The large-scale crumpling of thin cylindrical columns

TL;DR: In this paper, the authors proposed a method to solve the problem of low energy consumption in materials science and engineering in the Izmir Institute of Technology, Materials Science and Engineering, Izmir.

TL;DR: In this article, the effect of varying parameters of radial and longitudinal geometrical pattern frequency on internal energy absorption and energy absorption effectiveness factor is also studied in axial impacts, and the results indicate that the circular sinusoidal patterned tubes behave better in energy absorption than square beams.

TL;DR: In this article, a kind of thin-walled cylinder crushing component used in the composite spiral anti-impact device was developed, and different structural models were proposed and simulated, and the results show that the arrangement of the hollow structure can restrain the ring mode deformation and Euler instability of the tube member in the crushing yield and can carry out the buckling deformation according to the expected crushing force during the compression deformation process and effectively reduce the initial peak force.

Abstract: Thin-walled metallic components have been widely used as energy absorbers. One key drawback is the high initial crippling load, which typically results in passenger injuries. It is the objective of this study to introduce taper angle to thin-walled prisms, and to examine the crushing response of thin-walled frusta. Nonlinear finite element models of thin-walled frusta of different cross-sectional geometries were developed. Experimental investigations were conducted to validate these models. The effects of key design parameters on the energy absorption characteristics of frusta were explored. Comparison between thin-walled prisms and frusta show that taper angle helps to reduce the initial crippling load and increase the resistance to global buckling. To take advantage of the interaction effects, a novel multi-frusta configuration was developed and it was shown that the energy absorption efficiency is significantly increased. The results of this work are valuable for enhancing the crashworthiness performance of thin-walled metallic energy absorber.

TL;DR: When a straight rod is subjected to end compression it is stable for small lateral displacements unless the compressing force exceeds a definite limit depending on the elastic constants of the material of the rod and its length and cross section dimensions as mentioned in this paper.