Experimental investigations of the shrinking–splitting tube collision energy absorber

Tanasković, Jovan; Milković, Dragan; Lučanin, Vojkan; Franklin, G. Vasic

doi:10.1016/j.tws.2014.10.007

Cited by 37 publications

(10 citation statements)

References 10 publications

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“…The geometry of the splitting tool was chosen by using results of quasi-static investigations described Ref. [14]. The tool consists of a smooth cylindrical body and a flat base, with a large fillet radius that splits the tube along the grooves and causes the split ends of the tube to curl away.…”

Section: Samplesmentioning

confidence: 99%

Numerical Validation of the Combined Extrusion-Splitting Process of Energy Absorption Through Experimental Study

et al. 2017

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This paper describes validation process of numerical model of combined collision kinetic energy absorber of rail vehicles based on results of experimental investigations. Combined absorber works on the principle of extrusionsplitting the seamless tube. With the aim to choose the most appropriate tube geometry, the tubes of the different geometry of cross section were made and tested. Key geometry parts have the shape and length of the grooves along the inner tube wall. During the second phase of deformation comes to controlled splitting of the tube wall along these grooves. Experimental and numerical investigations were realized on the scaled samples. Using this type of absorber energy absorption occurs by friction between absorption elements and elastic-plastic deformation of the tube.Combining of two deformation processes gives a higher absorption power as well as compact dimensions of absorber which can be installed in a very limited space in the front part of the vehicle structure. Creating of the numerical model and numerical simulations of extrusion-splitting processes were realized using SolidWorks and ANSYS LS Dyna software packages. Results of experimental investigations and numerical simulations show very good agreement which verifies developed numerical model for use in further investigations in this field.

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Section: Samplesmentioning

confidence: 99%

Numerical Validation of the Combined Extrusion-Splitting Process of Energy Absorption Through Experimental Study

et al. 2017

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“…16 in the context of tube forming. They have also been researched as railway energy absorbers individually by Li et al., 17 and by Tanaskovic et al., 18,19 in combination with the splitting of the tubes. Liu and Qiu 20 proposed a theoretical model of the shrinking metal tube, as a generalization of a proposed model for radial expansion tubes.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical assessment of oblique loading quasi-static testing of railway anticlimbers

Moreno

Reid

Williams

2020

Proceedings of the Institution of Mechanical Engineers, Part F:

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An oblique loading angle test was devised in order to subject the anticlimbers of railway vehicles to a predetermined perpendicular load as well as a predetermined bending moment. The motivation for this type of test was the Standard and industry requirements for anticlimbing devices to prevent overriding and resist a determined perpendicular force while dissipating energy. Anticlimbing units, based on shrinking circular deformation tubes, were subjected to compression tests. The oblique loading was applied by placing the anticlimbing unit on a plate at an angle to the centreline of the unit. A numerical model was validated against the test results, in order to infer the bending moment subjected to the anticlimber unit. The bending moment on the anticlimbers was expected to be fully determined by the perpendicular force and the length of the tube. The predicted bending moment measured by the validated numerical model was smaller than anticipated and was potentially unpredictable. The discrepancy was caused by the irregular distribution of the normal force at the interface of the test machine and the anticlimber head. As a result, the devised angle test was proved unsuitable to induce a consistent and predictable bending moment on the anticlimber units of railway vehicles.

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“…Designing a specific energy absorber to absorb or dissipate the prescribed energy is of great importance. A shrinking-splitting tube was used as an energy absorber for railway vehicles by Tanaskovic et al [1]. Peng et al [2] proposed a composite structure with diaphragms, a guide rail, and honeycomb structures for subway vehicles, and a composite structure FE model was developed and validated by experimental data.…”

Section: Introductionmentioning

confidence: 99%

An investigation on the energy absorption characteristics of a multi-cell hexagonal tube under axial crushing loads

Yue

et al. 2020

PLoS ONE

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A multi-cell tube enhances the energy absorption considerably compared to the absorption of a single tube under the same conditions. A novel tube configuration, namely, a multi-cell hexagonal tube, was proposed in this paper. The multi-cell tubes consist of three basic elements: a 2-panel element and two 3-panel elements (I and II). Simplified super folding element theory was utilized to estimate the energy dissipation of the basic elements. Based on this estimation, a theoretical expression for the mean crushing force was developed for the proposed tubes. The relative errors between a simulation, an experiment and theoretical results were no more than 5%. The effects of the hexagonal tube size and wall thickness on the crashworthiness of the multi-cell tubes were investigated. To a certain extent, the energy absorption and peak crushing force increased as the tube size and thickness increased. The response surface method (RSM) and the multi-objective non-dominated sorting genetic algorithm (NSGA-II) were used to improve the crashworthiness of the tube, and Pareto fronts were achieved. Finally, it was concluded that the optimal solution is C = 45 mm, t1 = 3.0 mm, and t2 = 2.35 mm, and the corresponding SEA and PCF were 16.52 kJ/kg and 411.36 kN, respectively.

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Experimental investigations of the shrinking–splitting tube collision energy absorber

Cited by 37 publications

References 10 publications

Numerical Validation of the Combined Extrusion-Splitting Process of Energy Absorption Through Experimental Study

Numerical Validation of the Combined Extrusion-Splitting Process of Energy Absorption Through Experimental Study

Experimental and numerical assessment of oblique loading quasi-static testing of railway anticlimbers

An investigation on the energy absorption characteristics of a multi-cell hexagonal tube under axial crushing loads

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