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Mechanics of polymers and metallic glasses - Experiments and models
Both polymers and metals can be in an organized crystalline or amorphous glassy state, where for polymers usually at least a part of the structure is amorphous and metals are in a glassy state only when processed under special conditions.
The session focuses on the mechanical properties of amorphous or partly amorphous solid materials and attempts to bridge descriptions found for metallic glasses and polymers, including semi-crystalline polymers, which share some common features (such as a rate- and temperature-dependent response, being prone to strain localization in the form of shear bands, the occurrence of damage by cavitation etc.).
Contributions and new developments in the characterization of their elastic-(visco)-plastic response and early stages of damage and failure at different length scales are of interest, as well as continuum and/or atomistic modelling approaches for their mechanical behaviour, including fracture. Combined experimental and numerical approaches for a proper parameter identification and predictions are also welcome.
The topics of this session include, but are not limited to:
- Influence of processing conditions and production methods
- Time and temperature dependent properties
- Constitutive modelling
- Creep and failure
- Ab-initio, atomistic, continuum and multi-scale modelling methods
- Experimental characterization methods
- Novel applications
(Grenoble INP, France)
|Hans van Dommelen|
(TU Eindhoven, The Netherlands)
Mechanics of composites - Experiments and models
Composite materials exhibit outstanding mechanical properties which are ideal for their use in lightweight driven structural applications. However, the lack of reliable and experimentally contrasted models to predict accurately the failure strength and damage evolution makes the optimization process of composite structures to rely on costly and time-consuming experimental campaigns. The difficulties in the simulation of mechanical behavior of composites are endorsed to the natural competition between failure mechanisms operating at different scales from micro to the macro level. Model identification and validation with advanced experimental techniques as well as recent constitutive developments for novel structural composites (textiles, advanced fibers, etc.) will be also welcome. The session includes, but is not limited to the following topics:
- Micro and meso mechanics of structural composites
- Advanced models for novel composite architectures
- Multiscale methods to bridge length scales
- Constitutive modeling of deformation and fracture mechanisms
- Virtual testing. Effect of defects
- Experimental mechanics applied to modeling and parameter identification (e.g. digital image correlation, in-situ experiments and tomography, etc.)
(IMDEA Madrid, Spain)
(Imperial College, United Kingdom)
Mechanics of metals - Experiments and models from nano to micro
In order to establish predictability of mechanical behaviour of metallic materials, insights from the smallest length-scales are needed, along with the development of effective approaches to utilize such fundamental information at larger scales. In this session, we aim to bring experimentalists and modellers together to discuss these critical issues in light of new developments in the area of mechanics of metals. Issues relating to the spatial and temporal evolution of dislocation structures, the influence of microstructural content (e.g., grain boundaries, point defects, second phases) on the deformation, damage and failure mechanisms, and the interplay between experimental observations and predictive models at the nano- and micron-scales are central themes. We strongly encourage contributions that directly couple experiment and modelling approaches.
Topics of interest include:
- microstructural characterization of deformation structures
- dislocation-meditated deformation in small finite or confined volumes
- high fidelity observations or simulations of dislocation processes
- size effects in mechanical behaviour
- atomistic simulations
- discrete dislocation dynamics
- in situ testing (SEM, Synchotron, low or elevated temperature)
- micromechanical consititutive laws (e.g., strain gradient plasticity)
- multiscale bridging approaches
|William A. Curtin|
(HZ Geesthacht, Germany)
Ductile damage and fracture
Ductile damage may be defined as the cause of failure processes involving a significant amount of dissipation which can occur at various length scales. Progression of ductile damage will ultimately lead to fracture. Damage constitutive models may be mechanism based or purely phenomenological in nature. Central to the progress made and the application of damage constitutive models in practice is the development of robust computational models and reliable experimental techniques for the calibration of model parameters. TOPICS of interest are envisioned in the following areas (not restricted to): Damage constitutive models, Initiation of damage, Model for critical damage, Fracture at low stress triaxiality, Experimental methods, Numerical modelling.
