期刊论文详细信息
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES 卷:139
Experimental characterization of compaction wave propagation in cellular polymers
Article
Ravindran, Suraj1  Koohbor, Behrad1  Malchow, Peter1  Kidane, Addis1 
[1] Univ South Carolina, Dept Mech Engn, Room A132,300 Main St, Columbia, SC 29208 USA
关键词: Polymer foam;    Wave propagation;    Direct impact;    Digital image correlation;    Compaction;   
DOI  :  10.1016/j.ijsolstr.2018.02.003
来源: Elsevier
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【 摘 要 】

A great-deal of literature is available in the study of compaction wave propagation in cellular materials. However, experimental investigations concerning the spatial variation of the deformation features of compaction waves are limited. In this study, the formation and propagation of compaction wave in a low density polymeric foam under intermediate velocity projectile impact loading is investigated experimentally. The results are discussed in terms of the compaction wave characteristic parameters such as compaction wave velocity, axial strain, particle velocity, etc. In addition, spatial distribution of inertia stress during compaction wave propagation, and the critical velocity required to form shock are estimated. The stress jump across the compaction wave is also calculated using an inertia stress analysis and compared with the shock theory. It was observed that an elastic precursor propagates, at a velocity of 740 m/s, along the material upon impact, and it decays as it propagates along the specimen. Whereas, the compaction wave formed following the elastic precursor was propagated at a constant velocity much slower than the elastic precursor. Inertia stress calculations shows that the fast moving elastic precursor is reflected from the distal end and reduces the inertia component of the total stress. On the other hand, the compaction thickness is seen to be approximately constant during the entire duration of the compaction wave propagation after the achievement of the quasi-steady condition. (C) 2018 Elsevier Ltd. All rights reserved.

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