Authors: W M Choi J S Kim H S Jung T S Kwon
Publish Date: 2011/05/15
Volume: 12, Issue: 3, Pages: 383-389
Abstract
As a crash energy absorber a tubetype crash element expansion tube dissipates kinetic energy through the internal deformation energy of the tube and through frictional energy In this paper the effects of the variation of punch angles on the energyabsorbing characteristics of expansion tubes were studied by quasistatic tests using three punch angles 15° 30° and 45° A finite element analysis of the tube expanding process m = τ max /K was performed using a shear friction model to confirm the variation of the shear friction factor with respect to punch angles using the inverse method Additional analyses were performed using angles of 20° 25° 35° and 40° to study the effect of the punch angles on the internal deformation energy frictional energy and expansion ratio of the tubes The results of the experiment and finite element analysis showed that the shear friction factor was inversely proportional to the punch angles and a specific punch angle existed at which the absorbed energy and expansion ratio remained constant
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