Olivier Pierard

Olivier Pierard
Cenaero · Computational Multi-physics Software Development (CMSD)

PhD

About

24
Publications
4,489
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882
Citations
Introduction
Olivier Pierard currently works at the Computational Multi-physics Software Development (CMSD) team, Cenaero, Belgium. Olivier does research in Multi-scale computational Materials with strong interests in damage and fracture mechanics. Most recent publications deal with error-controlled mesh adaptation in fracture mechanics and applications of the Thick Level Set method (damage mechanics).
Additional affiliations
September 2002 - June 2006
Université Catholique de Louvain - UCLouvain
Position
  • PhD Student

Publications

Publications (24)
Article
Full-text available
This paper deals with the micromechanical modeling of polymer composites with viscoelastic-viscoplastic (VE-VP) constituents. Two mean-field homogenization (MFH) models based on completely dissimilar theoretical approaches are extended from elasto-viscoplasticity (EVP) to VE-VP and assessed. The first approach is the incremental-secant method. It r...
Article
Full-text available
This paper aims to optimize additive manufacturing parts containing lattice structures by means of topology optimization. The proposed method relies on numerical homogenization to model the behavior of the mesoscale lattices inside the macroscale component with an equivalent material model. While the topology of the unit cell is fixed a priori, the...
Preprint
Full-text available
Additive manufacturing is capable of producing lightweight structures by introducing mesoscale lattice structures in the design without significant additional manufacturing costs. Nevertheless, designing efficient structures including complex lattices remains a challenging task. This paper presents a strategy for the design of additively manufactur...
Article
Full-text available
Modeling restrained shrinkage-induced damage and cracking in concrete is addressed herein. The novel Thick Level Set (TLS) damage growth and crack propagation model is used and adapted by introducing shrinkage contribution into the formulation. The TLS capacity to predict damage evolution, crack initiation and growth triggered by restrained shrinka...
Article
Full-text available
We present a simple error estimation and mesh adaptation approach for 3D linear elastic crack propagation simulations using the eXtended Finite Element Method (X-FEM). A global extended recovery technique Duflot (2008) is used to quantify the interpolation error. Based on this error distribution, four strategies relying on two different mesh optima...
Chapter
The eXtended Finite Element Method (X-FEM), developed intensively in the past 15 years has become a competitive tool for the solution of problems with evolving discontinuities and singularities. In the present study, we focus on the application of X-FEM on frictionless contact problems in the context of fracture mechanics. A promising approach in t...
Conference Paper
Full-text available
This work is dedicated to evaluate the influence of the contact on crack lips on crack path and crack growth rate under multi-axial loading conditions. An important part is dedicated to algorithmic robustness when handling contact in the context of XFEM in presence of crack tip enrichment functions. Crack path predictions as well as crack growth ra...
Article
The present contribution enriches the nowadays “classical” level set implicit representation of geometries with topological information in order to correctly represent sharp features. For this, sharp features are classified according to their positions within elements of the level set support. Based on this additional information, sub-elements and...
Article
Full-text available
In this presentation, an innovative approach for the representation of machining cutting paths based on the level-set method is proposed. During most machining processes, the highest level of distortions usually comes from relaxation of residual stresses so that a simulation at the global scale (i.e.: without taking into account chip forming and to...
Article
A micromechanical model is proposed for multiphase metals consisting of a ductile matrix reinforced by hard, equiaxed inclusions. The model belongs to a class of incremental mean-field theories of the first order and is suitable for general, non-monotonic loading paths. This paper specifically addresses the definition of the effective, instantaneou...
Article
The micromechanics of elasto-viscoplastic composites made up of a random and homogeneous dispersion of spherical inclusions in a continuous matrix was studied with two methods. The first one is an affine homogenization approach, which transforms the local constitutive laws into fictitious linear thermo-elastic relations in the Laplace–Carson domain...
Article
Full-text available
The effective mechanical behavior of an elasto-plastic matrix reinforced with a random and homogeneous distribution of aligned elastic ellipsoids was obtained by the finite element simulation of a representative volume element (RVE) of the microstructure and by homogenization methods. In the latter, the composite behavior was modeled by linearizati...
Article
Full-text available
In the framework of the European project PROHIPP (New design and manufacturing processes for high pressure fluid power product — NMP 2-CT-2004-50546), CENAERO develops a library of constitutive models used to predict the mechanical response of a family of cast iron. The present contribution focuses on one particular microstructure, corresponding to...
Article
This paper deals with the prediction of the overall behavior of a class of two-phase elasto-viscoplastic composites, based on mean-field homogenization. For this, important improvements are made to the recently-proposed affine formulation. The latter theory linearizes the rate-dependent inelastic constitutive equations of each phase’s material and...
Article
Full-text available
This presentation examines the latest developments of the incremental and affine formulations of the local elasto-(visco)plastic constitutive laws in order to apply homogenization schemes developed for composite materials. The core problem of a good evaluation of the macroscopic tangent operator is examined in depth and computed by different manner...
Article
Full-text available
This paper contains a theoretical and numerical investigation of the incremental formulation for the mean-field homogenization of two-phase elastoplastic composites. We study several variants of the formulation and try to understand why some of them give good predictions while others do not. We define six instantaneous operators for a fictitious ho...
Conference Paper
Full-text available
Different formulations for the homogenization of elasto-(visco)plastic composites are examined. In the rate-independent case, a robust and generic incremental formulation using algorithmic tangent operators and implicit time-discretization has been developed. For rate-dependent elasto-plasticity, an affine formulation is adopted which transforms th...
Article
This paper deals with mean-field Eshelby-based homogenization techniques for multi-phase composites and focuses on three subjects which in our opinion deserved more attention than they did in the existing literature. Firstly, for two-phase composites, that is when in a given representative volume element all the inclusions have the same material pr...
Article
A multi-scale constitutive model for the small deformations of semi-crystalline polymers such as high density Polyethylene is presented. Each macroscopic material point is supposed to be the center of a representative volume element which is an aggregate of randomly oriented composite inclusions. Each inclusion consists of a stack of parallel cryst...

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