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Metamaterials for Mechanical, Biomechanical and Multiphysical Applications Research Group (METAMAT)

1. Introduction

Creating novel materials with enhanced performance and «superior» properties has been a primal engineering challenge since the very early days of science. The material development quest can been well explained by the fact that any technological progress is dependent on the range of properties of the available materials. Metamaterials have opened new frontiers in engineering, making feasible considerable technological progresses in different fields. Up to now, no systematic approach has been developed for the design and characterization of microstructures that lead to metamaterials with tunable anisotropic properties

2. Mission and vision

The main objective of the project is to design new metamaterials with exceptional static and dynamic properties based on multiscale topology optimization methods and micromechanical approaches in order to go beyond heuristics and explore novel microstructural designs. The wide range of potential applications of such architectured materials with exceptional mechanical and multiphysical properties motivates the modeling, numerical and experimental tools that will be developed in the project. These novel designs will find especially applications in seismic isolation by tuning the transition from shear soft to shear stiff microstructures when moving from small to large strains, or biosusbstitutes for bone and ligaments satisfying multiobjective criteria. Enriched constitutive models in the static and dynamic range accounting for internal scale effects will be developed using dedicated homogenization methods, like micromorphic constitutive models. Innovative measurement protocoles will be conceived in order to identify the higher order multiphysical properties (piezoelectricity and flexoelectricity) and develop local field analysis to assess the microstructural mechanisms responsible for the observed enriched mesoscopic and macroscopic behaviors

3. Research topics

The potential of periodic architectured materials in engineering and biomechanical applications shall be revisited in order to find yet unexplored designs with exceptional unreached multiphysical properties. The following research directions will especially be pursued:

  • Considering first the static regime, compute and characterize the plastic, brittle and plastic collapse properties of repetitive network materials, in bot static and dynamic situations;
  • Design microstructures of architectured materials for mitigating vibrations in the small and large strains regimes; we especially intend to specify the microstructural topology and the viscosity parameters necessary for metamaterials to exhibit favorable vibration and acoustic characteristics (band gaps, high wave absorption coefficients) in frequency ranges and for wave propagation modes typically not encountered in common or existing artificial materials;
  • Model and simulate bone damage and fracture considering adequate criteria and perform FE simulations using XFEM; Validate such models based on experimental biomechanics;
  • Develop multi-objectives topology optimization methods including morphological, mechanical, and electromechanical design criteria. The exhibited designs of architectured materials will find applications in the design of bone biosubstitutes. We aim to determine microstructures that allow for biomimetic material response so as to furnish bioengineering solutions to current medical challenges, or to propose metamaterials with non-standard mechanical responses to fulfil clinical requirements;
  • Develop biomimetic optimization methods based on evolutionary models for living tissue biological evolution, like bone internal and external remodeling or its progressive calcification;
  • Develop high frequency homogenization methods for network and architectured materials;
  • Incorporate surface effects that are pregnant at small scales (few nanometers) into the homogenized models predictive of the effective properties;
  • Guide additive manufacturing techniques by topology optimization methods. In this way, optimality of the searched properties will be achieved; Morphological and mechanical characterization of the obtained structures, and fabrication of scaffolds and substitutes for biomedical applications.  
  • Implement the developed enriched constitutive models in structural computations at the macroscopic level in engineering and biomechanical applications using numerical methods having the ability to detect instabilities and follow bifurcation paths. This will provide with reliable computational models of tissues, joints or members in order to guide the design of orthopedic materials, rehabilitation protocols, surgery planning or safety equipment

4. Current members

Dr. Ganghoffer Jean-François


Dr. Ganghoffer Jean-François
Positions: Head of Metamaterials for Mechanical, Biomechanical and Multiphysical Applications Research Group
Areas of expertise: Mechanics of generalized continua – Homogenization methods; Shape and Topology optimization for the design of microstructures; Mechanics of fibrous materials; Symmetries and master curves of dissipative materials. Model reduction; Biomechanics: Growth of biological tissues. Bone remodeling. Mechanics of soft biological; Tissues (ligament, tendons). Tissue engineering of ligaments and tendons; Statics and dynamics (vibration, dispersion properties) of lattice materials and metamaterials
Editorship: Mechanics Research Communications
Research track record:
• ISI papers: 140
• Total ISI Citations: 2.426
• ISI H-index: 20
• At most 5 top journals:
- Journal of the Mechanics and Physics of Solids;
- Materials and Design;
- International Journal of Engineering Science;
- International Journal of Solids and Structures;
- ARMA (Archives for Rational Mechanics and Analysis)

Dr. Laurent Cédric


Dr. Laurent Cédric
Positions: Member of Metamaterials for Mechanical, Biomechanical and Multiphysical Applications Research Group
Areas of expertise: Biomechanics, tissue engineering, non-linear mechanics, computational mechanics, experimental mechanics, mechanobiology, medical imaging, fibrous media. Focuses : ligament tissue engineering, long bone computational modeling, bone calcification

5. Former members (name, title, picture)

6. Publications (ISI or Scopus only)

7. Contact: Click here