OPTIMIZATION DESIGN OF ALU FOAM-FILLED S-SHAPE SQUARE TUBE UNDER AXIAL DYNAMIC LOADING

2020 ◽  
Vol 40 (04) ◽  
Author(s):  
NGUYEN VAN SY ◽  
NGUYEN THANH TAM
Keyword(s):  
Energy Absorption ◽  
Optimization Design ◽  
Optimal Designs ◽  
Design Parameters ◽  
Aluminum Foams ◽  
Response Surface Models ◽  
Element Simulation ◽  
Crushing Force ◽  
Surface Models ◽  
Foam Filled

This paper presents finite element simulation of the crash behavior and the energy absorption characteristics of S-shape square tubes which were fully or partially filled with aluminum foams. Base on the numerical results, it is found that, the density, the length of the filled foam and the thickness of tube directly affect the specific energy absorption (SEA) and peak crushing force (PCF) of the S-shape tubes. In this paper, the multi-objective particle swarm optimization (MOPSO) algorithm is employed to seek for optimal designs for the partial foam-filled S-shape tubes (PFSTs) and the full foam-filled S-shape tubes (FFSTs) with various design parameters such as the density, the length of filled foam and the thickness of tube, where response surface models are established to formulation SEA and PCF. The optimization results showed the energy absorption capability per unit mass of the PFSTs is more powerful than that of the FFSTs while the PCF constrained under the same level.

scholarly journals Optimization design for foam-filled double cylindrical tubes under multiple lateral impacts

2018 ◽  
Vol 10 (12) ◽  
pp. 168781401881123 ◽  
Author(s):  
Ping Jiang ◽  
Qidong Wang ◽  
Andong Yin ◽  
Jinfang Hu ◽  
Xianguang Gu
Keyword(s):  
Energy Absorption ◽  
Optimization Design ◽  
Numerical Study ◽  
Hybrid Structure ◽  
Design Parameters ◽  
Lateral Impact ◽  
Original Design ◽  
Bending Resistance ◽  
Cylindrical Tubes ◽  
Foam Filled

Nowadays, thin-walled foam-filled structures have already been excessively used in automobile industry due to the superior energy absorption capacity and relatively light weight. The components in vehicle probably subject to lateral impact at any position in practice; however, most of the previous literature focused only on the bending behavior of structures under lateral impact at the mid-span. In this study, a hybrid structure of the structural epoxy foam Terocore® and two cylindrical tubes is comprehensively investigated under various lateral impact positions. The finite element model of the hybrid structure is established and then validated by the experimental results. From a numerical study, several design parameters, including the thicknesses of outer and inner tubes, the diameters of inner tubes, and the foam densities, are explored to exhibit great effects on the bending resistance of the hybrid structure. To find the optimal designs of the hybrid structure under different load cases, a system methodology, which is constructed by optimal Latin hypercube sampling, radial basis function model and multi-objective particle swarm optimization algorithm, is implemented. Compared with the original design, the optimization designs of different load cases perform better bending resistance, namely, higher specific energy absorption and lower peak crushing force. Therefore, the optimal hybrid structure can be considered as a practical candidate for energy absorbing under lateral impact.

scholarly journals Energy Absorption of Different Cell Structures for Closed-Cell Foam-Filled Tubes Subject to Uniaxial Compression

Metals ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1579 ◽  
Author(s):  
Yang Yu ◽  
Zhuokun Cao ◽  
Ganfeng Tu ◽  
Yongliang Mu
Keyword(s):  
Energy Absorption ◽  
Absorption Efficiency ◽  
Foam Core ◽  
Aluminum Foams ◽  
Static Compression ◽  
Cell Structures ◽  
Closed Cell ◽  
Energy Absorption Efficiency ◽  
Foam Filled ◽  
Quasi Static Compression

The energy absorption of different cell structures for closed-cell aluminum foam-filled Al tubes are investigated through quasi-static compression testing. Aluminum foams are fabricated under different pressures, obtaining aluminum foams with different cell sizes. It is found that the deformation of the foam core is close to the overall deformation, and the deformation band is seriously expanded when the cell size is fined, which leads to the increase of interaction. Results confirm that the foam-filled tubes absorb more energy due to the increase of interaction between the foam core and tube wall when the foaming pressure increases. The energy absorption efficiency of foam-filled tubes can reach a maximum value of 90% when the foam core is fabricated under 0.30 MPa, which demonstrates that aluminum foams fabricated under increased pressure give a new way for the applications of foam-filled tubes in the automotive industry.

