dynamic axial crush response of circular honeycombs by royan j. d'mello, sophia guntupalli,...

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