期刊
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
卷 110, 期 -, 页码 299-310出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijimpeng.2016.12.021
关键词
Impact; Ultra-high speed imaging; 2D digital image correlation; Full-field measurement; Virtual fields method
Full-field deformation response of a copper bar impacted in a three point bending setup is studied. Ultrahigh speed photography (frame rate: 5 x 10(6) fps) in conjunction with digital image correlation is utilized to study the in-plane deformation kinematics of the impacted specimen over 25.4 mu s duration after the impact. Distributions of temporal derivatives, i.e. strain rate, velocity and acceleration, over the area of interest are computed using the in-plane displacement and strain fields measured from image correlation. Complex deformation patterns resulting from wave propagation and inertial loading are studied and discussed. Having deformed the specimen well into the plastic regime, the idea initially proposed by Pierron et al. (2011) is extended to identify visco-plastic constitutive response of the examined material by incorporating an analysis based on the method of virtual fields. Accordingly, a strain rate sensitive constitutive model for the copper specimen is identified by reconstructing the inertia and the impact forces using full field acceleration and reaction force measurements, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
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