Inelastic deformation micromechanism and modified fragmentation model for silicon carbide under dynamic compression

Wang, Z., Li, P. and Song, W. (2018) Inelastic deformation micromechanism and modified fragmentation model for silicon carbide under dynamic compression. Materials and Design, 157, pp. 244-250. (doi:10.1016/j.matdes.2018.07.032)

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Abstract

The underlying micromechanism remains to be clarified for the bulk inelastic behaviour of specific ceramics under impact loads. In this study, the silicon carbide materials were subjected to the split-Hopkinson pressure bar compression in which the strain rate was not constant but increased to the dynamic level at high stresses. The inelastic deformation occurs in the high strain rate stage in compression, followed by the final transgranular fracture. The post-test fragments were examined in both the SEM and high resolution TEM. It was found that macroscopic inelastic behaviour is dominated by the dislocation motion and the localised amorphisation that arise at high strain rates. The damage and thus the degraded modulus in the dynamic inelastic deformation were incorporated to modify a dynamic fragmentation model to evaluate the fragment size as a function of strain rates. The modified model more accurately predicts the size of fragments produced at high strain rates.

Item Type:Articles
Additional Information:The authors gratefully acknowledge the financial support of Academic Research Fund (AcRF) Tier 1 by Ministry of Education in Singapore, the National Key Research and Development Programme of China (2016YFC0801200) and the National Natural Science Foundation of China (11672043 and 11521062). ZW thanks the Research Student Scholarship by Nanyang Technological University in Singapore where this work was conducted.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Li, Dr Peifeng
Authors: Wang, Z., Li, P., and Song, W.
College/School:College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:Materials and Design
Publisher:Elsevier
ISSN:0264-1275
ISSN (Online):1873-4197
Published Online:17 July 2018
Copyright Holders:Copyright © 2018 Elsevier Ltd.
First Published:First published in Materials and Design 157: 244-250
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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