Multiobjective crashworthiness optimization of multi-cornered thin-walled sheet metal members

Abbasi, Milad; Reddy, Sekhar; Ghafarinazari, A.; Fard, Mohammad

doi:10.1016/j.tws.2014.12.009

Cited by 84 publications

(28 citation statements)

References 27 publications

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“…* is the homologous temperature and is given by * , where and represent the room temperature and the melting temperature, respectively. This JC material model has been successfully implemented to model impact on steel (Abbasi et al, 2015) and aluminium targets (Forrestal et al, 2010). The JC parameters used in this study are shown in (Abbasi et al, 2015;Forrestal et al, 2010).…”

Section: Latin American Journal Of Solids and Structures 13 (2016) 16mentioning

confidence: 99%

Ballistic Limit of High-Strength Steel and Al7075-T6 Multi-Layered Plates Under 7.62-mm Armour Piercing Projectile Impact

Rahman

Abdullah

Zamri

et al. 2016

Lat. Am. j. solids struct.

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This paper presents the computational-based ballistic limit of laminated metal panels comprised of high strength steel and aluminium alloy Al7075-T6 plate at different thickness combinations to necessitate the weight reduction of existing armour steel plate. The numerical models of monolithic configuration, double-layered configuration and triple-layered configuration were developed using a commercial explicit finite element code and were impacted by 7.62 mm armour piercing projectile at velocity range of 900 to 950 m/s. The ballistic performance of each configuration plate in terms of ballistic limit velocity, penetration process and permanent deformation was quantified and considered. It was found that the monolithic panel of high-strength steel has the best ballistic performance among all panels, yet it has not caused any weight reduction in existing armour plate. As the weight reduction was increased from 20-30%, the double-layered configuration panels became less resistance to ballistic impact where only at 20% and 23.2% of weight reduction panel could stop the 950m/s projectile. The triple-layered configuration panels with similar areal density performed much better where all panels subjected to 20-30% weight reductions successfully stopped the 950 m/s projectile. Thus, triple-layered configurations are interesting option in designing a protective structure without sacrificing the performance in achieving weight reduction. Keywords Ballistic impact; ballistic limit; double-layered plate; numerical simulation; triple-layered plate N.A. Rahman et al. / Ballistic Limit of High-Strength Steel and Al7075-T6 Multi-Layered Plates Under 7.62-mm Armour Piercing…

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Section: Latin American Journal Of Solids and Structures 13 (2016) 16mentioning

confidence: 99%

Ballistic Limit of High-Strength Steel and Al7075-T6 Multi-Layered Plates Under 7.62-mm Armour Piercing Projectile Impact

Rahman

Abdullah

Zamri

et al. 2016

Lat. Am. j. solids struct.

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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%

“…Tang et al [5] proposed a new strategy to increase the energy absorption capacity of thinwalled columns by introducing non-convex corners in cross sections. Abbasi et al [6,7] extended this strategy by carrying out numerical and experimental studies on hexagonal, octagonal and 12-edge section columns' response to both quasi-static and dynamic axial crushing loads. The numerical results were validated by comparing to experimental results in terms of failure mode as well as specific energy absorption (SEA).…”

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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“…Rao et al (2012) conducted a series of experiments to study the crashworthiness behaviour of aluminium alloy and high-tensile steel under low impact velocity and found that laminated high-tensile steel and aluminium alloy can increase the energy absorption of a structure [11]. Abassi et al (2015) also found that laminated high-strength steel and aluminium alloy can improve energy absorption capability of a box structure under low velocity impact [12].…”

Section: Introductionmentioning

confidence: 99%

Energy absorption capability and deformation of laminated panels for armoured vehicle materials

Rahman

Abdullah²,

Abdullah

et al. 2016

Int. J. Automot. Mech. Eng.

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This paper investigates the computational-based deformation and energy absorption capability of laminated metal panels composed of high-strength steel and aluminium alloy under low-velocity impact. Layering aluminium alloy plates with high-strength steel has become of interest for reducing the overall density of armoured vehicle bodies while improving the ballistic resistance. In order to enhance the attractiveness of laminated plate construction, it is essential to study the strength of the two different metals in a laminated panel under low-velocity impact before performing a ballistic impact. Two types of laminated panels were constructed: two-layer and three-layer configurations. Both were oriented transverse to the loading axis and solved using quasi-static analysis. The deformation behaviour of these panels was studied and the energy absorption capacities were quantified. The results showed that the energy absorption capacities of the laminated panels were on average 220% higher in the three-layer configuration panels compared to in the two-layer configuration panels. The deformation lengths in the three-layer configuration panels were on average 22% smaller than those of the two-layer configuration panels with 25% to 30% weight reduction. The best three-layer configuration panel will be used later for investigating a suitable combination panel for armoured vehicles subjected to ballistic impact.

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Multiobjective crashworthiness optimization of multi-cornered thin-walled sheet metal members

Cited by 84 publications

References 27 publications

Ballistic Limit of High-Strength Steel and Al7075-T6 Multi-Layered Plates Under 7.62-mm Armour Piercing Projectile Impact

Ballistic Limit of High-Strength Steel and Al7075-T6 Multi-Layered Plates Under 7.62-mm Armour Piercing Projectile Impact

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

Energy absorption capability and deformation of laminated panels for armoured vehicle materials

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