Static and dynamic axial crushing analysis of car frontal impact hybrid absorbers

Costas, Miguel; Díaz, J.; Romera, Luis; Hernández, Santiago; Tielas, A.

doi:10.1016/j.ijimpeng.2013.06.011

Cited by 82 publications

(38 citation statements)

References 46 publications

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“…Today's vehicles have passenger-safety devices designed to absorb the energy due to an impact, and therefore increased attention has been focused on the crashworthiness. In these applications, a crushable material is added to the structure to increase the crushing strength and the energy-absorption capabilities [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Dynamic crushing behaviour of agglomerated cork

Sánchez-Sáez

García-Castillo

Barbero

et al. 2015

Materials & Design (1980-2015)

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-For reasons of energy saving and pollution reduction, there is a growing interest in the development of lightweight structures manufactured with materials of natural origin and recyclable. Agglomerated cork is a mixture of natural cork and an organic binder, and can be considered an alternative to polymeric foams used in structural applications with a high capacity of energy absorption. One of these applications involves impact-absorbing elements in vehicles, which are subjected mainly to dynamic compressive loads. In this work, the dynamic crushing behaviour of agglomerated cork was experimentally studied, analysing the influence of the specimen thickness on the energy-absorption capacity, contact force, displacement, and strain. Dynamic crushing tests with specimens of four different thicknesses were performed in a drop-weight tower. An increase in the maximum contact force, displacement, and strain was observed when the impact-energy/thickness ratio increased. For each specimen thickness a linear variation of the maximum displacement and energy absorbed with the impact-energy/thickness ratio was found. It was observed that the energy absorbed by agglomerated cork did not depend on the specimen thickness, but only on the impact energy.

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Section: Introductionmentioning

confidence: 99%

“…In vehicles, the energy-absorbing elements designed to withstand frontal impact are often designed to work in compression [18]. The mechanical behaviour under quasi-static compression of the agglomerated cork is the one typical of a cellular material.…”

Section: Introductionmentioning

confidence: 99%

Dynamic crushing behaviour of agglomerated cork

Sánchez-Sáez

García-Castillo

Barbero

et al. 2015

Materials & Design (1980-2015)

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“…Sanchez-Saez et al [18] structure thin plates of aluminum with a cork core, they increased the energy absorption in 30% when compared to a structure without the cork core for impacts of 300 J of energy. Costas et al [19] studied cork as part of a frontal car hybrid impact absorber.…”

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confidence: 99%

Static and dynamic mechanical response of different cork agglomerates

et al. 2015

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a b s t r a c tCork is a natural cellular material capable of withstanding considerable amounts of energy and exhibiting a viscoelastic return to its original shape. This feature is particularly interesting to resist to successive impacts. In this study, the behavior of different types of agglomerated cork (AC) and expanded cork (EC) is investigated under static and dynamic loadings. Double impact was carried out on the samples using a hemispheric actuator. The peak acceleration data for all compounds were further analyzed. Static compression tests gave an interesting insight into the stress-strain curve of agglomerates and Poisson's ratio variation during deformation. Results demonstrate a clear influence of agglomerated density and grain size on the resulting mechanical properties and point out a tremendous potential for this sustainable material to be tailored to fit diverse crashworthiness applications.

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“…This has been checked in the simulations and it has been found that the imposed imperfections in the GFRP triggered a stronger interaction with the foam, leading to a more intensive degradation of the GFRP and a higher crushing force. The effects derived from a misalignment of the GFRP were also observed in [28].…”

Section: Validation Of the Finite Element Model Of The Componentmentioning

confidence: 81%

“…The inner reinforcement of metal tubes with composite structures has been recently studied by Costas et al [28,29], motivating the present investigation. The beneficial contribution of an inner GFRP skeleton to the crashworthiness of a steel tube was stated, but it was also observed that the efficiency of the design could be significantly enhanced with some kind of constraining or confinement system which prevented the GFRP parts from falling apart after incipient fracture.…”

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confidence: 89%

Static crushing of aluminium tubes filled with PET foam and a GFRP skeleton. Numerical modelling and multiobjective optimization

Costas

Morin

Langseth

et al. 2017

International Journal of Mechanical Sciences

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This investigation focuses on the multiobjective optimization of a crash box subjected to static loading by using a validated numerical model and an analytical approach. The crash box is made with a unique combination of three materials: an aluminium tube filled with polyethylene terephthalate (PET) foam and a glass-fibre reinforced polymer (GFRP) skeleton. A finite element model was calibrated based on the results obtained in a material testing campaign using appropriate constitutive equations. A J2-plasticity model was used for the material behaviour of the aluminium alloy, and the PET foam was modelled using Deshpande and Fleck's model. Regarding the short-fibres GFRP, a Voce plasticity model was fitted to the experimental data. After a successful validation of the finite element model, the filled aluminium tube was subjected to a structural optimization to achieve the best crash performance. Three relevant design variables were selected: the thickness of the outer aluminium cylinder, the thickness of the GFRP and the density of the PET foam, the last being related to the crushing strength of the foam. Given the high computational cost of each finite element model, a multi-adaptive regression splines metamodel was fitted to a large-scale sampling. Optimum pairs were obtained for the absorbed energy, the specific energy absorption, the peak load and the mass of the com- the component over the design region selected for the optimization, and was also used for its optimization with satisfactory results.

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Static and dynamic axial crushing analysis of car frontal impact hybrid absorbers

Cited by 82 publications

References 46 publications

Dynamic crushing behaviour of agglomerated cork

Dynamic crushing behaviour of agglomerated cork

Static and dynamic mechanical response of different cork agglomerates

Static crushing of aluminium tubes filled with PET foam and a GFRP skeleton. Numerical modelling and multiobjective optimization

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