Hole and notch sensitivity of aluminium replicated foam

Combaz, Etienne; Rossoll, A.; Mortensen, Alicja

doi:10.1016/j.actamat.2010.09.061

Cited by 15 publications

(7 citation statements)

References 52 publications

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“…The peak value of σ ∞ for both the notch geometries slightly exceeds the yield strength of the foam, consistent with the notch strengthening behaviour observed in open-cell metallic foams due to size effects, see for example, Andrews and Gibson [15] and Combaz et al [33].…”

Section: An Attempt To Measure Directly the Cohesive Zone Lawsupporting

confidence: 83%

An assessment of the J-integral test for a metallic foam

Tankasala

Deshpande

et al. 2020

Journal of the Mechanics and Physics of Solids

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An assessment is made of the J-integral test procedure for initial crack growth in an opencell aluminium alloy foam by combining finite element (FE) simulations with experiment. It is found experimentally that a zone of randomly failed struts develops ahead of the primary crack tip, and is comparable in size to that of the plastic zone. Hence, a crack tip J-field is absent at the initiation of crack growth from the primary crack tip. This implies that the measured J IC value and the J versus crack extension ∆a curve cannot be treated as material properties despite the fact that the specimen size meets the usual criteria for J validity. The toughness tests were performed on a single-edge notched bend specimen, and crack extension was measured by the direct current potential drop method, by digital image correlation and by X-ray computed tomography. The crack growth resistance of the foam is associated with two distinct zones of plastic dissipation: (i) a bulk plastic zone emanating from the crack tip (containing a cluster of randomly failed struts), and (ii) a crack bridging zone behind the advancing crack tip. The applicability of a cohesive zone model to predict the fracture response is explored for the observed case of large scale bridging. To do so, FE simulations are performed by replacing the discrete lattice of the open-cell metallic foam by a compressible, elastic-plastic hardening solid while the fracture process zone in the foam is represented by a cohesive zone, as characterised by a tensile traction versus separation law. A detailed comparison of the cohesive zone model with experimental observations reveals that it is possible to capture the load versus displacement response but not the details of the fracture process zone using a single set of process zone parameters.

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Section: An Attempt To Measure Directly the Cohesive Zone Lawsupporting

confidence: 83%

An assessment of the J-integral test for a metallic foam

Tankasala

Deshpande

et al. 2020

Journal of the Mechanics and Physics of Solids

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“…Up to now there are only few studies investigating notch effect on foam and porous materials mainly regarding metallic foams [6 -8] and polymeric foams [6,9]. The notch effect was experimentally investigated [6,9], but also computational studies [7,8] were performed. The Theory of Critical Distances (TCD) was proved to be an useful engineering tool to predict the failure of notched components for different types of materials [10 -12].…”

mentioning

confidence: 99%

The notch effect on fracture of polyurethane materials

Voiconi¹,

Negru²,

Linul³

et al. 2014

Frattura Ed Integrità Strutturale

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This paper investigates the fracture properties and notch effect of PUR materials with four different densities. The asymmetric semi-circular bend specimen was adapted to perform mixed mode fracture toughness tests. This semi-circular specimen with radius R, which contains an edge crack of length a oriented normal to the specimen edge, loaded with a three point bending fixture, was proved to give wide range of mixed modes from pure mode I to pure mode II, only by changing the position of one support. Different types of notched specimens were considered for notch effect investigations and the Theory of Critical Distances was applied. It could be seen that the critical distances are influenced by the cellular structure of investigated materials.

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“…So, the influence of notches on the strength of PUR structures should be assessed. There are only few analytical and experimental studies investigating the notch effect on foam and porous materials, mainly regarding metallic foams [6][7][8] and polymeric foams [6,9].…”

Section: Introductionmentioning

confidence: 99%