(KTH Stockholm, Sweden)
Fatigue, reliability and lifetime predictions
Fatigue is a complex phenomenon that is influenced by a number of factors (e.g. surface finish). It is therefore important to carefully analyze components subjected to fluctuating loads so that the desired reliability can be built into these components and over-designed or under-designed components can be avoided. Accordingly, predicting fatigue life has been one of the most important problems in design engineering for reliability and quality.
This session aims to bring together scientists and researchers from both experimental and modelling field of fatigue research.
Session covers the following areas, although the list is not restrictive:
- Novel experimental methods to characterize fatigue damage and crack growth
- Innovative theoretical approaches, computational and analytical methods
- Experimental and numerical design and validation methods
- Fatigue mechanisms in advanced alloys and metallic systems
- Fatigue under severe conditions environment (corrosion, low temperature, manufacturing process etc.)
- Overload/underload, arbitrary loading sequences, service spectrum loads, combined fatigue regimes
- Residual stress effects on fatigue damage and crack growth, measurement of internal stresses
- Thermal and thermo-mechanical fatigue
- Micro-structurally short cracks
- Assessment of reliability, i.e. estimate of the failure
- Probability-based design criteria
- Life prediction methodologies for structural metals and alloys
- Damage tolerance and fatigue life
- Fatigue of composites and polymers
- Fatigue of Shape Memory Alloys
(IMWF Stuttgart, Germany)
(ENSAM Bordeaux, France)
Failure of quasi-brittle materials
The mini-symposium concentrates on the modelling of quasi-brittle
material failure, understood as the loss of the structural strength
due to the formation of localization bands, propagating cracks and
shear bands. The aim of the mini-symposium is to provide a forum
to present and discuss the progress in computational mechanics modelling
of quasi-brittle materials, in particular concrete, rock and composites.
While contributions in all aspects of quasi-brittle material failure
are invited, some of the topics to be featured are:
- Continuous and discontinuous fracture modelling techniques
- Local and nonlocal damage models
- Dynamic fracture modelling
- Multi-scale and multi-physics modelling techniques
- Modelling of interface failure
- Micro-mechanical modelling of quasi-brittle material failure
- Models for proper representation of reinforcement and anisotropy
(Politcenico di Milano, Italy)
(TU Delft, The Netherlands)
Functional and architectured materials (incl. additively manufactured materials)
The investigation of functional and architecture materials has rapidly advanced in the last decade. The multi-physics nature of functional materials poses multiple challenges in modelling, simulation and designing architectured materials with new functionalities.
Recent advances in material manufacturing, such 3D printing and additive manufacturing, open an exciting opportunity to realise and test pre-designed materials with desirable and pre-defined functionalities.
This session aims to bring together experts in modelling, simulation, manufacturing and experimental investigation in the field of functional and architecture materials to present and discuss recent advances.
Topics of particular interest include
- Electro- and magneto-active elastomers
- Shape-memory and light-sensitive materials
- Acoustic metamaterials
- Responsive gels and Ionic Polymer-Metal Composites (IPMC)
- Ferroic materials
- Microstructural and material instabilities
- Soft biological tissues and bio-inspired materials
- 3D printing of architecture materials and composites
- Selective Laser Melting (SLM) processes
(TU Dortmund, Germany)
Mechanics of interfaces and evolving microstructures (incl. phase transformation and recrystallization)
This Special Session aims at bringing together scientists working across materials science, physics, mathematics, to discuss new models and trends in the field of mechanical aspects of interface behavior and evolving microstructures. The mechanical behavior of many mate- rials of growing interest in materials science (such as composites, granular materials, alloys, liquid crystals and even rocks and masonry) is often strongly influenced by an existing or emergent microstructure (such as microcracks, voids, defects, dislocations, grains/phases in polycrystalline/multiphase materials). Because of the dominance of interfaces, such materials are intrinsically of discrete nature.
