Abstract
An improved pyramidal prefolded pattern was designed and applied to thin-walled tubes. This delicately designed pattern modularizes the tube to control the folding process and act as an inducer to trigger deformation modes with outstanding crushing performance. Dynamic crushing tests were conducted numerically; the simulation results reveal that the patterned square tube developed a deformation mode with shorter wavelength, better load consistencies, and higher energy-absorption efficiency (up to 29%) than that of the traditional counterpart. Moreover, geometric analysis was performed and structural improvements were conducted by applying the optimal geometric parameters onto an octagonal profile. The designed patterned octagonal tube collapsed into a highly efficient deformation mode known as diamond mode. Furthermore, the comparative results show that patterned octagonal tubes demonstrated an energy absorption up to 90.1% higher than that of a conventional square column while improving the geometric compliance. These findings enrich research on patterned tubes and provide new explorations for the development of high-performance energy-absorbing structures.
Highlights
Energy dissipating components, which commonly comprise metal tubes, are used to govern the passive safety of transport vehicles
Singace and El-Sobky [27] experimentally studied the effect on the mechanical responses of corrugations in aluminum and PVC circular columns, whereas Daneshi and Hosseinipour [28] investigated the effect on the axial crushing resistance of grooves on circular steel tubes. ey Advances in Materials Science and Engineering found that introducing corrugations or grooves helped control the folding patterns to some extent and improve load uniformity but decreased the specific energy absorption
To trigger this efficient mode Ma et al [31] designed a square tube with diamond-shaped rigid origami patterns; this effect was experimentally verified by Zhou et al [32], and their results demonstrated that triggering the efficient diamond mode was difficult and that the deformation mode was very sensitive to initial defects caused by manufacturing processes
Summary
Energy dissipating components, which commonly comprise metal tubes, are used to govern the passive safety of transport vehicles. E reasons are as follows: their modular structure makes the folding process controllable; the prefolded pattern, equivalent to an initial imperfection, reduces the peak force and can induce specific deformation modes with excellent energy-absorption efficiency. Ey attempted two types of patterns constructed by pyramidal elements and found an efficient buckling mode, known as the octagonal mode (or diamond mode), which is, sensitive to the ratio of tube width to wall thickness, B/t To trigger this efficient mode Ma et al [31] designed a square tube with diamond-shaped rigid origami patterns; this effect was experimentally verified by Zhou et al [32], and their results demonstrated that triggering the efficient diamond mode was difficult and that the deformation mode was very sensitive to initial defects caused by manufacturing processes. To determine the relationship between key parameters and the energy-absorption performance of tubes patterned with the designed structures under axial compression, numerical simulations were performed, as discussed
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