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Corrugated-core sandwich panels are efficient protective structures that can absorb blast/impact energy through plastic deformation. A relatively non-expensive folding technique is used to manufacture the core to different topologies. Literature survey revealed that the dynamic response of metallic trapezoidal corrugated-core sandwich panels subjec...
Contexts in source publication
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... on the testing scheme presented in Figures 3c and 3d, the two panels were glued to the top surface of the concrete (Figure 5a). When the 3 rd detonation was first performed, the panel (with mass of 45.2 kg) was lifted and shifted 17.6 m away from the explosion location. ...
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... the 3 rd detonation was first performed, the panel (with mass of 45.2 kg) was lifted and shifted 17.6 m away from the explosion location. The panel frame and the layers were also separated (Figure 5b). A circular local punching shear fail ure is the dominant behavior of the panel through all its 8 layers (Figures 5c-e). ...
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... panel frame and the layers were also separated (Figure 5b). A circular local punching shear fail ure is the dominant behavior of the panel through all its 8 layers (Figures 5c-e). The adjacent panel, at this stage showed minor deformations due to the 3 rd detonation (Figure 5b). ...
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... circular local punching shear fail ure is the dominant behavior of the panel through all its 8 layers (Figures 5c-e). The adjacent panel, at this stage showed minor deformations due to the 3 rd detonation (Figure 5b). When the 4 th detonation was then performed, a similar panel behavior was observed, although the IED was in a complete contact with the frontal layer of the panel. ...
Context 5
... on the testing scheme presented in Figures 3c and 3d, the two panels were glued to the top surface of the concrete (Figure 5a). When the 3 rd detonation was first performed, the panel (with mass of 45.2 kg) was lifted and shifted 17.6 m away from the explosion location. ...
Context 6
... the 3 rd detonation was first performed, the panel (with mass of 45.2 kg) was lifted and shifted 17.6 m away from the explosion location. The panel frame and the layers were also separated (Figure 5b). A circular local punching shear fail ure is the dominant behavior of the panel through all its 8 layers (Figures 5c-e). ...
Context 7
... panel frame and the layers were also separated (Figure 5b). A circular local punching shear fail ure is the dominant behavior of the panel through all its 8 layers (Figures 5c-e). The adjacent panel, at this stage showed minor deformations due to the 3 rd detonation (Figure 5b). ...
Context 8
... circular local punching shear fail ure is the dominant behavior of the panel through all its 8 layers (Figures 5c-e). The adjacent panel, at this stage showed minor deformations due to the 3 rd detonation (Figure 5b). When the 4 th detonation was then performed, a similar panel behavior was observed, although the IED was in a complete contact with the frontal layer of the panel. ...
Citations
... In that investigation, the ability to dissipate energy from the blast load through the plastic deformations of the core layer of the sandwich panel was compared using performance indicators. The publications [3,4] present experimental and numerical results for sandwich panels (considered sacrificial elements) with various unconnected corrugated core layers made of aluminium. One of the outcomes of this research was the conclusion that this type of sandwich panel should not be considered a protection element in the case of close-in detonation. ...
The article presents sandwich panels subjected to blast wave impact and accelerated fragments. The research discusses results obtained from original experimental setups that fill a gap in the area of investigation of the mechanical response of sandwich panels used in civil engineering applications under accidental design situations such as blast wave impact and/or fragment penetration. In field experiments, a high-speed camera was used to record both the fragment trajectory and the deflection of the sandwich panel. The authors proposed the equivalent static load for both the global analysis of the sandwich panel and the calibration of the numerical model. In FE modelling, CONWEP algorithm was used to simulate blast wave impact, and ductile damage model material to allow perforation of the sandwich panel faces. The convergence of mesh size was analyzed. For the validated numerical model, an evaluation of the effect of the size of the fragment (diameter/mass) on the outlet velocity and the size of the inlet and outlet holes was carried out.
... The use of damping systems in protective structures has been well-investigated numerically [3][4][5][6] and experimentally [7][8][9] by researchers in this field. Impact absorbing damping systems can range from springs, cellular structures, foam metals and sandwich panels (with auxetic or nonauxetic metamaterials) [8,[10][11][12][13][14][15][16][17]. ...
