Experimental Study on Crashworthiness of Functionally Graded Thickness Thin-Walled Tubular Structures

Xu, Fengxiang; Tian, Xuefei; Li, G.

doi:10.1007/s11340-015-9994-3

Cited by 57 publications

(10 citation statements)

References 45 publications

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“…Based on the theoretical analysis in Section 3, two parameters are essential for predicting the mean load of the DSG tube theoretically: the global average thickness of the tube , which can be easily obtained based on the geometric configuration, and average thickness of the EEAR , which can be determined for a known half wavelength H using (25). However, calculating H using (16) and (19) requires a known value of , meaning the calculation process is circular.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…Baykasoglu and Cetin studied crashworthiness of circular tubes with gradient thicknesses [18]. The crushing resistances of circular tubes with axially graded thickness were then explored by Xu et al [19]. Graded thicknesses in the longitudinal direction were also extended to square [20] and multicell columns [21]; and corresponding performance optimization was presented.…”

Section: Introductionmentioning

confidence: 99%

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On the Folding Mechanics of Square Columns with Double‐Surfaced Gradients

Zhou

Chen

2019

Mathematical Problems in Engineering

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The implementation of graded thicknesses in structural designs is an efficient strategy for improving the energy absorption performance of thin-walled columns. In this study, the mechanical responses of square columns with double-surfaced gradients under axial crushing forces were analytically and numerically investigated. A mathematical expression for the mean crushing force on a novel tube design is derived according to the super folding element method by introducing two novel parameters: the average thickness of the efficient energy absorbing region (EEAR) and global average thickness. The analytical predictions show good agreement with the simulation results that were obtained using the nonlinear finite element program ANSYS/LS-DYNA. The results demonstrate that a greater coefficient of average thickness of the EEAR versus global average thickness improves the energy absorption efficiency. However, increasing this coefficient largely depends on the sectional material distribution law. To explore the effects of this law on crushing responses, three different material distribution types were investigated. A significant improvement in specific energy absorption (approximately 30%) was obtained for a double-surfaced column with an optimized material distribution type compared to that of a square column with a uniform thickness.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Folding Mechanics of Square Columns with Double‐Surfaced Gradients

Zhou

Chen

2019

Mathematical Problems in Engineering

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“…34 The crashing performance of circular tubes with linearly distributed thicknesses in the longitudinal direction was experimentally studied by Xu et al. 35 Ying et al. 36 introduced the graded strength defined by a power-law function with a gradient exponent.…”

Section: Introductionmentioning

confidence: 99%

“…In terms of advanced configurations with gradient properties, there are a large number of published literatures, which have shown that those structures could collapse in a more controlled manner and have a remarkable energy-absorbing efficiency. [31][32][33] For example, the effects of graded or variable thickness on energy absorption characteristics of aluminium circular tubes under axial crushing were numerically investigated by Baykasoglu et al 34 The crashing performance of circular tubes with linearly distributed thicknesses in the longitudinal direction was experimentally studied by Xu et al 35 Ying et al 36 introduced the graded strength defined by a power-law function with a gradient exponent. And an optimization design was further performed to achieve the matching between mechanical properties and safety performance of tubular structures.…”

Section: Introductionmentioning

confidence: 99%

Dynamic crashing behavior of thin-walled conical tubular structures with nonlinearly-graded diameters

Suo

2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Thin-walled structures with graded property have been paid more attention in recent years due to their significant balance between lightweight and crashworthiness. However, few studies have been focused on energy absorption capacity of thin-walled conical tubes with graded diameters. In this paper, the thin-walled conical aluminum tubes with nonlinearly-graded diameters are introduced and their corresponding crashing characteristics are performed. The diameters are assumed to nonlinearly vary according to a power-law distribution function primarily determined by a graded exponent n. It is found that the total weight of thin-walled conical tubes decreases with the increasing of the gradient exponent. The energy-absorbed performances such as specific energy absorption, initial peak crashing force, and mean crashing force of those graded tubular structures are numerically analyzed. And then the effects of various geometric parameters such as the gradient exponent, deformation distance, and diameter range on crashing behaviors are further evaluated. It is observed that those parameters especially the gradient exponent has significantly obvious effects on crashworthiness of the proposed nonlinearly graded tubes. It is also noted that the straight conical structure with gradient n = 1.0 may not show the best energy absorption characteristics compared with other gradients. The work could provide valuable information for effective design of thin-walled energy-absorbing structures with variable geometrical parameters.

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“…Zhang and Zhang 8 carried out experimental and numerical studies on the impact characteristics of tapered tubes with variable thickness under axial load. Xu et al 9 carried out experimental studies on the crashworthiness of thinwalled structures with FGT. Xu 10 found that FGT tubes had the advantage of reducing the initial peak force and improving EA compared to circular and conical tubes of uniform thickness.…”

Section: Introductionmentioning

confidence: 99%

Crashworthiness analysis and multiobjective optimization for circular tubes with functionally graded thickness under multiple loading angles

Yao

Xing

Zhao

2017

Advances in Mechanical Engineering

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In this article, the nonlinear finite-element analysis software LS-DYNA is used to study the crashworthiness of functionally graded thickness circular tubes under multiple loading angles (0°, 10°, 20°, 30°, and 40°). The specific energy absorption (SEA) and maximum crashing force (F max ) are used as evaluation indices with which to analyze the effect of the length-to-diameter ratio and thickness gradient index P on the crashworthiness characteristics of functionally graded thickness circular tubes. Taking the length-to-diameter ratio and thickness gradient as design variables, the full factorial experiment was designed. A surrogate model of the integrated specific energy absorption (SEA a ) and maximum crashing force (F 08 max ) when the impact angle is 0°was constructed using the response surface method; the nondominated sorting genetic algorithm II was used to optimize the surrogate model, and the Pareto-front solution set was obtained. The results show that the thickness gradient index and the length-to-diameter ratio have a greater influence on the crashworthiness characteristics of functionally graded thickness circular tubes under oblique impact load, and the appropriate geometric parameters can improve the crashworthiness characteristics of functionally graded thickness circular tubes.

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Experimental Study on Crashworthiness of Functionally Graded Thickness Thin-Walled Tubular Structures

Cited by 57 publications

References 45 publications

On the Folding Mechanics of Square Columns with Double‐Surfaced Gradients

On the Folding Mechanics of Square Columns with Double‐Surfaced Gradients

Dynamic crashing behavior of thin-walled conical tubular structures with nonlinearly-graded diameters

Crashworthiness analysis and multiobjective optimization for circular tubes with functionally graded thickness under multiple loading angles

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