Dynamic and quasi-static propagation of compaction waves in a low-density epoxy foam

• Published in: Experimental mechanics 2006-04, Vol.46 (2), p.127-136
• Main Authors: SONG, B, FORRESTAL, M. J, CHEN, W
• Format: Article
• Language: English
• Subjects: Exact sciences and technology; Fundamental areas of phenomenology (including applications); Measurement and testing methods; Physics; Solid mechanics; Structural and continuum mechanics; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
• ISSN: 0014-4851; 1741-2765
• DOI: 10.1007/s11340-006-5871-4

We conducted dynamic and quasi-static compression experiments with low-density (rho = 120 kg/m) 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.