Finite element modeling of Balsa wood structures under severe loadings

Toson, Bernard; Viot, Philippe; Pesqué, Jean-Jacques

doi:10.1016/j.engstruct.2014.03.017

Cited by 22 publications

(13 citation statements)

References 34 publications

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“…But when plywood is used for packaging, the contact behaviour between the plywood and transported goods or external projectiles is of primary interest. For example, Toson et al and Adalian and Morlier studied the behaviour of balsa wood used to transport nuclear material, focusing on the strain rate sensitivity and cushioning properties of the balsa wood at ambient temperature. In liquefied natural gas (LNG) shipping transport, the temperature of the LNG is about −163° C .…”

Section: Introductionmentioning

confidence: 99%

High strain rate out‐of‐plane compression of birch plywood from ambient to cryogenic temperatures

Caetano

Grolleau

Galpin

et al. 2018

Strain

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An extensive series of compression tests with birch plywood specimens is conducted in the out‐of‐plane direction. Various experimental conditions are tested with different temperatures and strain rates. To this end, a specially designed Split Hopkinson pressure bar protocol is defined, and the specimen dimensions are validated from quasi‐static EN789 standards experiments. Temperatures are ranging from ambient down to −170°C, while strain rates are increased from 0.004/s up to 700/s. The analysis of the experimental results focuses on the hardening behaviour and the following densification regime at large strains. Evolution with temperature and strain rate of the four coefficients of the stress versus strain curve interpolation is discussed, and models are proposed.

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Section: Introductionmentioning

confidence: 99%

High strain rate out‐of‐plane compression of birch plywood from ambient to cryogenic temperatures

Caetano

Grolleau

Galpin

et al. 2018

Strain

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“…The balsa wood core supplied by Baltek is reported to have optimum physical properties due to its honeycomb-like cell structure obtained by cutting perpendicular to the grain direction. Toson et al [29] reported that wood material such as balsa is of particular interest for application as a core material in sandwich panels because of its transversely isotropic behaviour, i.e., it is stiff and strong in the direction of the fibres (axial) and transversely compliant (in directions that are tangential and radial to it growth rings). The expanded polystyrene foam supplied by Polyfoam is a closed cell thermoplastic cellular plastic material and is chosen for its excellent energy absorbing and damping properties.…”

Section: Materials Usedmentioning

confidence: 98%

“…A maximum effective plastic strain of 0.21 controls the material failure in the facesheet. The Balsa wood is stiff and strong in the grain direction but transversely compliant, so this transversely isotropic material behaviour must be taken into consideration in modelling [29,34]. The Balsa wood core was modelled using a transversely isotropic material model developed for wood, available in the material library as MAT143.…”

Section: Setup Of Numerical Modellingmentioning

confidence: 99%

Experimental study of the medium velocity impact response of sandwich panels with different cores

2016

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The impact response of sandwich panels is not only dependent on the facesheet but also on the core material. This paper compares the dynamic response of sandwich panels with different core materials when subjected to medium velocity impacts. The sandwich panels were made of aluminium facesheets with five different cores, viz., low density balsa wood, high density balsa wood, cork, polypropylene honeycomb, and polystyrene foam. All the specimens were impacted by an instrumented projectile with a hemispherical steel head at three impact energies of 43, 85 and 120 J. An accelerometer attached to the projectile and a high speed camera were used to collect data and record the impact process. 3D scanning technique was used to measure the deformation of front and back faces after impact. The impact properties of the sandwich panels with the five different cores were compared in terms of contact force, energy absorption, depth of indentation, overall bending deflection, etc. Post-mortem sectioning was conducted to examine the impact induced failures such as facesheet rupture, crush of core material, and debonding between facesheet and core. Finite element modelling was also carried out to elucidate the observed experimental results and further understand the effect of core material.

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“…Those subjected to radial compression, the modulus of elasticity and strength varied non-linearly (Borrega and Gibson 2015). In a recent study (Toson et al 2014), a complex model was developed to determine the response of balsa wood material subjected to different load types. To validate the proposed model, numerous experimental tests and finite element analyses were conducted to determine its performance.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Static and Fatigue Behavior of CFRP-Balsa Sandwiches under Three-point Flexural Loading

Zaharia¹,

Morariu²,

Nedelcu³

et al. 2017

BioResources

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Balsa wood is a natural cellular material with an excellent resistance-toweight ratio that is ideal for manufacturing the core of sandwich structures. In this study, sandwich specimens with a carbon-fiberreinforced polymer (CFRP) skin and a balsa wood core were tested with static and dynamic loading. Three-point flexural tests in static regime determined the mechanical characteristics of the CFRP-balsa specimens that were needed for subsequent fatigue strength tests. Also, experimental research was performed on the Charpy impact response of the CFRP-balsa sandwich specimens. This study implemented an accelerated fatigue testing method to identify and predict the mean fatigue life of the CFRP-balsa sandwich specimens subjected to cyclic fatigue via three-point flexural tests. Using the accelerated fatigue and the three-point flexural testing methodology on the CFRP-balsa sandwich specimens, the testing period was reduced by 11.9 times, and thus the material costs necessary for the tests were also reduced. Also, the breaking surfaces were analysed to reveal the failure modes of CFRP-balsa specimens subjected to static and fatigue tests at threepoint flexural and at impact tests.

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Finite element modeling of Balsa wood structures under severe loadings

Cited by 22 publications

References 34 publications

High strain rate out‐of‐plane compression of birch plywood from ambient to cryogenic temperatures

High strain rate out‐of‐plane compression of birch plywood from ambient to cryogenic temperatures

Experimental study of the medium velocity impact response of sandwich panels with different cores

Experimental Study of Static and Fatigue Behavior of CFRP-Balsa Sandwiches under Three-point Flexural Loading

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