The discrete nature of materials can be detected at various length scales, smaller than the macroscopic scale, and directly modeled (grain boundaries, dislocations, disclinations, joints, etc.). Alternatively, in order to avoid computationally cumbersome problems, an effective approach is to derive continuum field descriptions starting from refined descriptions of the materials at the microstructural level and exploiting the advantages of multiscale modeling. Continuum theories suitable to retain memory of the microstructure, taking into account the important role played by material length scales, have non-local character in the presence of in- ternal lengths and spatial dispersion properties, which are crucial features enabling to circum- vent physical inadequacies and well-known theoretical/computational problems of complex material behaviour. Among non-local theories both "explicit"/"strong" and "implicit"/"weak" non-locality is included. Continua with extra degrees of freedom are accounted for as part of the latter case.
In this Session theoretical studies, continuum and multiscale modeling, computational model- ing, experimental results, are welcome, with particular reference to:
- Micromechanics of interfaces;
- Interface crack models;
- Coupling of thermo-mechanical, electro-mechanical, chemo-mechanical behavior at in- terfaces and in microstructured materials;
- Effects of crystal plasticity at interfaces;
- Non-local modeling of microstructured materials;
- Continua with microstructure;
- Microstructure evolution (phase transformation, recrystallization, etc.);
- Description of moving interfaces under various types of driving forces;
- Scale transition strategies.
(Sapienza University of Rome, Italy)
Contact, friction and mechanics of discrete systems (incl. tribology, scratch, indentation, adhesion and granular flows)
Discrete systems, are a challenging, multidisciplinary field, where mechanics meets physics, tribology, particle technology, granular matter, soft matter, active matter, geosciences and civil engineering.
Particulate, granular, discrete, disordered materials are (after water) the second most processed materials in industry and their transport and handling involves severe problems, like avalanches, clustering/agglomeration, damgage/failure or segregation.
Research in this field is challenging, since discrete systems can be in either fluid or in solid state, or both phases can co-exist with particular and interesting mechanisms controlling the transition between fluid and solid states and phases.
Still not fully understood, important contributions have been made using modern tools from physics, statistical mechanics, numerics, and continuum theory, so that research profits from communication among various disciplines and active collaborations and synergy between experiments, simulations and theory.
(UT Twente, The Netherlands)
Experimental mechanics (incl. advanced full-field deformation measurements and parameter identification)
The mini-symposium focuses on the experimental mechanics including full-field deformation measurements and model parameter identification. The aim of the mini-symposium is to provide a forum to present and discuss the current trends within experimental mechanics.
While contributions in all aspects of experimental mechanics are invited, some of the topics to be featured are:
- In-situ mechanical characterization of materials and structures on various scales.
- 3D characterization.
- Digital image correlation.
- Micromechanical testing (microhardness, micropillar, microbending)
- Linking experimental methods and modelling.
- Model parameter identification and sensitivity analysis.
(Chalmers UT, Sweden)
(TU Eindhoven, The Netherlands)
The mechanics of highly porous materials: experiments and modelling
Highly porous materials, also termed "cellular materials" contain a solid part that can be made of metal, polymer, ceramic or eventually composites and a gaseous part with a very high volume fraction. This encompasses wools, foams, lattices, textiles, preforms, ... This class of materials is omnipresent in nature (trabecular bone, wood, cork, coral, etc...) and is now also spreading as engineering material in the industry and as a topic of increasingly multidisciplinary research in the mechanics of materials community. Highly porous materials have interesting physical properties (acoustic, thermal, ...), but before using them in structural applications, their mechanical properties have to be properly characterized and understood. In terms of mechanics, they are pressure sensitive, prone to size effects and can sometimes be better regarded as structures or systems rather than materials. The present symposium aims at gathering scientists interested in the mechanics of highly porous materials. Both experimental and theoretical/numerical approaches are welcome in the sessions.
