Open AccessAnalysis of the collapse mode classification in case of circular tubes
Author(s) -
C. P. Predoiu,
Raluca Negrea,
Ștefan Tabacu,
Dinel Popa
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/997/1/012028
Subject(s) - acceleration , structural engineering , buckling , displacement (psychology) , automotive industry , mode (computer interface) , deformation (meteorology) , work (physics) , collision , engineering , mechanical engineering , computer science , automotive engineering , aerospace engineering , physics , psychology , computer security , classical mechanics , meteorology , psychotherapist , operating system
In this paper, the authors present an analysis of the collapse mode of tubes with circular cross-section under axial loads. Considering that requirements related to pollution are becoming more stringent, modern transportation systems require lightweight materials. These materials should have a high degree of protection. To reduce the CO 2 emissions value, a vehicle is powered by an engine with a small displacement. Furthermore, to achieve good performances in terms of acceleration and maximum speed, the total mass of the vehicle should be decreased. In case of a collision, this energy is consumed, mainly, by controlled deformation of the sacrificial structures. During an impact, the dimensions of the cockpit must not change. The same time is necessary to obtain a minimal acceleration to ensure the health of the passengers. This requirement is not compatible with a rigid structure and leads to a high acceleration level. Sacrificial structures are defined by tubes with closed profiles. Studies related to thin-walled structures with the circular cross-section under axial loads have a strong background in the work of Guillow and Andrews. The paper proposes to add complemental information these charts for another type of material, and the result obtained are correlated with the limits from the other studies existing. The research is focused on the structures with the height correlated to the structures used in the automotive industry. The analysis of global buckling for the tall structures is completed by a theoretical evaluation using Euler’s equation.