... The use of damping systems in protective structures has been well-investigated numerically [10][11][12][13] and experimentally [14,15] by researchers in this field. Impact absorbing damping systems can range from springs, cellular structures, foam metals and sandwich panels (with auxetic or non-auxetic metamaterials) [15][16][17][18][19][20][21][22][23]. ...
... 0860-6897.2023.2.15 Due to their high longitudinal stretching, shear strengths, and energy absorption qualities, corrugated core sandwich panels have been suggested as an appealing substitute for cellular cores [28][29][30]. The corrugated layers are created using a folding process [31,32]. Geometric topologies can range from; but not limited to; triangular, sinusoidal, rectangular, and trapezoidal topologies. ...
Sandwich panels have the potential to serve as plastically deforming sacrificial structures that can absorb blast or impact energies. Auxetic sandwich panels with welded or bolted corrugated layers have, as far as the author is aware, had their blast behaviour thoroughly addressed in the literature. Therefore, the objective of this numerical analysis was to create a novel, low-cost, simple-to-build graded sandwich panel with detached corrugated layers that may be employed as a multi-purpose sacrificial protective structure against a wide range of blast threats. The suggested sandwich panel has overall dimensions of 330x330x150mm and is made of six detached aluminium (AL6063-T4) layers enclosed in a steel (Weldox 460E) frame. With different stepwise plate thicknesses of 0.4, 0.8, and 1.2mm for each pair of layers, the six layers all have the same re-entrant auxetic geometry. Utilising the Abaqus/Explicit solver, the numerical analysis was carried out. A wide variety of blast intensities (4, 7, 11, 13, and 16 MPa peak reflected overpressures) were tested on the suggested auxetic sandwich panel, and the results showed uniform progressive collapse, a superior decrease in reaction forces, and greater energy dissipation compared to comparable non-auxetic topologies. The innovative sandwich panel design has potential uses for both military and civic structures that need to be protected.
... Sandwich panels can be utilised as blast absorbing sacrificial structures using their plastic deformation potential [1,2]. To the authors' knowledge, sandwich panels with connected (welded or bolted) corrugated layers has been well investigated by researchers [3]. ...
Sandwich panels can be utilised as blast absorbing sacrificial structures using their plastic deformation potential. To the authors’ knowledge, sandwich panels with connected (welded or bolted) corrugated layers has been well investigated by researchers. Therefore, the objective of this study is to create a new, inexpensive, graded sandwich panel with "unconnected" corrugated layers that can be utilised as a multipurpose sacrificial protective structure against a variety of blast threats. The geometry and the selection of the trapezoidal topology was based on the parametric study conducted earlier by the authors. Methodology consists of laboratory testing of the used steel and aluminium materials (18 dog-bone samples) followed by quasi-static compression testing of the 3 fabricated sandwich panels. Based on laboratory outcomes, a non-linear numerical model was developed using Abaqus FE software. Load-deformation curves, plateau stress, energy absorption, stress values, reaction forces, and damage, are among the key parameters that were recorded from the numerical and laboratory analysis. The development of this new sandwich panel may have a great importance to public safety, as those sacrificial panels can be used to retrofit the frontal façade of sensitive buildings.
... Various research on blast wave propagation was conducted by Stoller in [5,6] and resistance of structures against such loads was researched in [7][8][9]. A field test that focused on overpressure measurements of various types of explosives was described in [10][11][12][13]. ...
Most of the damage caused by an explosion is caused by a pressure effect. The magnitude of the pressure generated by the explosion is influenced by the external characteristics of the environment (surrounding objects, their arrangement, geometry, etc.) and internal characteristics (type of explosive, type of charge, booster and others). An effective combination of internal factors creates a symmetry that results in the highest possible value of pressure generated by the charge explosion. The paper focuses on the influence of the booster reaction on this symmetry. The scope of the paper is to understand the dependency of the blast wave pressure on the amount of used blaster to increase the efficacy of explosions on the environment and structures to increase the protection of affected structures. The open-air field tests were conducted using different types of explosives: trinitrotoluene and three different types of industrially made ANFO explosives (pure ammonium nitrate and fuel oil, ammonium nitrate and fuel oil plus aluminum powder, ammonium nitrate and fuel oil mixed with trinitrotoluene). The obtained data were compared with the analytical approach for setting the generated maximal pressure on the front of the blast wave.
