dynamic axial crush response of circular honeycombs by royan j. d'mello, sophia guntupalli,...
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Dynamic axial crush response of circular honeycombs
by Royan J. D'Mello, Sophia Guntupalli, Lucas R. Hansen, and Anthony M. Waas
Proceedings AVolume ():rspa20110722
May 23, 2012
©2012 by The Royal Society
Diagram of the 3-cell and 7-cell circular polycarbonate honeycombs.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Micro-section of the contact site of two cells in the polycarbonate honeycombs as seen under an optical microscope.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Schematic showing the experimental set-up of the wave loading device (WLD).
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Typical rest–ramp displacement of the incident bar at the specimen end.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Plot showing the initial deformation response of the 3-cell specimen under dynamic crush loading using the WLD method.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Images of the initial stages of deformation in a 3-cell specimen loaded in the WLD set-up from t=0 to t=0.2 ms.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Plot showing the initial deformation response of the 7-cell specimen under dynamic crush loading using the WLD set-up.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Images of the initial stages of deformation in a 7-cell specimen loaded in the WLD setup from t=0 to t=0.2 ms.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Schematic showing the set-up for the direct impact method (DIM).
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Load–time plot of the 3-cell specimen when impacted directly by the striker bar.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Load–time plot of a 3-cell specimen when directly impacted by a striker bar.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Load–time plot of a 7-cell specimen when directly impacted by a striker bar.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Diagram showing the boundary conditions used on the honeycomb during eigenbuckling analysis.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Eigenmodes for 3-cell and 7-cell specimens that are chosen to perturb the mesh for explicit FE simulations.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
The rate-dependent compressive behaviour of polycarbonate taken from Mulliken & Boyce (2006).
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Images from the FE dynamic crush simulation of 3-cell and 7-cell models with WLD inputs.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
(a) Load–time plot obtained from the FE simulations (WLD method) of 7-cell honeycombs of varying amounts of geometrical imperfections.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Images from the FE dynamic crush simulation of 3-cell and 7-cell models with loading velocity 5000 mm s−1 (DIM simulation).
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Load–time plot (shown on the left-hand axix) obtained from the FE simulation for the 7-cell honeycomb model with varying amounts of geometrical imperfections being crushed at the rate
of 5000 mm s−1 (DIM simulation).
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Plot showing the variation of material strain rate and normalized plateau load per cell with crush velocity for 3-cell and 7-cell models.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society
Plot showing the FE-simulated crush and peak load values that are normalized by number of cells for 3-cell, 4-cell, 7-cell, 13-cell and 19-cell specimens.
Royan J. D'Mello et al. Proc. R. Soc. A doi:10.1098/rspa.2011.0722
©2012 by The Royal Society