Quasi-static axial crushing performance of thin-walled tubes with circular hole discontinuities

Abstract

This paper investigates the crashworthiness performance of square pipes with induced holes. Glass reinforced epoxy (GFRP) specimens were fabricated and tested under quasi-static axial crashing. Four design parameters were chosen, each at three levels, to calculate crashworthiness indicators. The design parameters are the hole diameter (d), the hole position to specimen length ratio (P/L), the number of holes and distribution (n), and crosshead speed (V). Taguchi technique has been adapted to get the optimum crashworthiness parameters. Experiments based on Taguchi’s orthogonal array with 9 experimental runs (L9) were performed. Optimal conditions with the maximum absorbed energy (U) and minimum initial peak force ([Formula: see text]) were determined. The main effects, signal to noise ratio (S/N), and analysis of variance (ANOVA) have been investigated. Results indicated that “V” followed by “d” are the highest influencing parameters on the values of “U” with a contribution of 49% and 43%, respectively. The dominant influencing parameter on the values of [Formula: see text] is “n” with a contribution of 94%. Finally, confirmation tests were carried out to validate the estimated model with respect to experimental results. The optimum U and [Formula: see text] of GFRP square pipes with circular cutouts were compared with those of non-porous specimens.

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Lightweight cost-effective hybrid materials for energy absorption applications

“…2. Due to its ease and low requirements, this manufacturing method was employed by different investigators in many scholarships 4,5,[27][28][29][30] . The manufacturing process steps can be summarized as follows:…”

Energy absorption characteristics of E-glass/epoxy over-wrapped aluminum pipes with induced holes: an experimental research

“…Also, if PCs are appropriately designed, they could gradually crash and delaminate to dissipate the impact energy [14][15][16][17] . PCs are characterized by their excellent specific stiffness and strength, outstanding energy absorbing capacity, non-conductivity, good corrosion resistance, and high thermal insulation [18][19][20][21] .The advantages of increased specific strength and stiffness of FRP as well as the toughness of the metals can be combined to create hybrid structures out of metals and fiber reinforced polymers (FRP) 22 . Therefore, it is possible to create very desirable energy-absorbing structures by using the right amount of metallic components in combination with FRP composites 23 .…”

“…Also, if PCs are appropriately designed, they could gradually crash and delaminate to dissipate the impact energy [14][15][16][17] . PCs are characterized by their excellent specific stiffness and strength, outstanding energy absorbing capacity, non-conductivity, good corrosion resistance, and high thermal insulation [18][19][20][21] .…”