An experimental and numerical survey into the potential of hybrid foams

Hohe, Jörg; Beckmann, Carla; Böhme, Wolfgang; Weise, Jörg; Reinfried, Matthias; Luthardt, Fabian; Rapp, Florian; Diemert, Jan

doi:10.1016/j.mechmat.2019.103063

Cited by 9 publications

(4 citation statements)

References 30 publications

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“…Sandwich structure is a typical lightweight structure with high strength and low weight, and it also exhibits excellent vibration and noise isolation performances 1–3 . Therefore, it has been widely applied in various fields such as automotive, aerospace, and rail transportation 4–10 . Usually sandwich structures are straight.…”

Section: Introductionmentioning

confidence: 99%

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Manufacturing and mechanical testing of curved sandwich beams with zero‐Poisson's ratio honeycomb cores

Cao,

Bao,

Bai

et al. 2023

Polymer Composites

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In this research, free curling property of the over‐expanded honeycomb (OH) with zero Poisson's ratio was utilized to design and manufacture curved carbon fiber‐reinforced composite (CFRC) sandwich beams by hot compression molding technique and co‐curing process. Three‐point bending experiments were conducted to reveal the failure mechanism of these OH‐based curved sandwich beams with various curvatures. The results reveal that in this research no matter what the curvature is, the shearing fracture of the OH core controls the initial failure of the curved structure, which is followed by upper skin fracture, lower skin delamination and fracture. With the increase of curvature, the ultimate bearing capacity and flexural rigidity of the curved beams will increase. No debonding was observed in the experiments.Highlights Curved sandwich beams with zero‐Poisson's ratio honeycomb‐core was designed. Deformation process from arc, flattening to anti‐arc was revealed by testing. Strength of curved sandwich beams depends on shear strength of the honeycomb. Beams with smaller curvature have greater bearing capacity and stiffness.

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Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Therefore, it has been widely applied in various fields such as automotive, aerospace, and rail transportation. [4][5][6][7][8][9][10] Usually sandwich structures are straight. However, in practical applications, many components have curvature, so curved sandwich beams have become a research focus.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and mechanical testing of curved sandwich beams with zero‐Poisson's ratio honeycomb cores

Cao,

Bao,

Bai

et al. 2023

Polymer Composites

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show abstract

“…Polymeric foams are widely used in protective applications due to their high energy absorption capability [1][2][3], and the properties of a variety of open-cell and closed-cell foams have been widely studied under quasi-static compression [4][5][6], impact, and high strain rate loading conditions [7,8]. Foam materials and other materials can be combined into composite materials with excellent properties as needed [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Energy Absorption Capabilities of Polyethylene Foam under Impact Deformation

2021

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Foams are widely used in protective applications requiring high energy absorption under impact, and evaluating impact properties of foams is vital. Therefore, a novel test method based on a shock tube was developed to investigate the impact properties of closed-cell polyethylene (PE) foams at strain rates over 6000 s−1, and the test theory is presented. Based on the test method, the failure progress and final failure modes of PE foams are discussed. Moreover, energy absorption capabilities of PE foams were assessed under both quasi-static and high strain rate loading conditions. The results showed that the foam exhibited a nonuniform deformation along the specimen length under high strain rates. The energy absorption rate of PE foam increased with the increasing of strain rates. The specimen energy absorption varied linearly in the early stage and then increased rapidly, corresponding to a uniform compression process. However, in the shock wave deformation process, the energy absorption capacity of the foam maintained a good stability and exhibited the best energy absorption state when the speed was higher than 26 m/s. This stable energy absorption state disappeared until the speed was lower than 1.3 m/s. The loading speed exhibited an obvious influence on energy density.

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“…The reason for this state is mechanical properties of cellular materials, which can undergo large deformation and remain in low state of stress at the same time. The densification level corresponding to the yield stress is in the range of 60-90% [14][15][16][17]. In work [15] was shown that the maximum of the efficiency identifies the condition For optimal energy absorption of the foam, while the maximum stress reaches a value limited through other design considerations.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Kaczyński¹,

Karliński²,

Hawryluk³

2020

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Following paper is focused on experimental and numerical studies of the behavior and energy absorption for both: quasi-static and dynamic axial crushing of thin-walled cylindrical tubes filled with foam. The experiments were conducted on single walled and double walled tubes. Unfilled profiles were compared with tubes filled with various density polyurethane foam. All experiments were done in order to possibility of the safety of the elements absorbing collision energy which can applied in car body. The dynamic nonlinear simulations were carried out by means of PAM-CRASH™ explicit code, which is dedicated calculation package to modelling of crush. Computational crushing force, plastic hinges locations and specimens post-crushed geometry found to be convergent with the real experiments results. Conducted experiments allowed to draw conclusion, that crashworthiness ability is directly proportional to foam density. The investigation of the experimental data revealed, that double walled tubes have greater energy absorbing ability. A proposed investigation enable to analyze and chosen of optimal parameters of these elements, which can use in automotive industry as an absorption energy components.

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An experimental and numerical survey into the potential of hybrid foams

Cited by 9 publications

References 30 publications

Manufacturing and mechanical testing of curved sandwich beams with zero‐Poisson's ratio honeycomb cores

Manufacturing and mechanical testing of curved sandwich beams with zero‐Poisson's ratio honeycomb cores

Evaluation of Energy Absorption Capabilities of Polyethylene Foam under Impact Deformation

Archives of Metallurgy and Materials

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