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TECHNICAL PAPERS

Experimental Investigation on the Plasticity of Hexagonal Aluminum Honeycomb Under Multiaxial Loading

[+] Author and Article Information
Dirk Mohr, Mulalo Doyoyo

Impact and Crashworthiness Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Appl. Mech 71(3), 375-385 (Jun 22, 2004) (11 pages) doi:10.1115/1.1683715 History: Received March 25, 2003; Revised July 23, 2003; Online June 22, 2004
Copyright © 2004 by ASME
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References

Figures

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Top view of the sandwich specimen before being bonded to the second grip plate. The insert shows a schematic of a single honeycomb cell. The shaded rectangle highlights the nature of the microstructure.
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Schematic of the sandwich specimen
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Schematic of the universal biaxial testing device (UBTD)
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Photograph of the UBTD (front view): 1-movable grip plate, 2-universal joint, 3-rotating specimen holder (top), 4-positioning clamp (top), 5-roller bearing, 6-sandwich specimen, 7-fixed grip plate, 8-vertical guidance rod, 9-rotating specimen holder (bottom), 10-positioning clamp (bottom), 11-top plate, 12-bottom plate, 13-LVDT, 14-vertical load cell (movable crosshead), and 15-table of fixed cross-head
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Detail of how the horizontal load cell is integrated into the top plate (labels are consistent with the captions of Fig. 4)
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Vertical force (MTS load cell) versus vertical displacement (LVDT) for tests under 60 deg loading. The encircled region highlights an example for minor drops in the load curve while the test was paused for image acquisition.
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Plots of the horizontal forces measured during tests under 60 deg loading. Note the two groups of curves: The upper and lower groups represent the recording of the horizontal force in the bottom plate and top plate, respectively.
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Linear strain paths for various biaxial loading angles. The transition curve labeled χ=1 cuts the domain into the expected compression and tension regimes.
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Normal stress-strain curve for large biaxial loading angles. The corresponding pictures for 60 and 80deg are shown in Fig. 12 and Fig. 13, respectively.
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Shear stress-strain curve for large biaxial loading angles. The corresponding pictures for 60 deg are shown in Fig. 12.
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Shear stress versus normal stress curve for selected large biaxial loading angles (60,80 deg)
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A sequence of photographs of hexagonal aluminum honeycomb during biaxial loading at 60 deg angle at different resultant displacements. Note the development of collapse bands into plastic folds under load. The measurements next to each figure represent the magnitudes of the resultant displacement at each picture point.
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A sequence of photographs of hexagonal aluminum honeycomb during biaxial loading at 80 deg angle at different resultant displacements. Note the development of collapse bands into plastic folds under load. The measurements next to each figure represent the magnitudes of the resultant displacement at each picture point.
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Normal stress-strain curve for low biaxial loading angles. Note that all data points 0 deg lie on the ordinate axis. The corresponding pictures for 0deg and 30 deg are shown in Fig. 16 and Fig. 17, respectively.
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Shear stress-strain curve for low biaxial loading angles. The corresponding pictures for 0 and 30 deg are shown in Fig. 16 and Fig. 17, respectively.
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A sequence of photographs of hexagonal aluminum honeycomb during biaxial loading at 0 deg angle at different resultant displacements. The measurements next to each figure represent the magnitudes of the resultant displacement at each picture point.
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A sequence of photographs of hexagonal aluminum honeycomb during biaxial loading at 30 deg angle at different resultant displacements. The measurements next to each figure represent the magnitudes of the resultant displacement at each picture point.
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Representative photographs of collapse mechanisms of the compression-dominated crushing illustrated with the observations made at 60 deg loading
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Initial collapse and crushing envelopes in stress space. The square dots are experimental data points. The vectors indicate the direction of plastic flow during crushing, whereas the dashed straight lines starting from the origin prescribe the direction of plastic flow according to the simplified flow rule given by Eq. (15).

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