Theoretical prediction and crashworthiness optimization of multi-cell triangular tubes

In this paper, a Multi-objective particle swarm optimization algorithm (MOPSOA) is applied to optimize surface roughness of workpiece after circular magnetic abrasive polishing. The most important parameters of polishing model, namely current, gap between pole and workpiece, spindle speed and polishing time, were considered in this approach. The objective functions of the MOPSOA depend on the quality of surface roughness of polishing materials with both simultaneous surfaces (R a1 , R a2 ), which are determined by means of experimental approach with the aid of circular magnetic field. Finally, the effectiveness of the approach is compared between the optimal results with the experimental data. The results show that the new proposed polishing optimization method is more feasible.

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“…An approximationˆ( ) y x to the structural responses is assumed a priori in terms of the polynomial function [22,23].…”

Section: Meta Model Establishmentmentioning

confidence: 99%

Multi-objective optimization of circular magnetic abrasive polishing of SUS304 and Cu materials

et al. 2016

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“…Some studies focused on thin-walled columns with innovative cross-sections [5][6][7][8][9][10][11][12][13][14][15]. By contrast, some studies focused on columns made of high strength materials [16][17][18][19], or filled by different materials [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Qiu et al [9] used FE method to predict the response of hexagonal multi-cell columns to off-axis quasistatic loads. Tran et al [10] proposed the triangular multi-cell and employed the SFE method to optimize the geometric parameters. A similar approach was adopted to optimize the geometric parameters of angle element multi-cell structures [11].…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study on crashworthiness of cold-formed dimpled steel columns

Wang¹,

Nguyen²,

English³

et al. 2017

Thin-Walled Structures

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The UltraSTEEL ® forming process forms plain steel sheets into dimpled steel sheets and this process increases the sheet material's strengths by generating plastic deformation on the material during the process. This paper presented experimental testing and developed a finite element (FE) model to predict the energy absorption characteristics of dimpled thin-walled structures under axial impact loads, and compared the energy absorption efficiencies (specific energy absorption) of plain and dimpled columns. Dynamic experimental tests were conducted using the drop tower at two different impact velocities. Explicit FE analysis were then carried out to simulate the experiments. The FE method was validated by comparing the numerical and experimental failure modes, crushing force response and specific energy absorptions. The validated FE method was then applied in an optimization study on the parameter of forming depth. The effects of forming depth on both geometry and material properties have been taken into account in the optimization study. It has been found that the specific energy absorption of dimpled columns is up to 16.3% higher than the comparable plain columns.

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“…(Liu et al, 2015)introduced a way for improving energy absorption property by adding bulkheads in the columns, also presented that the bulkheads can change the deformation mode from an expansion-contraction mode to a progressive mode. Moreover, the influence of ring-stiffened circular tubes have been studied (Ross et al, 1994;Salehghaffari et al, 2011) and the internal stiffeners (called multi-cell sections) have been applied in engineering application (Nia and Parsapour, 2014;Tran et al, 2014;andZhang and Zhang, 2014). …”

Section: Introductionmentioning

confidence: 99%

A New Configuration of Circular Stepped Tubes Reinforced with External Stiffeners to Improve Energy Absorption Characteristics Under Axial Impact

Zahran

Xue

Esa

et al. 2017

Lat. Am. j. solids struct.

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State-of-the art studies of impact crushing circular stepped tube (inversion tube) introduce various approaches to improve the energy absorption capacities. Adding external longitudinal stiffeners on the circular stepped tubes is a new approach that have a great effect and interest. In the current study, finite element analysis using (LS-DYNA/WORKBENCH ANSYS) is performed on a series of numerical models of aluminum circular stepped tubes that are externally stiffened by a constant number of longitudinal stiffeners distributed around the cross section of the circular stepped tube. The numerical models are implemented under an axial impact crushing scenario. Furthermore, a new improved formula for prediction of steady inversion load is proposed. The theoretical predictions are found to be in good agreement with the numerical results with an error within 12%. A comparative study is conducted to compare the energy absorption characteristics and inversion mechanism between the newly proposed tubes and the conventional stepped tube. The results showed that addition of external longitudinal stiffeners on circular stepped tubes could imply greatest improvement for the energy absorption up to 104%, specific energy absorption capability (energy absorption per unit mass) up to 54.9%, the crush force efficiency up to 40.3% and increase the inversion stroke length in comparison with the unstiffened circular stepped tubes. A newfound role of external longitudinal stiffeners added to the stepped tubes that controls the inversion and deformation mechanism is presented.

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Theoretical prediction and crashworthiness optimization of multi-cell triangular tubes

Cited by 129 publications

References 33 publications

Multi-objective optimization of circular magnetic abrasive polishing of SUS304 and Cu materials

Multi-objective optimization of circular magnetic abrasive polishing of SUS304 and Cu materials

Experimental and numerical study on crashworthiness of cold-formed dimpled steel columns

A New Configuration of Circular Stepped Tubes Reinforced with External Stiffeners to Improve Energy Absorption Characteristics Under Axial Impact

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