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2014 | OriginalPaper | Buchkapitel

10. Blast Response of Sandwich Composites: Effect of Core Gradation, Pre-loading, and Temperature

verfasst von : N. Gardner, S. Gupta, E. Wang, Arun Shukla

Erschienen in: Blast Mitigation

Verlag: Springer New York

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Abstract

The dynamic behavior of various sandwich composites made of E-glass vinyl-ester facesheets, Corecell™ foam, and polyurea have been studied using a shock tube apparatus. The effects of core gradation, pre-loading, and temperature have been investigated. The overall dimensions of the specimens were held constant, with the only differences arising in the overall thickness of the core. During the shock tube testing, high-speed photography coupled with the nonintrusive optical technique of 3-D DIC was utilized to capture the real-time deformation process, as well as failure mechanisms. Postmortem analysis was carried out to evaluate the overall blast performance of these sandwich composites. Results indicated that (1) increasing the number of monotonically graded core layers reduces the impedance mismatch between successive layers, allowing for a stepwise compression of the core, and thus reduces the strength of the incoming stress wave. (2) The location of the polyurea interlayer has a significant positive effect on the response of composite panels to shock wave loading, both in terms of failure mitigation and energy absorption, if it is placed opposite the blast-receiving side. (3) In-plane compressive loading coupled with the transverse blast loading induces local buckling in the front facesheet, with the amount of damage proportional to the level of compressive loading. (4) The blast performance of sandwich composites at room temperature (22 °C) is superior to its performance at high temperatures (80 °C) and low temperatures (−40 °C).

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Titel: Blast Response of Sandwich Composites: Effect of Core Gradation, Pre-loading, and Temperature
verfasst von: N. Gardner
S. Gupta
E. Wang
Arun Shukla
Verlag: Springer New York
Buch: Blast Mitigation
Print ISBN: 978-1-4614-7266-7

Electronic ISBN: 978-1-4614-7267-4

Copyright-Jahr: 2014
DOI: https://doi.org/10.1007/978-1-4614-7267-4_10

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