Nanomechanical Materials Behavior Committee

Technical Programming

2018 TMS Annual Meeting & Exhibition: Fracture: 65 Years after the Weibull Distribution and the Williams Singularity: Organized by Brad Boyce; Ellen Cerreta; Jacob Hochhalter; Jonathan Zimmerman

In 1951, Waloddi Weibull published a single-author paper describing a new statistical distribution “of wide applicability” in the Journal of Applied Mechanics. The very next year in the same journal, Max Williams published a single-author paper describing an analytic stress singularity that has become the foundation of linear elastic fracture mechanics. The Weibull distribution provides a stress-based method for assessing the statistics of failure whereas the Williams singularity provides a deterministic description of the stress field at a crack tip that drives fracture. While the two approaches are quite different, they both continue to be profoundly useful for engineering design. The symposium will focus on application of these methods to materials science, the limitations of these methods and nuance that has been unearthed after 65 years of use. How have these methods assisted in the development of improved engineering materials and more reliable engineered structures? What recent analysis methods for material failure might have a similar impact 65 years from now? Why is recent research not as readily adopted by broad engineering practice? What are the current generational challenges in fracture and material failure?

2018 TMS Annual Meeting & Exhibition: Mechanical Behavior at the Nanoscale IV: Organized by Christopher Weinberger; Qian Yu; Garritt Tucker; Nan Li; Yu Zou; Jonathan Zimmerman; Scott Mao

Understanding the mechanics of materials in small volumes is of fundamental importance because it simultaneously allows for the exploration of new properties at the smallest of length scales as well as provides a basis for understanding multiscale phenomena that originate at these lengthscales. This symposium will focus on the mechanical properties of small-volume and low-dimensional materials, as well as bulk materials that are comprised of or are aggregates of these materials including bulk nanostructured materials and nanoscale based heirarchical materials. Of particular interest are studies that discuss sample size effects, applications of nanoscale mechanical testing and the associated characterization, as well as modeling that addresses the mechanical properties of these materials. Properties of interest include, but are not limited to: elasticity, strength, plastic flow, fatigue, and fracture with material systems ranging from hard materials, including metals and ceramics, to soft and biological materials. Topics will include: - Size effects on elasticity, strength, plastic flow, fracture and fatigue in low dimensional materials including nanopillars, nanowires, nanoparticles, thin films, multilayered materials, graded materials, and architecture-designed materials. - Changes in deformation types or patterns due to changes in scale including those due to size affected phase transformations, changes in density and types of interfaces, as well as available deformation sources. - Ex-situ and in-situ (SEM, TEM, XRD, neutron, etc.) mechanical characterization methods. - Modeling and simulation at all scales, as well as coupled scale modeling, of mechanical behavior of nanostructured materials - Confinement and size effects in glasses and disordered media. - Small scale mechanics of soft matter: polymers, and biomaterials (e.g collagen, chitin, and keratin, as well as other organic materials).

2018 TMS Annual Meeting & Exhibition: Ultrafine-grained Materials X: Organized by Suveen Mathaudhu; Irene Beyerlein; Avinash Dongare; Chong Soo Lee; Terry Lowe; Srikanth Patala; Lee Semiatin; Jason Trelewicz; Janelle Wharry; Caizhi Zhou

This is the tenth international symposium that focuses on all aspects of the science and technology of ultrafine grained (UFG) and nanocrystalline materials. This symposium covers a broad scope, ranging from fundamental science to applications of bulk ultrafine-grained (grain size <1000 nm) and nanostructured (feature size <100 nm) materials. It provides a forum on the topics of fabrication and understanding of UFG and nanocrystalline materials including conventional and emerging technologies and advancements, fundamental issues in severe plastic deformation (SPD) processing and SPD-processed materials, UFG and nanocrystalline microstructure evolution, mechanical and physical properties, deformation mechanisms, superplasticity, joining and bonding, computational and analytical modeling, structural and functional applications, etc. Other emerging topics to be covered include gradient and layered nanostructures, vapor-phase processing, powder processing, rapid-solidification methods, bio-inspired nanomaterials, and radiation tolerant nanomaterials. Also, in honor of the 10th iteration of this symposium, we will hold a “Pioneers of Ultrafine Grained Materials” session that will highlight the contributions of the superheroes of this field. Awards: UFG X will be hosting a Young Scientist Session for students or post-docs within three years of receiving their Ph.D. There will be up to two Gold Medals and three Silver Medals for best oral presentation. Awards will also be given for best poster (One Gold Medal and two Silver Medals). A committee that includes the symposium organizers and invited speakers will decide the awards. Each medalist will receive a certificate, and may receive a cash prize, depending on resources available.