Investigation of trapezoidal corrugated aramid/epoxy laminates under large tensile displacements transverse to the corrugation direction

Thermal properties of highly structured composite and aluminium sheets in an aerodynamic tunnel

“…They are used as a semi-finished product [4,5]. From the point of the heat transfer mechanism, the structured surfaces intensified the convection heat transfer rate due to higher surface area and the suitable flow behaviour around the structured metal sheets as referred in [5,6,7] their papers focuses on heat shield application which is typically used in automotive.…”

“…The structured sheets offer us for particular applications the possibility of influencing on mechanical parameters, not only in terms of stress distribution, but also change in stiffness, shifting of natural frequencies or even customization of aerodynamic properties. They are used as a semi-finished product [4,5]. From the point of the heat transfer mechanism, the structured surfaces intensified the convection heat transfer rate due to higher surface area and the suitable flow behaviour around the structured metal sheets as referred in [5,6,7] their papers focuses on heat shield application which is typically used in automotive.…”

Sandwich Structure Based On Corrugated-Core: A Review

“…Thill et al [32] investigated about trapezoidal corrugated aramid/epoxy laminates under huge tensile displacements transverse to the corrugation direction. Figure 5 shows trapezoidal corrugated-cores that have trapezium in shape with the angle.…”

Corrugation Reinforced Composites: A Method for Filling Holes in Material‐Property Space

“…Utilization of the corrugated geometry has been shown to have potential to increase the necking strain of a material as a result of the unbending of the corrugation during loading. As outlined in the review paper by Dayyani et al, [10] this improved elongation in the longitudinal direction coupled with high transverse stiffness has made the corrugated geometry an excellent candidate in the construction industry, the packaging industry in the form of corrugated board, as explored in Luo et al [11] and Gilchrist et al, [12] and more recently in the aerospace industry for use in morphing wings, as studied by Ge et al, [13] Xia et al, [14] Kress and Winkler, [15] Yokozeki et al, [16] and Park et al [17] Studies of isolated corrugations or corrugated sandwich structures by Thill et al, [18] Dayyani et al, [19] Bouaziz, [20] Boke, [21] and Fraser et al [22] found that when subjected to a tensile load the stress-strain response is characterized by initially low levels of stress followed by increasing work hardening behavior that can be attributed to the unbending corrugation, followed by normal plastic behavior of the material once the corrugation is straightened. Ultimately, this leads to the material necking at a larger value of strain compared to a straight sample.…”

“…It is worth noting at this time that this study strictly focuses on a sinusoidal corrugated structure. This sinusoidal corrugated geometry is commonly used in the study of corrugated materials, [12][13][14]18,[21][22][23][24][25][26][27][28][29][30][31] however it is not the only corrugated geometry used and many other studies use trapezoidal corrugations, [15,19,20] and circular corrugations. [14][15][16] All of these corrugation geometries display similar increasing work hardening behavior when loaded in tension and the main difference between the geometries lies in the manner and location in which the unbending is focused, the amount of force required to unbend to a certain degree and the corresponding strain at which complete unbending has occurred.…”