Low-velocity impact on sandwich beams with 2D curved re-entrant auxetic cores

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Tahmasebi Tahneh Zahra; Ranjbar Roeintan Mehdi

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: JOURNAL OF MECHANICAL ENGINEERING AMIRKABIR (AMIRKABIR) Year:2025 | Volume:57 | Issue:6 Page(s): 757-772

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Title

Low-velocity impact on sandwich beams with 2D curved re-entrant auxetic cores

Author(s)

Tahmasebi Tahneh Zahra | Ranjbar Roeintan Mehdi | Issue Writer Certificate

Keywords

Auxetic materials

curved unit cell

three-point bending test

drop-weight impact test

absorbed energy

Abstract

This research investigates the low-velocity impact on sandwich beams with 2D curved reentrant auxetic cores. Using a 3D printer, tensile test specimens are fabricated and their mechanical properties are extracted. In addition, using a 3D printer, sandwich beam specimens with 2D curved reentrant auxetic cores are fabricated, consisting of curved unit cells at angles of 30, 45, and 60 degrees. Three-point bending and drop-weight impact tests are performed on the specimens. Polylactic acid is used as the material for the beams. The findings from the three-point bending test show that increasing the internal angle of the curved unit cell corresponds to decreasing the slope of the linear portion of the graph and the amplitude of the applied bending force. The impact response history includes factors such as contact force, absorbed energy, impactor velocity, impactor displacement, and displacement of sandwich beams with 2D curved reentrant auxetic cores when subjected to a 3 J drop-weight impact test. Also, Poisson's ratio and relative density of 2D curved reentrant auxetic unit cells with angles of 30, 45, and 60 degrees are obtained. One of the important findings of the impact test is that in order to maximize energy absorption, sandwich beams with 2D curved reentrant auxetic cores with unit cells of 30 degrees angle perform best compared to other angles.

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