Skip to Main content Skip to Navigation
Theses

Caractérisation et simulation numérique du comportement mécanique des mousses de nickel : morphologie tridimensionnelle, réponse élastoplastique et rupture

Abstract : The deformation behaviour and failure of nickel foams were studied during loading by using X-ray microtomography. Strut alignment and stretching are observed in tension whereas strut bending followed
by strut buckling are observed in compression. Strain localisation, that occurs during compression tests, depends on nickel weight distribution in the foam. Fracture in tension first takes place at cell nodes and the crack propagates cell by cell. The damaged area in front of a crack is about five cells wide. A detailed
description of the three-dimensional morphology is also presented. One third of the cells are dodecahedra and 57 % of the faces are pentagonal. The most frequent cell is composed of two quadrilaterals, two hexagons and eight pentagons. The dimensions of the equivalent ellipsoid of each cell are identified and
cell orientation are determined. The geometrical aspect ratio is linked to the mechanical anisotropy of the foam.
Complete list of metadatas

Cited literature [116 references]  Display  Hide  Download

https://pastel.archives-ouvertes.fr/tel-00007530
Contributor : Admin Pastel <>
Submitted on : Wednesday, December 1, 2004 - 5:08:56 PM
Last modification on : Thursday, September 24, 2020 - 6:30:06 PM
Long-term archiving on: : Friday, April 2, 2010 - 8:43:32 PM

Identifiers

  • HAL Id : tel-00007530, version 1

Citation

Thierry Dillard. Caractérisation et simulation numérique du comportement mécanique des mousses de nickel : morphologie tridimensionnelle, réponse élastoplastique et rupture. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2004. Français. ⟨tel-00007530⟩

Share

Metrics

Record views

1078

Files downloads

1826