Characterization of cork and cork agglomerates under compressive loads by means of energy absorption diagrams

Buil, Ramón Miralbés; Ranz, David; Ivens, Jan; Gómez, José Antonio

doi:10.1007/s00107-020-01625-7

Cited by 11 publications

(7 citation statements)

References 41 publications

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“…It can be seen that the energy density increases with the increase in the strain rate. The trends of energy density under high strain rate deformation in previous studies are similar to the results obtained in this test, as the energy density changed linearly with the increase in strain rate [54,55]. However, under a high strain rate, the energy density value varies in a wide range.…”

Section: Energy Absorptionsupporting

confidence: 89%

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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Section: Energy Absorptionsupporting

confidence: 89%

Evaluation of Energy Absorption Capabilities of Polyethylene Foam under Impact Deformation

2021

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“…For the last fifty years, expanded polystyrene foams (EPS) have been the most common materials used to absorb energy in lightweight applications such as different types of helmets. Nevertheless, these materials have some drawbacks, such as a low resilience, which implies an inability to absorb multiple impacts 6,27 , limitation on increasing the specific energy absorption 11 , low recyclability (especially in helmets that combine multiple materials), high thermal insulation [4], and limitation in producing foam with different stiffnesses. Some studies 14 have pointed out that owing to the various stiffnesses and vulnerabilities of different brain regions, it is essential to develop new helmets by tailoring material properties of the inner liner depending on the part of the head to be protected.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of mechanical properties and energy absorption capabilities of functionally graded and non-graded thermoplastic sheet gyroid structures

Buil

Higuera

Ranz

et al. 2021

Mechanics of Advanced Materials and Structures

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Comparative analysis of mechanical properties and energy absorption capabilities of functionally graded and non-graded thermoplastic sheet gyroid structuresAdditive manufacturing allows the tailoring of the structure of energyabsorbing materials. It is thus feasible now to use light, printed structures instead of other materials such as foams and honeycombs, signifying greater possibilities for customization. Some of these structures are triply periodic minimal-surface structures that is a family of different structures like the gyroid one. Another benefit of additively manufactured graded structures, which foams or honeycombs lack, is the flexibility to vary the internal parameters along one or more directions. This study focuses on the comparative analysis of graded and non-graded gyroid structures for four common thermoplastic materials used in additive manufacturing.These structures are compared with each other under quasi-static compression testing, as well as with expanded polystyrene foam and solid samples of the thermoplastic materials. The analysis includes investigation of the stress-strain and specific stress-strain curves, capability of absorbing energy per unit weight and per unit volume, ideality, total efficiency, and normalized energy vs. normalized stress characteristics.We also analyze the internal fracture mechanism of the structures. The objective is to obtain more extensive knowledge of the behavior of nongraded structures.

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“…These mechanical properties can be modified by controlling the density during the foaming process [1,2]. Some researchers concluded that this behavior mode applies to corks and cork products [10] and lattice structures [17].…”

Section: 𝑊 = ∫ 𝜎(𝜀) 𝑑𝜀mentioning

confidence: 99%

“…Therefore, it is necessary to search for alternative materials. Some researchers have examined natural materials [9], such as cork and cork agglomerates [10], biocomposites [11], and mycelium basis materials [12]. Although these materials have renewable origin and could be easily recycled and/or decompose, they present the same limitation as the EPS: they cannot be tailored zone by zone to modify their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of diamond lattice structures based on main parameters and strain rate

Buil

Santamaria

Ranz

et al. 2022

Mechanics of Advanced Materials and Structures

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Mechanical properties of diamond lattice structures based on main parameters and strain rateThe diamond triply periodic minimal surface structure has a high mechanical property-weight ratio. They can be modified by changing their internal parameters or the material. They are generated using the additive manufacturing (AM) that possibilities the use of various materials for generating zones with different mechanical properties or by modifying their internal parameters.However, the effects of internal parameters in the mechanical properties have not been defined in detail. Furthermore, the strain rate modifies these mechanical properties. In this study, the effects of the internal parameters and strain rate were evaluated and additionally, the failure mechanism of the structures.

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Characterization of cork and cork agglomerates under compressive loads by means of energy absorption diagrams

Cited by 11 publications

References 41 publications

Evaluation of Energy Absorption Capabilities of Polyethylene Foam under Impact Deformation

Evaluation of Energy Absorption Capabilities of Polyethylene Foam under Impact Deformation

Comparative analysis of mechanical properties and energy absorption capabilities of functionally graded and non-graded thermoplastic sheet gyroid structures

Mechanical properties of diamond lattice structures based on main parameters and strain rate

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