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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2007

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Axial crushing of monotubal and bitubal circular foam-filled sections

Tobota A., Karliński J., Kopczyński A.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 22, nr 2

71-74

Purpose: The main goal of this paper is to present experimental and numerical studies of dynamic axial crushing of thin-walled monotubal and bitubal foam-filled cylindrical sections. Design/methodology/approach: Dynamic tests were performed on empty as well on foam filled specimens. The effect of filling the specimens with different density polyurethane foams was studied as well. The explicit dynamic non-linear finite element code PAM-CRASH(TM) was used to simulate the crushing of columns. Findings: The influence of fillers on energy absorption and behavior of circular thin-walled monotubal and bitubal arrangements was examined. Three main collapse modes were identified for the crushed samples, i.e. compound diamond (assymmetric), concertina (axisymmetric) and mixed mode fold formations. Research limitations/implications: Further investigations concerning energy absorption of axially crushed monotubal and bitubal sections should be done. The influence of cross-section, foam density, impact velocity and other parameters should be examined more in details. Practical implications: The polyurethane foams turned out to be a significant factor positively influencing the energy absorption capability and so by application in the longitudinal memebers of cars frame improving passengers' safety. Originality/value: Further investigations concerning compressing of foam-filled monotubal and bitubal sections were presented. The results achieved from conducted tests proved the dependence of energy dissipation on application of filling materials and composite structures.