Experimental and numerical crashworthiness investigation of combined circular and square sections

Shojaeefard, Mohammad Hassan; Najibi, Amir; Anbarloei, Mahdi; Yeganeh, M. S.

doi:10.1007/s12206-013-1172-x

Cited by 18 publications

(9 citation statements)

References 27 publications

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“…The crush force efficiency and absorbed energy was reported to increase with increasing shallow spherical cap radius. Shojaeefard et al [22] studied the quasi-static crushing behavior of combined cylindrical and square section tubes and showed that the absorbed energy of the combined tubes was slightly higher than both square and circular tubes of the same length.…”

Section: Introductionmentioning

confidence: 99%

Crushing and energy absorption characteristics of combined geometry shells at quasi-static and dynamic strain rates: Experimental and numerical study

Taşdemirci

Sahin

Kara

et al. 2015

Thin-Walled Structures

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a b s t r a c tThe quasi-static and dynamic crushing response and the energy absorption characteristics of combined geometry shells composed of a hemispherical cap and a cylindrical segment were investigated both experimentally and numerically. The inelastic deformation of the shells initiated with the inversion of the hemisphere cap and followed by the axisymmetric or diamond folding of the cylindrical segment depending on the loading rate and dimensions. The fracture of the thinner specimens in dynamic tests was ascribed to the rise of the flow stress to the fracture stress with increasing strain rate. The hemisphere cap absorbed more energy at dynamic rates than at quasi-static rates, while it exhibited lower strain rate and inertia sensitivities than the cylinder segment. For both the hemisphere cap and the cylinder segment, the inertial effect was shown to be more pronounced than strain rate effect at increasing impact velocities.

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Section: Introductionmentioning

confidence: 99%

Crushing and energy absorption characteristics of combined geometry shells at quasi-static and dynamic strain rates: Experimental and numerical study

Taşdemirci

Sahin

Kara

et al. 2015

Thin-Walled Structures

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“…Results showed that the specific energy absorption capability of the combined tube is significantly higher than that of the square tube and is close to that of the circular tube. Moreover, the initial peak load of combined tube is significantly lower than that of the circular tube and somewhat lower than that of the square tube (Shojaeefard et al, 2014). Baroutaji et alhas studied the energy absorption behavior and crashworthiness optimization of short length circular tubes under quasi-static lateral loading.…”

Section: Latin American Journal Of Solids and Structures 13 (2016) 25mentioning

confidence: 99%

Developing and Multi-Objective Optimization of a Combined Energy Absorber Structure Using Polynomial Neural Networks and Evolutionary Algorithms

Najibi

Shojaeefard

Yeganeh

2016

Lat. Am. j. solids struct.

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In this study a newly developed thin-walled structure with the combination of circular and square sections is investigated in term of crashworthiness. The results of the experimental tests are utilized to validate the Abaqus/Explicit TM finite element simulations and analysis of the crush phenomenon. Three polynomial metamodels based on the evolved group method of data handling (GMDH) neural networks are employed to simply represent the specific energy absorption (SEA), the initial peak crushing load (P1) and the secondary peak crushing load (P2) with respect to the geometrical variables. The training and testing data are extracted from the finite element analysis. The modified genetic algorithm NSGA-II, is used in multi-objective optimisation of the specific energy absorption, primary and secondary peak crushing load according to the geometrical variables. Finally, in each optimisation process, the optimal section energy absorptions are compared with the results of the finite element analysis. The nearest to ideal point and TOPSIS optimisation methods are applied to choose the optimal points.

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“…Ghamarian et al [10] showed that the crush force efficiency and absorbed energy of shallow spheres as end-cap in conical tubes increased with increasing spherical cap radius. Shojaeefard et al [11] showed that the absorbed energy of combined tubes were higher than those of individual components of the same length. Shahi and Marzbanrad [12] investigated the crushing behavior of segmented thin walled tubes.…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on the blast loading response of combined geometry shell core sandwich structures

Taşdemirci

Kara

Turan

et al. 2016

Thin-Walled Structures

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a b s t r a c tThe effect of heat treatment on the dynamic crushing and energy absorption behavior of combined geometry shell cores (hemisphere and cylinder) of sandwich structures were investigated both experimentally and numerically. The applied heat treatment on the combined geometry shell cores relieved the stress caused by deep drawing, diminishing the peak transmitted forces. The verified numerical models of the as-received and heat-treated combined geometry shells were used to model blast loading of various sandwich configurations and the additional sandwich configurations of reversing the cylindrical side of the cores to the impacted side. Both the applied heat-treatment and the reversing process decreased the magnitude of the force transmitted to the protected structure. The applied heat treatment increased the arrival time of blast force wave to the protected structure, while the reversing resulted in opposite.

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Experimental and numerical crashworthiness investigation of combined circular and square sections

Cited by 18 publications

References 27 publications

Crushing and energy absorption characteristics of combined geometry shells at quasi-static and dynamic strain rates: Experimental and numerical study

Crushing and energy absorption characteristics of combined geometry shells at quasi-static and dynamic strain rates: Experimental and numerical study

Developing and Multi-Objective Optimization of a Combined Energy Absorber Structure Using Polynomial Neural Networks and Evolutionary Algorithms

Effect of heat treatment on the blast loading response of combined geometry shell core sandwich structures

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