A Study on the Explosive Resistance of Sandwich Panels with a New Negative Poisson Bowtie Core

Document Type : Original Article

Authors

1 Assistant Professor,, Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, Iran

2 Associate Professor, Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, Iran

3 MSc, Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, Iran

Abstract

The selection of materials, geometry, and structures resistant to explosive loading plays an important role in the stability of the structure and minimizing human and financial losses in critical situations such as war. Therefore, in this study, in order to investigate the impact and resistance of sandwich panels with traditional negative Poisson bowtie cores against explosive loading and with the aim of reducing damage, old sandwich panels have been modeled in the Abaqus finite element software. And then, inspired by the traditional bowtie structure, a new symmetrical lattice structure with negative Poisson ratio and used as the core of a sandwich panel between two metal surfaces has been designed and modeled. Two main criteria, the internal angle and the thickness of the sheet forming the acoustic microstructures, have been evaluated as effective factors in the explosive resistance of sandwich panels. The explosive resistance of sandwich panel samples with traditional and new cores has been investigated under a load of 300 grams of TNT at a distance of 10 centimeters from the center of the upper face of the sandwich panel. The results indicate a decrease in the negative Poisson's ratio due to an increase in the thickness of the bowtie cell sheet and an increase in the internal angle of the microstructures forming the core. The highest value of the negative Poisson's ratio, 0.514, was obtained in the internal sample with an internal angle of 50 degrees and a sheet thickness of 0.6 mm. The results indicate a significant decrease in the stress on the foundation and an increase in the response time of the structure due to an increase in the negative Poisson's ratio and isotropic performance. The maximum stress on the foundation in the sample with an isotropic internal angle of 50 degrees decreased by more than one third compared to the sample with the same traditional angle. The reduction in stress on the foundation at an internal angle of 60 degrees was more noticeable in the traditional and new cores. The findings of this study can be a good guide for developers and researchers active in the field of structural reinforcement.

Keywords

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Passive Defense
Volume 16, Issue 4 - Serial Number 64
Serial number 64. Winter 2026
February 2026
Pages 57-69

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History

  • Receive Date: 22 May 2025
  • Revise Date: 28 September 2025
  • Accept Date: 23 November 2025
  • Publish Date: 19 February 2026

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