Numerical crushing analysis of aluminum foam-filled corrugated single- and double-circular tubes subjected to axial impact loading

Kılıçaslan, Cenk

doi:10.1016/j.tws.2015.08.009

Cited by 92 publications

(14 citation statements)

References 42 publications

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“…The static and dynamic friction coefficients were set sequentially to 0.3 and 0.2 in all contact definitions. These values of friction coefficients were also previously applied and shown to yield the numerical results well agreed with the experiments . The numerical stresses on the incident bar were calculated at the same locations with the strain gages in the experimental set‐up.…”

Section: Numerical Modelsmentioning

confidence: 68%

Impact loading and modelling a multilayer aluminium corrugated/fin core: The effect of the insertion of imperfect fin layers

Sarıkaya

Taşdemirci

Güden

2019

Strain

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The quasi‐static compression (0.0048 m/s) and Taylor‐like impact (135, 150, and 200 m/s) loading of a multilayer 1050 H14 aluminium corrugated core were investigated both experimentally and numerically in LS‐DYNA using the perfect and imperfect sample models. In the imperfect sample models, one or two layers of corrugated fin structure were replaced by the fin layers made of bent‐type cell walls. The localised deformation in the quasi‐static imperfect models of cylindrical sample started at the imperfect layers, the same as the tests, and the layers were compressed until about the densification strain in a step‐wise fashion. The localised deformation in the perfect models, however, started at the layers at and near the top and bottom of the test sample. In the shock mode, the sample crushed sequentially starting at the impact end layer regardless the perfect or imperfect sample models were used. Furthermore, the perfect and imperfect models resulted in nearly the same initial crushing stresses in the shock mode. The layer strain histories revealed a velocity‐dependent layer densification strain. Both model types, the imperfect and perfect, well approximated the stress‐time histories and layer deformations of the shock mode. The rigid perfectly plastic locking model based on the numerically determined densification strains also showed well agreements with the experimental and numerical plateau stresses of the shock mode.

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Section: Numerical Modelsmentioning

confidence: 68%

Impact loading and modelling a multilayer aluminium corrugated/fin core: The effect of the insertion of imperfect fin layers

Sarıkaya

Taşdemirci

Güden

2019

Strain

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“…[24][25][26][27][28][29][30][31] The corrugations introduced in the tubes have just caused more interest among researchers in this area as they are proven to ease the plastic deformation and make them happen at predetermined intervals along the tube. [32][33][34][35] The main purpose of using them is to optimize the uniformity of the force-displacement curves of the tubes which are crushed axially, in addition to predicting and controlling the collapse mode in each corrugation and to improve the EA capacity of the whole structure. Eyvazian et al 36 experimentally studied the effect of corrugations on crashworthiness of aluminum tubes, realizing that creating corrugated tubes can result in a favorable increase in EA.…”

Section: Introductionmentioning

confidence: 99%

Bi-tubular corrugated composite conical–cylindrical tube for energy absorption in axial and oblique loading: Analysis and optimization

Sadighi

Mahbod

Asgari

2020

Journal of Composite Materials

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In this paper, a new bi-tubular corrugated composite tube, consisting of inner and outer cylindrical and conical tubes is proposed. Different models with various geometrical parameters including the radius of curvatures and their numbers are considered and studied numerically in axial and oblique crushing in order to achieve favorable crashworthiness parameters. Moreover, quasi-static compression tests have been conducted to obtain results in order to validate the finite element model. There has been a sensible agreement between the numerical results and experimental data. Finite element models are also validated using the analytical solutions for both straight and corrugated composite tubes. Regardless of the number and radius of curvatures, as the crashworthiness of bi-tubular corrugated structures both in axial and oblique crushing is investigated and compared with their single-wall and bi-tubular straight peers, a considerable improvement is achieved in all crashworthiness parameters, including desirable increase in specific energy absorption, favorable reduction in peak force, and consequently a beneficial rise in crushing force efficiency. In addition, an optimization study using a suitable multi-objective function is done to choose the best model among the existing models, in addition to finding an optimum model via genetic algorithm. In the next step, a parametric study is conducted on the best model to inspect how well it undergoes oblique crushing at different angles. Finally, this best model and two other candidates have been chosen to investigate the effect of using foams and then the energy absorption capability of the empty and foam-filled tubes has been compared.

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“…The material, size, and cross-sectional shape of the structure are the important factors affecting the crashworthiness of the structures. 4 The effects of filling materials on the crashworthiness of various foam-filled tubes with different cross-sections are studied, such as circular tubes, 5,6 square tubes, 7–10 single and bi-tubular polygonal tubes, 11 conical tubes, 12–14 multi-cell tubes, 15 corrugated tubes, 16,17 ellipse tubes, 18,19 double-hat tubes, 20 star polygon tubes, 21 and so on. In addition, to reduce the weight while maintaining the mechanical property of the original tube, patterned windows 22–24 and circular discontinuities 25,26 are introduced to the thin-walled structures.…”

Section: Introductionmentioning

confidence: 99%

An effective topology optimization method for crashworthiness of thin-walled structures using the equivalent linear static loads

Ren

Min

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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The equivalent static loads method for nonlinear dynamic response structural optimization may be failed in large deformation crash conditions, due to topology optimization with the equivalent static loads mostly beyond the linear range and causing numerical defects such as high compliance of elements. To overcome the above disadvantage, an advanced structural topology optimization method for crashworthiness considering crash-reduced large deformation and plastic buckling is proposed using newly defined equivalent linear static loads. The equivalent linear static loads can adaptively scale to guarantee that the topology optimization is performed within linear range. At each cycle, the crash simulation is performed and the nonlinear nodal displacement vector at the time step with the maximum strain energy is scaled by an adaptive displacement-scaling factor. The equivalent linear static loads that are generated by multiplying the linear stiffness matrix and the scaled nodal displacement vector will be incorporated into topology optimization, which can guarantee the topology optimization to remain in linear range and further solve the numerical instability problems. The process is repeated until the convergence criteria are satisfied. The effectiveness of the proposed method is evaluated by solving a crashworthiness topology optimization of a crash box considering crash-induced plastic buckling to determine the location and profile of crash triggers. The results show that the proposed method can effectively solve the large deformation crashworthiness topology optimization of thin-walled structures and provides a feasible strategy for crash triggers design in crash box.

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Numerical crushing analysis of aluminum foam-filled corrugated single- and double-circular tubes subjected to axial impact loading

Cited by 92 publications

References 42 publications

Impact loading and modelling a multilayer aluminium corrugated/fin core: The effect of the insertion of imperfect fin layers

Impact loading and modelling a multilayer aluminium corrugated/fin core: The effect of the insertion of imperfect fin layers

Bi-tubular corrugated composite conical–cylindrical tube for energy absorption in axial and oblique loading: Analysis and optimization

An effective topology optimization method for crashworthiness of thin-walled structures using the equivalent linear static loads

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