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Living Reference Work Entry In depth
Micromorphic Crystal Plasticity
The micromorphic approach to crystal plasticity represents an extension of the micropolar (Cosserat) framework, which is presented in a separate chapter. Cosserat crystal plasticity is contained as a special c...
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Living Reference Work Entry In depth
Micropolar Crystal Plasticity
This chapter considers advances over the past 15 years achieved by the authors and coworkers on generalized crystal plasticity to address size and configuration effects in dislocation plasticity at the micron ...
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Article
A fully coupled diffusional-mechanical formulation: numerical implementation, analytical validation, and effects of plasticity on equilibrium
A macroscopic coupled stress-diffusion theory which accounts for the effects of nonlinear material behaviour, based on the framework proposed by Cahn and Larché, is presented and implemented numerically into t...
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Chapter and Conference Paper
Prediction of the Elastic Modulus of the Trabecular Bone Based on X-Ray Computed Tomography
This work aims to estimate the apparent Young’s modulus of real human trabecular bones using a numerical micro-macro approach. Cylindrical specimens of trabecular bone were extracted from human femur heads, cl...
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Article
Mechanisms and Modeling of Bake-Hardening Steels: Part I. Uniaxial Tension
A physically based model for bake-hardening (BH) steels is developed suitable to predict the BH as well as the macroscopic behavior of strain-aged steels in tensile tests, such as the lower yield stress and th...
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Article
Mechanisms and Modeling of Bake-Hardening Steels: Part II. Complex Loading Paths
The strain-path dependence of yield strength and mechanical behavior of bake hardening (BH) steels have been investigated. In addition to standard BH tensile tests, samples have been prestrained in plane tensi...
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Chapter and Conference Paper
Mechanical Behavior of Nickel Base Foams for Diesel Particle Filter Applications
An original processing route by powder metallurgy was developped to alloy pure Ni foams so, that the foam becomes refractory for high temperature applications. The modelling of such a foam at high temperature ...
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Chapter and Conference Paper
On the Size of the Representative Volume Element for Isotropic Elastic Polycrystalline Copper
A computational homogenization strategy is developed to determine the number of grains necessary to estimate the effective elastic properties of isotropic polycrystalline copper with a given precision. Finite ...
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Chapter and Conference Paper
Mechanical Behavior Modeling in the Presence of Strain Aging
In many fields some structural materials are subjected to strain aging, which gives rise to inhomogeneous yielding such as Piobert-Lüders’ bands and Portevin — Le Chatelier instabilities. These phenomena occur...
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Article
Continuum modeling of strain localization phenomena in metallic foams
Aluminium foams obtained by injecting a gas into the liquid metal are prone to localization of strain and damage. Under compression, crushing bands form, multiply and propagate through the whole sample. A cont...
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Article
Investigation on the influence of cell shape anisotropy on the mechanical performance of closed cell aluminium foams using micro-computed tomography
The mechanical behaviour of closed-cell aluminium foams made by both powder metallurgy (LKR) and liquid state (Hydro) processes is investigated. Hydro foams exhibit a significant anisotropy in their mechanical...
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Article
Strain localization at the crack tip in single crystal CT specimens under monotonous loading: 3D Finite Element analyses and application to nickel-base superalloys
Three-dimensional Finite Element simulations of mode I crack tip fields in Compact Tension specimens are presented for elastic ideally-plastic F.C.C. single crystals. The computations are carried out within th...
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Article
Elastoviscoplastic constitutive frameworks for generalized continua
A unifying thermomechanical constitutive framework for generalized continua including additional degrees of freedom or/and the second gradient of displacement is presented. Based on the analysis of the dissip...
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Article
Finite-element calculations of the lattice rotation field of a tensile-loaded nickel-based alloy multicrystal and comparison with topographical X-ray diffraction measurements
A new experimental measurement technique using synchrotron radiation is applied to determine the curvature of the crystallographic lattice within a grain of a multicrystalline specimen after uniaxial tensile l...
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Article
Subgrain formation during deformation: Physical origin and consequences
The formation of subgrains in the course of plastic deformation is explained as a result of a trend to make the deformation easier by locally reducing the number of active slip systems. Local preference of one...
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Chapter
Polycrystalline Plasticity Under Small Strains
After the pioneering work due to Taylor [1], crystal plasticity is a classical topic in the literature. A series of models have been elaborated in the past. Single crystal models came first, with a first type of ...
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Chapter and Conference Paper
Characterization and Simulation of the Mechanical Behaviour of Multilayered Components Composing a Fibrous Cylinder Head Gasket
This paper is devoted to the characterization and the simulation of the mechanical behaviour of multilayered components, that compose the fibrous cylinder head gasket of automotive engines. This structure is c...
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Chapter and Conference Paper
Modelling the Cyclic Behaviour of Two-Phase Single Crystal Nickel-Base Superalloys
The modelling of monotonic and cyclic behaviour of single crystal superalloys using crystal elastoviscoplasticity has proved successful in the last ten years. Within this framework slip processes involving oct...
