimental investigation of the dynamic behavior of metaconcrete

Kettenbeil, Christian and Ravichandran, Guruswami (2018) Experimental investigation of the dynamic behavior of metaconcrete. International Journal of Impact Engineering, 111 . pp. 199-207. ISSN 0734-743X. http://resolver.caltech.edu/CaltechAUTHORS:20170929-115811998

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Abstract

A study investigating the dynamic material behavior of a new type of heterogeneous composite called metaconcrete is presented. Instead of sand, stone and gravel in a conventional concrete, the metaconcrete mortar is filled with heavy, spherical aggregates that are encapsulated in a soft coating. This locally resonant metamaterial exhibits band gaps that lead to the attenuation of applied stress waves at the inclusion’s eigenfrequencies. Plate impact experiments are conducted to investigate the viability of the underlying physical concepts for the attenuation of stress waves. To reduce the effects of porosity and inhomogeneity, the mortar material is substituted by an epoxy matrix and a lead core encapsulated in polyurethane serves as the aggregate. Strain gauges applied between the aggregates on the specimen surface are used to evaluate the performance of the metaconcrete microstructure. Initial conditions were varied with respect to impact velocities (18 m/s - 100 m/s) and flyer plate thickness (0.8 mm - 25.4 mm) to study the dependence of the attenuation properties for a range of impact configurations. Moreover, the resonant frequency of the aggregates was measured using high-speed photography and digital image correlation (DIC) and shown to be in good agreement with analytical predictions. The metaconcrete microstructure lead to a reduction in maximum strain of up to 72% compared to a homogeneous epoxy specimen, showing the potential for metaconcrete to be used in damage mitigation of structures subjected to dynamic stress wave loading.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.ijimpeng.2017.09.017DOIArticle
http://www.sciencedirect.com/science/article/pii/S0734743X16308193PublisherArticle
Additional Information:© 2017 Elsevier Ltd. Received 17 October 2016, Revised 22 June 2017, Accepted 27 September 2017, Available online 28 September 2017. We gratefully acknowledge the support from the Air Force Office of Scientific Research Grant No. FA9550-12-1-0091 through the University Center of Excellence in High-Rate Deformation Physics of Heterogeneous Materials. The present study was inspired by the works of Stephanie Mitchell, Anna Pandolfi and Michael Ortiz on concrete [3,4,31,32].Moreover, the authors wish to thank Dr. Owen Kingstedt and Dr. Michael Mello for their help in preparing this manuscript.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0091
Subject Keywords:Metamaterials; Stress wave attenuation; Concrete; Plate impact experiments; High-speed photography
Record Number:CaltechAUTHORS:20170929-115811998
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170929-115811998
Official Citation:Christian Kettenbeil, Guruswami Ravichandran, Experimental investigation of the dynamic behavior of metaconcrete, In International Journal of Impact Engineering, Volume 111, 2018, Pages 199-207, ISSN 0734-743X, https://doi.org/10.1016/j.ijimpeng.2017.09.017. (http://www.sciencedirect.com/science/article/pii/S0734743X16308193)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:81923
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Sep 2017 20:57
Last Modified:13 Dec 2017 17:49

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