Multi-Objective Optimization Design of Functionally Graded Foam-Filled Graded-Thickness Tube Under Lateral Impact

2018 ◽  
Vol 16 (01) ◽  
pp. 1850088 ◽  
Author(s):  
Hanfeng Yin ◽  
Jinle Dai ◽  
Guilin Wen ◽  
Wanyi Tian ◽  
Qiankun Wu
Keyword(s):  
Energy Absorption ◽  
Wall Thickness ◽  
Functionally Graded ◽  
Design Parameters ◽  
Foam Density ◽  
Lateral Impact ◽  
Multi Objective Optimization ◽  
Foam Filled ◽  
Thin Walled ◽  
Graded Thickness

Foam-filled thin-walled structure has been widely used in vehicle engineering due to its highly efficient energy absorption capacity and lightweight. Unlike the existing foam-filled thin-walled structures, a new foam-filled structure, i.e., functionally graded foam-filled graded-thickness tube (FGFGT), which had graded foam density along the transverse direction and graded wall thickness along the longitudinal direction, was first studied in this paper. Two FGFGTs with different gradient distributions subjected to lateral impact were investigated using nonlinear finite element code through LS-DYNA. According to the parametric sensitivity analysis, we found that the two design parameters [Formula: see text] and [Formula: see text], which controlled the gradient distributions of the foam density and the tube wall thickness, significantly affected the crashworthiness of the two FGFGTs. In order to seek for the optimal design parameters, two FGFGTs were both optimized using a meta-model-based multi-objective optimization method which employed the Kriging modeling technique as well as the nondominated sorting genetic algorithm II. In the optimization process, we aimed to improve the specific energy absorption and to reduce the peak crushing force simultaneously. The optimization results showed that the FGFGT had even better crashworthiness than the traditional uniform foam-filled tube with the same weight. Moreover, the graded wall thickness and graded foam density can make the design of the FGFGT flexible. Due to these advantages, the FGFGT was an excellent energy absorber and had potential use as the side impact absorber in vehicle body.

Quasi-Static Crushing of Aluminum Foam-Filled Thin-Walled Aluminum Tubes

2018 ◽  
Vol 933 ◽  
pp. 209-214
Author(s):  
Yang Yu ◽  
Zhuo Kun Cao ◽  
Min Li ◽  
Hong Jie Luo
Keyword(s):  
Cell Size ◽  
Energy Absorption ◽  
Aluminum Foam ◽  
Cell Structure ◽  
Peak Load ◽  
Aluminum Foams ◽  
Static Compression ◽  
Aluminum Tubes ◽  
Foam Filling ◽  
Foam Filled

The effect of aluminum foams with different cell structure on the quasi-static compression behavior and energy absorption of aluminum tubular structures was investigated. For comparison, empty tubes and aluminum foams with different cell structure were also tested, respectively. The results indicated that the value of crushing peak load of aluminum foam-filled tubes increases from 57.88% (1.94mm cell size) to 89.33% (1.22mm cell size) respectively compared with 2.83mm cell size. Splitting deformation of foam filling was found to effect in increasing the extra contact between the foam filling and the tube during progressive crushing, which increases the lateral compressive forces on the tubes. The energy absorption of aluminum foams filled aluminum tubes was also improved significantly due to the change of cell structure.

scholarly journals E-optimal designs for second-order response surface models

2014 ◽  
Vol 42 (4) ◽  
pp. 1635-1656 ◽  
Author(s):  
Holger Dette ◽  
Yuri Grigoriev
Keyword(s):  
Response Surface ◽  
Second Order ◽  
Optimal Designs ◽  
Response Surface Models ◽  
Surface Models
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