On design of multi-cell tubes under axial and oblique impact loads

Fang, Jianguang; Gao, Yunkai; Sun, Guangyong; Qiu, Na; Li, Qing

doi:10.1016/j.tws.2015.07.002

Cited by 234 publications

(61 citation statements)

References 52 publications

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“…However, at large angles, all structures show a bending-dominated deformation pattern, which leads to a decrease in the energy absorption and peak force. S. Pirmohammad et al [15][16] found the same law when analyzing the oblique impact performance of other cross-sectional shapes of thin-walled tubes. The results of A. Othman et al [17] showed the performance of the composite square tube filled with polymer foam is better than empty composite tubes under oblique loads through experimental results.…”

Section: Introductionmentioning

confidence: 68%

Study on Impact Performance of Energy Absorbing Structures under Horizontal Offset Loading

Yao¹,

Xiao²,

Xu³

et al. 2017

dtetr

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Abstract. When a train collision occurs, it is impossible for the vehicle to produce a completely axial collision. To improve the energy absorption performance of the energy-absorbing structure under an eccentric collision, in this paper, the collision performance of a subway vehicle energy absorption structure under a horizontal offset of 0-40 mm is studied via simulation. The results show that the original structure is prone to instability when the horizontal offset is large, so it is necessary to perform an optimization. Based on the concept of gradient material, the honeycomb strength in the structure is changed into a gradient distribution, and the results show that the improved structure did not show any instability phenomenon under all horizontal offsets. Under the horizontal offset of 40 mm, compared with the original structure, the energy absorption increased by 171.88% and the peak force decreased by 1.92% at the same time.

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Section: Introductionmentioning

confidence: 68%

Study on Impact Performance of Energy Absorbing Structures under Horizontal Offset Loading

Yao¹,

Xiao²,

Xu³

et al. 2017

dtetr

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“…Welding processes are evaluated using MCDM with fuzzy logic [29], while laser cutting technological parameters are defined using AHP-TOPSIS [30]. There are many methods for thin-walled structure evaluation using Complex Proportional Assessment (COPRAS) [31][32][33][34][35][36][37], which confirms the implementation of these methods in the field of engineering.…”

Section: Introductionmentioning

confidence: 77%

Analysis of Steel Wire Rope Diagnostic Data Applying Multi-Criteria Methods

et al. 2018

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Steel ropes are complex flexible structures used in many technical applications, such as elevators, cable cars, and funicular cabs. Due to the specific design and critical safety requirements, diagnostics of ropes remains an important issue. Broken wire number in the steel ropes is limited by safety standards when they are used in the human lifting and carrying installations. There are some practical issues on loose wires-firstly, it shows end of lifetime of the entire rope, independently of wear, lubrication or wrong winding on the drums or through pulleys; and, secondly, it can stick in the tight pulley-support gaps and cause deterioration of rope structure up to birdcage formations. Normal rope operation should not generate broken wires, so increasing of their number shows a need for rope installation maintenance. This paper presents a methodology of steel rope diagnostics and the results of analysis using multi-criteria analysis methods. The experimental part of the research was performed using an original test bench to detect broken wires on the rope surface by its vibrations. Diagnostics was performed in the range of frequencies from 60 to 560 Hz with a pitch of 50 Hz. The obtained amplitudes of the broken rope wire vibrations, different from the entire rope surface vibration parameters, was the significant outcome. Later analysis of the obtained experimental results revealed the most significant values of the diagnostic parameters. The evaluation of the power of the diagnostics was implemented by using multi-criteria decision-making (MCDM) methods. Various decision-making methods are necessary due to unknown efficiencies with respect to the physical phenomena of the evaluated processes. The significance of the methods was evaluated using objective methods from the structure of the presented data. Some of these methods were proposed by authors of this paper. Implementation of MCDM in diagnostic data analysis and definition of the diagnostic parameters significance offers meaningful results.

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“…The multi-cell configurations was applied to the various cross-sectional shapes including hexagonal [46], triangular [41], square [42], [90]- [94], circular [56], [95], [96] octagonal [85], and tapered [97] tubes. The studies on the multi-cell tubes have revealed that these structures are very weight-effective components with extraordinary energy absorption capability.…”

Section: Multi-cell Tubesmentioning

confidence: 99%

“…The responses of other geometrical shapes of obliquely loaded TW energy absorbers were also reported in the literature. The studied cross-sections included multi-cell hexagonal columns [46], frusta [118], [119], empty and foam-filled square tubes [120], multi-cell square tube [42], [90], tapered square tubes [69], [121]. The main observation that was reported by the researchers is that the TW components under oblique loading are more likely to undergo the global bending deformation mode which may extremely reduce its energy absorption effectiveness.…”

Section: Oblique Loadingmentioning

confidence: 99%

On the crashworthiness performance of thin-walled energy absorbers: Recent advances and future developments

Baroutaji

Sajjia

Olabi

2017

Thin-Walled Structures

496

135

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Over the past several decades, a noticeable amount of research efforts has been directed to minimising injuries and death to people inside a structure that is subjected to an impact loading.\ud \ud Thin-walled (TW) tubular components have been widely employed in energy absorbing structures to alleviate the detrimental effects of an impact loading during a collision event and thus enhance the crashworthiness performance of a structure.\ud \ud Comprehensive knowledge of the material properties and the structural behaviour of various TW components under various loading conditions is essential for designing an effective energy absorbing system.\ud \ud In this paper, based on a broad survey of the literature, a comprehensive overview of the recent developments in the area of crashworthiness performance of TW tubes is given with a special focus on the topics that emerged in the last ten years such as crashworthiness optimisation design and energy absorbing responses of unconventional TW components including multi-cells tubes, functionally graded thickness tubes and functionally graded foam filled tubes.\ud \ud Due to the huge number of studies that analysed and assessed the energy absorption behaviour of various TW components, this paper presents only a review of the crashworthiness behaviour of the components that can be used in vehicles structures including hollow and foam-filled TW tubes under lateral, axial, oblique and bending loading

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On design of multi-cell tubes under axial and oblique impact loads

Cited by 234 publications

References 52 publications

Study on Impact Performance of Energy Absorbing Structures under Horizontal Offset Loading

Study on Impact Performance of Energy Absorbing Structures under Horizontal Offset Loading

Analysis of Steel Wire Rope Diagnostic Data Applying Multi-Criteria Methods

On the crashworthiness performance of thin-walled energy absorbers: Recent advances and future developments

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