Insight into the physics of foam densification via numerical simulation

Bardenhagen, S.G.; Brydon, Andrew; Guilkey, James

doi:10.1016/j.jmps.2004.09.003

Cited by 56 publications

(32 citation statements)

References 31 publications

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“…Numerical representation of the foam's heterogeneous and anisotropic microstructure presents a virtual testing challenge [107,108]. The carbon foam geometry is often modelled by using CAD to create the bubbles and the foam structures as illustrated in Figure 21 for a 4 3 mm 3 carbon foam model created in CATIA.…”

Section: Foam Structuresmentioning

confidence: 99%

Virtual testing of advanced composites, cellular materials and biomaterials: A review

Okereke

Akpoyomare

Bingley

2014

Composites Part B: Engineering

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Please cite this article as: Okereke, M.I., Akpoyomare, A.I., Bingley, M.S., Virtual testing of advanced composites, cellular materials and biomaterials: a review, Composites: Part B (2014), doi: http://dx.doi.org/10. 1016/ j.compositesb.2014.01.007 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThis paper documents the emergence of virtual testing frameworks for prediction of the constitutive responses of engineering materials. A detailed study is presented, of the philosophy underpinning virtual testing schemes: highlighting the structure, challenges and opportunities posed by a virtual testing strategy compared with traditional laboratory experiments. The virtual testing process has been discussed from atomistic to macrostructural lengthscales of analyses. Several implementations of virtual testing frameworks for diverse categories of materials are also presented, with particular emphasis on composites, cellular materials and biomaterials (collectively described as heterogeneous systems, in this context). The robustness of virtual frameworks for prediction of the constitutive behaviour of these materials is discussed. The paper also considers the current thinking on developing virtual laboratories in relation to availability of computational resources as well as the development of multi-scale material model algorithms. In conclusion, the paper highlights the challenges facing developments of future virtual testing frameworks. This review represents a comprehensive documentation of the state of knowledge on virtual testing from microscale to macroscale length scales for heterogeneous materials across constitutive responses from elastic to damage regimes.

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Section: Foam Structuresmentioning

confidence: 99%

Virtual testing of advanced composites, cellular materials and biomaterials: A review

Okereke

Akpoyomare

Bingley

2014

Composites Part B: Engineering

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“…Comme évoqué dans la littérature [1,17], durant la phase de plateau, on observe une localisation des déformations en bandes perpendiculaires à la direction de la compression, cf. figure 1.…”

Section: Compression Cyclique Et Localisation Des Déformationsunclassified

“…Si on appelle ε i l'élongation du i-ème élément et ε 0 l'élongation imposée, on a toujours la condition (1). De plus, la force transmise entre tous les éléments doit être la même.…”

Section: Le Modèle Completunclassified

“…Le phénomène de localisation des déformations est bien connu et de nombreux auteurs ont proposé des modèles pour l'expliquer [1,4,5,9]. Le plus souvent, ces modèles se basent sur une approximation où les parois bordant la cellule sont représentés par des poutres et la localisation des déformations est expliquée par les instabilités de flambage.…”

Section: Introductionunclassified

“…Avec une identification convenable des paramètres constitutifs du modèle, on a obtenu un bon accord entre la simulation et les résultats expérimentaux Toutefois ce modèle purement élastique n'est pas capable de décrire complètement la réponse des mousses polymériques lorsqu'elles sont soumises à une compression cyclique. En effet, il ne peut pas décrire : [1] la dépendance de la réponse à la vitesse de chargement, [2] la perte progressive de résistance à la charge augmentant avec le nombre de cycles, [3] l'effet de mémoire, qui consiste en un recouvrement de la résistance initiale après une phase de repos. La dépendance de la réponse à la vitesse de chargement est une caractéristique des matériaux visqueux.…”

Section: Introductionunclassified

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Un modèle viscoélastique pour la réponse des mousses polymériques à la compression cyclique

Piero

Pampolini²

2009

Mécanique & Industries

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Résumé :Sous compression cyclique, les mousses polymériques montrent une perte progressive de Abstract : A block of polyurethane foam subject to cyclic compression exhibits a softening phenomenon as the number of cycles increases. In particular, one observes a stepping down of the loading curves while the unloading curves remain the same. In tests performed by the authors, it has been observed a partial recovery of the initial stiffness after a resting period. Indeed, this behaviour can be described as a long memory effect. We propose a viscoelastic model, coupling a non convex energy with a dissipation of viscous type. The model is in a good qualitative agreement with the experiments.Mots clefs : mousse polymérique, localisation des déformations, énergie non convexe, dissipation visqueuse, mémoire à long terme.

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