A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Out-of-plane compressive response of aluminum honeycomb sandwich panels: Adhesive geometry and bonding effects
https://orcid.org/0000-0002-4138-2768
Highlights Out-of-plane stress-strain response of a sandwich panel differs from that of cellular core. Adhesive height determines densification initiation strain. Method correctly characterizes densification region, accounts for adhesive effect. Significant energy absorbed in the densification region for panels with adhesive. Larger fillets reduced the overall absorbed energy due to lower densification initiation strains.
Abstract Lightweight aluminum honeycomb sandwich panels are widely used in industrial engineering, particularly in aircraft applications. Due to their thin-walled nature, the honeycomb cell walls are especially susceptible to buckling under out-of-plane compressive loading, while the adhesive fillet that secures the honeycomb to the face-sheet remains intact. This paper investigates the effect of the adhesive geometry and bonding constraints on the out-of-plane compressive response through experimental, Finite Element (FE), and mathematical methods. A hybrid method accounting for adhesive bonding between the face-sheet and the cell walls, and different adhesive fillet geometries was proposed to predict strain onset and stress-strain relationships during densification. The resulting stress-strain curves predicted the energy absorbed by the panels to within 3.5 % of the experimental results. The widely used material model for honeycomb core does not account for densification and underpredicted the absorbed energy by 15.6 %. These findings emphasize the need for detailed adhesive analysis in the design of lightweight, thin-walled sandwich structures.
Out-of-plane compressive response of aluminum honeycomb sandwich panels: Adhesive geometry and bonding effects
https://orcid.org/0000-0002-4138-2768
Highlights Out-of-plane stress-strain response of a sandwich panel differs from that of cellular core. Adhesive height determines densification initiation strain. Method correctly characterizes densification region, accounts for adhesive effect. Significant energy absorbed in the densification region for panels with adhesive. Larger fillets reduced the overall absorbed energy due to lower densification initiation strains.
Abstract Lightweight aluminum honeycomb sandwich panels are widely used in industrial engineering, particularly in aircraft applications. Due to their thin-walled nature, the honeycomb cell walls are especially susceptible to buckling under out-of-plane compressive loading, while the adhesive fillet that secures the honeycomb to the face-sheet remains intact. This paper investigates the effect of the adhesive geometry and bonding constraints on the out-of-plane compressive response through experimental, Finite Element (FE), and mathematical methods. A hybrid method accounting for adhesive bonding between the face-sheet and the cell walls, and different adhesive fillet geometries was proposed to predict strain onset and stress-strain relationships during densification. The resulting stress-strain curves predicted the energy absorbed by the panels to within 3.5 % of the experimental results. The widely used material model for honeycomb core does not account for densification and underpredicted the absorbed energy by 15.6 %. These findings emphasize the need for detailed adhesive analysis in the design of lightweight, thin-walled sandwich structures.
Out-of-plane compressive response of aluminum honeycomb sandwich panels: Adhesive geometry and bonding effects
https://orcid.org/0000-0002-4138-2768
Highlights Out-of-plane stress-strain response of a sandwich panel differs from that of cellular core. Adhesive height determines densification initiation strain. Method correctly characterizes densification region, accounts for adhesive effect. Significant energy absorbed in the densification region for panels with adhesive. Larger fillets reduced the overall absorbed energy due to lower densification initiation strains.
Abstract Lightweight aluminum honeycomb sandwich panels are widely used in industrial engineering, particularly in aircraft applications. Due to their thin-walled nature, the honeycomb cell walls are especially susceptible to buckling under out-of-plane compressive loading, while the adhesive fillet that secures the honeycomb to the face-sheet remains intact. This paper investigates the effect of the adhesive geometry and bonding constraints on the out-of-plane compressive response through experimental, Finite Element (FE), and mathematical methods. A hybrid method accounting for adhesive bonding between the face-sheet and the cell walls, and different adhesive fillet geometries was proposed to predict strain onset and stress-strain relationships during densification. The resulting stress-strain curves predicted the energy absorbed by the panels to within 3.5 % of the experimental results. The widely used material model for honeycomb core does not account for densification and underpredicted the absorbed energy by 15.6 %. These findings emphasize the need for detailed adhesive analysis in the design of lightweight, thin-walled sandwich structures.
Out-of-plane compressive response of aluminum honeycomb sandwich panels: Adhesive geometry and bonding effects
Sun, Mengqian (author) / Kendall, Patrick (author) / Wowk, Diane (author) / Mechefske, Christopher (author) / Kim, Il Yong (author)
Thin-Walled Structures ; 196
2023-12-17
Article (Journal)
Electronic Resource
English
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