期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 48, 期 5, 页码 687-697出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2010.11.005
关键词
Honeycombs; Combined shear-compression; Hopkinson bars; Dynamic strength enhancement
类别
资金
- 111 project of China [1307050]
- National Science Foundation of China [10932008]
This paper presents a combined shear-compression impact test for soft cellular materials designed in order to investigate their behavior under impact multiaxial loadings. A large-diameter Nylon Split Hopkinson Pressure Bar system (SHPB) with beveled ends of different angles is used to apply the desired shear-compression combinations. The data processing methods are studied and validated by virtual testing data generated with FEM simulations. A series of experiments on an aluminum honeycomb were performed at the impact velocity of about 15 m/s with the loading angles ranging from 0 (corresponding to the pure compression) to 60 degrees. It shows a strong effect of the additional shear loading because both the initial peak and the crush strength decrease with increasing loading angles. The quasi-static shear-compression experiments were also performed using the same beveled ends on a universal INSTRON machine and a notable strength enhancement under impact loading is observed. Images captured during quasi-static and impact tests permit for the determination of the two co-existing deforming patterns under combined shear-compression and reveal the influence of the loading rate on the occurrence of these two patterns. (C) 2010 Elsevier Ltd. All rights reserved.
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