Axial crushing and transverse bending responses of sandwich structures with lattice core

Abstract

The performance of sandwich structure with expanded metal sheets as the core was studied under axial crushing and transverse impact bending. Relationships between the force and displacement at the mid-span of the sandwich beams were obtained from the experiments. Numerical simulations were carried out using ABAQUS/EXPLICIT and the results were thoroughly compared with the experimental results. Then, the influence of the cell orientation and size of the cell were investigated. It was shown that the cell orientation was a critical parameter affecting the failure mode and energy absorption capability, leading to the increase in the peak load and specific energy absorption during the axial crushing tests. Specific energy absorption of the sandwich beams with lattice core under axial crushing ranges from 117 to 2934 J/kg, which is higher than that of beams under transverse bending. The results showed that the increase in cell angle up to ϴ = 90 increased the energy absorption by 624.4%. It was found that effects of the cell size and cell orientation on the energy absorption were dependent on each other governing the low-velocity impact response of the sandwich beams with lattice cores.

Static and dynamic response of sandwich beams with lattice and pantographic cores

“…A lot of variants of the lattice core geometry (pyramidal, hourglass, auxetic, Kagome structures, etc.) have been suggested for the sandwich shells, panels and beams [1][2][3][9][10][11]. Impact strength of sandwich structures with lattice cores have been intensively investigated and compared with other type of the cores (see, e.g.…”

Fatigue behavior of flush reinforced welded hand-holes in aluminum light poles

“…Taghipoor and Damghani Nouri found that an increase in the cell angle of sandwich beams with an expanded metal core, up to θ = 90 degrees, increased axial and bending energy absorption by 624.4%. Numerical situations were also carried out using ABAQUS/EXPLCIT and the results were compared to the experimental data [11]. In a separate study, the same authors found that an increase in the size of the expanded metal cell core within a reasonable range improved the performance of a structure under bending collapse [12].…”

Fabrication and compression properties of continuous carbon fiber reinforced polyether ether ketone thermoplastic composite sandwich structures with lattice cores

“…Various fabrication techniques including investment casting [9], metal folding [10] and extrusion [11], interlocking assembly [12] and hot-pressing molding [13] were exploited. Meanwhile, the properties of the compression [14,15], shear [16,17], bending [18,19], impact resistance [20,21] and multifunction [22,23] are deeply investigated to comprehensively evaluate the lattice sandwich structures.…”