Industry/Government Led Panel Discussions

There will be approximately 35 seminar style presentations. In addition there will be 3 panel discussions on relevant topics that will be led by members from industry and government laboratories. These are mentioned below.

Panel 1: Linking Microstructure to Performance across Fatigue Loading Regimes in Single and Polycrystal Metal Alloys

This session will address key microstructural features including grains, boundaries, interfaces, twins, crystallography, micro-texture, phase, and triple junctions in polycrystal slip and twinning (all where appropriate) in metals, over regimes of fatigue including classically described low, high and very high cycle loading, with particular focus on addressing mechanistic understanding and identification of the appropriate length scale at which to seek understanding. Wherever possible, the intention will be to address links between mechanistic understanding and key in-service performance measures in terms of, e.g., structural integrity strength, endurance, and fatigue life. The aim of the discussion is to attempt to construct guidelines to define the fundamental research needed to address key safety critical, high-value, industrial performance needs.

Panel 2: Response of Materials to Dynamic Mechanical Loading and Their Physical Representation

Consistent with the overall goals of the IUTAM meeting, the response of materials to extreme loading conditions, especially when damage and failure events occur remains a significant challenge to capture experimentally and successfully describe computationally. Many physical processes (i.e plasticity, porosity, shear banding, cleavage and delamination) involved in extreme loading of materials entail statistical distributions of properties and rare events for which our mean-value state variable theories require further development. This necessarily entails direct linkages to microstructural details of the material in question – whether metallic, ceramic, or composite. New numerical techniques must also be envisioned to enable successful representation of these discrete events which expand in size. In addition to the uncertainty in the experiment/model coupling, many conditions for which we must develop   models   are   not   approachable   experimentally   and   therefore   quantifying uncertainty in extrapolation of model use beyond experience is critical. Within the international community, new experimental capabilities are being developed or planned which will allow for in-situ probing of physical response taking place at small length and time scales. Close collaboration between the experimental, modeling, and simulation communities will be critical to allow for extracting of physical insights from these new types of results. The goal of this discussion is to attempt to construct guidelines to define the fundamental research needed to address key defense and industrial needs.

Panel 3: Radiation and High Temperature Environment Materials – Modeling and Design of Advanced Material Systems

Materials for use in radiation and high temperature environments, which may also involve high levels of mechanical loading, are in most cases designed specifically for these types of conditions. In these cases, the coupling of modeling, simulation, and experimental results is particularly important to facilitate greater performance advancement. For these applications, mechanisms of deformation and damage with service time exposed to these conditions are also sensitive to the structure of the material and in some cases performance enhancement relies on the control of the structure or different combinations of materials. For these extreme environment conditions, mechanisms of deformation and damage are critically important to identify in order that these particular mechanisms can be controlled to delay or avoid material failure. In addition, experiments can be very difficult and sometimes impossible, then only computations are available. The computations involve much effort and further work is necessary to define multiscale and multiphysics modeling at the very small scale as well as computational techniques. Lifetime prediction is also particularly important for these applications since the cost of failure can be very high and so discussions of the coupling of modeling and experimentation to uncertainty reduction will also be sought.  In addition, we will attempt to define further work needed to advance our understanding of critical behavioral mechanisms for these materials