(INSA Lyon, France)
(Rijksuniversiteit Groningen, The Netherlands)
Advanced modelling techniques: higher-order continua
Generalized continua are now extensively used to mdel and simulate size effects in the deformation and fracture of materials. Such approaches include strain gradient theories for elasticity, plasticity and damage, but also higher order media that introduce additional kinematic or physical degrees of freedom in addition to the usual displacement field. Cosserat and micromorphic approaches can be used to address a large variety of material behavior like foams, single and polycrystalline metals, composites, and soils and other civil engineering materials. Generalized material models can be identified from experimental data but also, increasingly, from micromechanical considerations based on extended homogenization theory. Various techniques are available like multiscale expansion methods or non homogeneous boundary conditions applied to representative volume elements. The session is open to any new advances in this field from the theoretical, computational and experimental perspectives.
Sessions are envisioned in the following areas, although the list is not exclusive:
Strain gradient plasticity theory and applications
- Cosserat and micromorphic approaches
- Gradient damage models
- Non local theory and applications
- Regularization methods for strain localization phenomena
- Mesh-independent finite element simulations of fracture
- Higher order approaches in geomechanics
- Homogenization theory and generalized continua
- Micromechanics of generalized continua
- Dislocations and generalized continua
Grain size effects in metal polycrystals
(HZ Geesthacht, Germany)
(Mines ParisTech, France)
Advanced modelling techniques: multi-scale and scale bridging
Multi-scale techniques and scale bridging play a key role in connecting the macroscopic behaviour of materials and structures at the engineering level directly to the material microstructure and microscopic deformation processes. Many different classes of scale bridging methods have been developed for this purpose. These generally involve multiple disciplines, e.g., engineering, computational mechanics, mathematics, physics, chemistry, and so on.
This session is intended as a forum for bringing together scientists from different disciplines working on multi-scale techniques and scale-bridging problems in mechanics of materials, including both spatial, as well as temporal scales.
The topics to be addressed in this session include (but are not limited to):
- homogenization-based methods, e.g. mathematical homogenization, computational homogenization etc.
- embedded domain methods, domain decomposition methods, global-local techniques
- heterogeneous multi-scale method (HMM), equation-free method
- (non-equilibrium) thermodynamics based coarse graining methods
- methods for bridging distinct models, e.g. atomistic-to-continuum, quasi-continuum
- methods for phenomena with (partially) non-separating scales, e.g. localization, damage and fracture or transient phenomena
- methods for coupled multi-field phenomena (e.g. thermo-chemo-electro-mechanical etc.)
- model reduction techniques and reduction of computational costs associated with multiscale algorithms and complex microstructures, e.g. arising from experimental imaging techniques
(TU Eindhoven, The Netherlands)
(MPIE Dusseldorf, Germany)
Advanced modelling techniques: Stochastics in materials mechanics
This session focuses on new theoretical, numerical and experimental approaches in the description of stochastic multi-scale microstructures and the prediction of their mechanical properties and behavior. In terms of microstructure description, the session covers in particular the topics of morphological analysis and segmentation of 3D microstructure images, stochastic models of disordered structures. Concerning the prediction of mechanical properties, the session covers all aspects related to stochastic homogenization in a broad way, including full-fields, finite element and Fourier-based numerical homogenization of random models and of real 3D microstructures, as well as analytical, numerical and experimental studies of scale-effects for random microstructures. Some applications include analytical and numerical probabilistic models for failure, fatigue and damage, and the morphological study of local fields. Finally, the session covers computational methods and algorithms for the simulation of heterogeneous and stochastic materials, including coupling schemes for stochastic multiscale simulations, methods for wave propagation in random media, and error estimation methods.
(Ecole Centrale Paris, France)
(Mines ParisTech, France)
Advanced modelling techniques: phase field approaches
Phase-field has over the years become the method of choice for simulating phase transformation microstructure evolution at the mesoscopic scale. It combines a strong basis in thermodynamics with numerical efficiency. Applications reach from solidification over solid state transformations including elasticity and plastic relaxation to piezo-electric and magnetic coupling and even shape optimization. The symposium shall review actual developments in this rapidly growing field with the special emphasis on coupling between phase-structure and mechanical load. Materials in focus are metals and ceramics; however applications to soft matter and polymers are welcome to explore synergetic approaches.
(TU Kaiserslautern, Germany)