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Liste des publications du LMPS

Affichage des publications 1391 à 1400 sur 1401 au total

Mechanics of materials

Anisotropic damage law of evolution

Abstract – A formulation for anisotropic damage is established in the framework of the principle of strain equivalence. The damage variable is still related to the surface density of microcracks and microvoids and, as its evolution is governed by…

Jean Lemaitre, Rodrigue Desmorat, Maxime Sauzay

European Journal of Mechanics - A/Solids -

Mechanics of materials

Quasi-unilateral conditions in anisotropic elasticity

A thermodynamic framework is proposed to model anisotropic elasticity different in tension and in compression. Based on Kelvin decomposition of the compliance tensor, it applies to any 3D loading. Coupling with damage is made considering fourth- and…

Rodrigue Desmorat

Comptes rendus de l’Académie des sciences. Série IIb, Mécanique -

Mechanics of materials

Multiaxial creep–fatigue under anisothermal conditions

Because creep–fatigue is mainly studied in uniaxial tension, it is shown here how to proceed to perform both experiments and calculations under multiaxial loading and when the temperature varies both in time and space. The constitutive equations…

Jean-Philippe Sermage, Jean Lemaitre, Rodrigue Desmorat

Fatigue and Fracture of Engineering Materials and Structures -

Mechanics of materials

Evolution law for anisotropic damage

A formulation for anisotropic damage is established in the framework of the principle of strain equivalence. The damage variable is still related to the surface density of microcracks and microvoids, and, as its evolution is governed by the plastic…

Jean Lemaitre, Rodrigue Desmorat, Maxime Sauzay

Comptes rendus de l’Académie des sciences. Série IIb, Mécanique -

Mechanics of materials

A two scale damage concept applied to fatigue

The ductile type of damage is a phenomenon now well understood. Once the fully coupled set of constitutive equations is identified, Damage Mechanics is a powerful tool to predict failure. Brittle materials do not exhibit such a damageable…

J. Lemaitre, J.P. Sermage, Rodrigue Desmorat

International Journal of Fracture -

Mechanics of materials

Singularities in bi-materials: parametric study of an isotropic/anisotropic joint

Problems in fracture mechanics are frequently solved in terms of crack tip singularities. Geometries other than cracks also exhibit singular stresses at points such as comers, edges and interfacial joints. Comers occuring in monolayers or…

Rodrigue Desmorat, F.A. Leckie

European Journal of Mechanics - A/Solids -

Mechanics of materials

Stress Singularities Applied to Crack Initiation by Damage of Multimaterial Joints

We consider a multimaterial consisting of dissimilar layers submitted to plane deformations. The elastic stress field at any corner of this kind of joint often exhibits a stress singularity expressed as a function of the r-θ polar coordinates by σ_…

Rodrigue Desmorat, Jean Lemaitre

Mechanics of Materials -

Mechanics of materials

Singular fields for a bi-material in anisotropic plane elasticity

Using the anisotropic complex potential method, the singular stress field at a corner of a bi-material is derived in the case of complete anisotropy. The singularity exponent is shown to be a root of a 2×2 matrix determinant. The closed-form…

Rodrigue Desmorat

Comptes rendus de l’Académie des sciences. Série IIb, Mécanique, physique, astronomie -

Mechanics of materials

Reinitiation of a crack reaching an interface

We consider here a bi-material made of two layers bonded together by an interface. The specimen is loaded in tension parallel to the interface and the existence of a mode I crack is assumed. The crack initiated in just one layer reaches the…

J. Lemaitre, Rodrigue Desmorat, M. Vidonne, P. Zhang

International Journal of Fracture -