Symposia

Prof. El-Awady is involved in the organization of the following mini-symposia. Further details can be obtained by following the links attached or by contacting Prof. El-Awady directly.

Mini-symposium: Dislocation Plasticity
Conference Dates: December 1 – 6, 2013

The mechanical behavior of crystalline materials is largely determined by dislocations and their interactions among themselves and with other crystal defects. The complexity of these interactions and the variety of collective effects emerging from them keep dislocation mechanics one of the most active fields of research in the mechanics of materials. Recent progress in experimental characterization, together with improved simulation methods and theoretical advances on various scales, established new fields of research, like small scale plasticity, and stimulated the reconsideration of open questions in dislocation mechanics, such as dislocation patterning and work hardening. The Dislocation plasticity symposium brings together a broad range of materials scientists for a technical exchange and a discussion of the challenging issues driving research in this field. The topics of interest to this symposium include, but are not limited to, the following:

  • Structure and energy of dislocations
  • Atomistic simulations of dislocation and dislocation—defect interactions
  • Dislocation dynamics simulations
  • Dislocation—interface interactions
  • Dislocation evolution under mechanical deformation
  • Dislocation controlled damage and fracture
  • Experimental characterization of dislocations
  • Experimental characterization of plasticity
  • Statistical properties of dislocations
  • Nonlinear dynamics of dislocations and pattern formation
  • Continuum modeling of dislocations and plasticity
  • Novel experimental and theoretical techniques for defect and microstructure characterization

Organizers:
Thomas Hochrainer
Jaafar El-Awady
Giacomo Po
Stefan Sandfeld

Mini-symposium: Dislocation-Based Plasticity: Experiments, Theory, and Modeling
Conference Dates: January 3 – 8, 2013

Despite decades of research, a predictive multiscale constitutive model of plastic deformation remains elusive. Traditional plasticity experiments treat a deforming system as a black box in that the experiments characterize the average response of a system but say nothing about the state of the material in the system. In recent years, several new experimental methods have been developed in which crystalline defects predominantly dislocations are characterized either from a discrete perspective via TEM or from a continuum perspective via SEM. Thus, such experiments characterize the state of the material and are often multiscale in nature. Concurrent with the experimental advances are significant computational advances at all length scales of interest as well as methods to link these length scales computationally. This concurrence opens the opportunity for the first time to develop joint experimental and computational studies in which the state of the material predicted by computational methods can be compared directly over many length scales to the state of the material measured experimentally. The purpose of this minisymposium is to bring together researchers with a broad array of backgrounds to pursue this opportunity.

Organizers:
Jeffrey W. Kysar
Jaafar El-Awady
Nasr Ghoniem
Giacomo Po

Mini-symposium: Plasticity Bridging the Scales from Micro to Macro
Conference Dates: September 24 – 26, 2012

With emerging needs of developing lightweight structures, conventional metals are being re-engineered to make them stiffer, stronger and more ductile. Unfortunately, it may not be possible to improve all of these attributes simultaneously. In fact, many times an improvement in one is usually at the cost of some of the other properties. For example, while it is common to observe impressive improvements in strength in metals by refining the grain size to the limit of amorphization, it usually comes at the cost of severe reduction in the ductility. Novel experimental techniques such as in-situ TEM imaging, micro-scale testing, etc., have enabled understanding of the size-dependent physics and mechanics of plasticity at the fundamental length-scales. However, a critical evaluation of complicating aspects of plasticity becomes possible only through high-fidelity computational simulations. This is so because in experiments it is not easy to isolate the synergies between the unit processes (e.g. dislocations interactions) that contribute to the overall deformation. A broad aim of this minisymposium is to bring together researchers from the engineering and physical sciences to create a forum that will discuss modern insights into the physics and mechanics of plasticity at multiple length- and time-scales. The topics of interest include atomistics and discrete dislocation dynamics of interacting effects between dislocations and other defects, hierarchical material systems, (e.g. nanotwinned metals, nanocomposites), and bridging the scales. Of particular interest are studies that synchronize between experimental multi-scale characterization and mechanism-based multi-scale models for plasticity at fundamental length-scales.

Organizers:
Shailendra Joshi
Jaafar El-Awady
Amit Acharya

Mini-symposium: Multiscale Methods in Plasticity
Conference Dates: December 5 – 11, 2012

Plastic deformation involves important phenomena across multiple length scales. Physics-based modeling of material plasticity requires the understanding of those phenomena at every single scale as well as linking scales in order to pass fundamental deformation mechanisms from the atomistic to the macroscale. This minisymposium invites presentations on recent research related to multiscale methods in plasticity, including but not limited to Ab-initio, molecular dynamics, dislocation dynamics, crystal plasticity, computational continuum plasticity, and coupling between these methods.

Organizers:
Zhiqiang Wang
Jaafar El-Awady
Akiyuki Takahashi
Alfonso Nagan
Nasr Ghoniem

Mini-symposium: Microscale Deformation and Damage Mechanisms
Conference Dates: January 3 – 8, 2012

The micromechanics of defects and microstructure evolution ultimately govern the response and properties of materials. This mini-symposium will focus on recent progress in understanding the fundamentals of deformation and damage in solids. Recent experimental, theoretical and modeling efforts to understand and identify fundamentals of deformation and damage mechanisms at the micro-scale are of interest.

Organizers:
Jaafar El-Awady
Aman Haque

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