Dynamic and Quasi-Static Propagation of Compaction Waves in a Low-Density Epoxy Foam |
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Authors: | B Song M J Forrestal W Chen |
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Institution: | (1) School of Aeronautics and Astronautics, Purdue University, West Lafayette, IN 49707-2023, USA;(2) Sandia National Laboratories, Albuquerque, NM 87185-0482, USA;(3) Schools of Aeronautics/Astronautics and Materials Engineering, Purdue University, West Lafayette, IN 47907-2023, USA |
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Abstract: | We conducted dynamic and quasi-static compression experiments with low-density (ρ = 120 kg/m3) epoxy foam specimens. The specimens had a 10.0-mm-square cross-section and a length of 19.3 mm. Dynamic experiments were
conducted with a modified split Hopkinson pressure bar (SHPB), and the quasi-static experiments were conducted with a hydraulic
load frame device (MTS-810). In both cases, the specimens were loaded from one end at a constant velocity. Equally spaced
grid lines were marked on the specimens to monitor the deformation history. Digital images taken at equally spaced time intervals
gave the positions of each grid line. These images showed that a constant end-face velocity V produced a compaction wave front that traveled at a constant velocity C in both dynamic and quasi-static experiments. We described these results with a shockwave analysis that used a locking solid
material model. |
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Keywords: | Epoxy foam Compaction wave Split Hopkinson pressure bar (SHPB) Quasi-static testing Locking solid material model |
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