A microscopic continuum model for defect dynamics in metallic glasses
Amit Acharya Michael Widom
To appear in Journal of the Mechanics and Physics of Solids
Motivated by results of the topological theory of glasses accounting for geometric frustration,
we develop the simplest possible continuum mechanical model of defect dynamics in metallic
glasses that accounts for topological, energetic, and kinetic ideas. A geometrical description
of ingredients of the structure of metallic glasses using the concept of local order based on
Frank-Kasper phases and the notion of disclinations as topological defects in these structures is
proposed. This novel kinematics is incorporated in a continuum mechanical framework capable
of describing the interactions of disclinations and also of dislocations (interpreted as pairs of
opposite disclinations). The model is aimed towards the development of a microscopic understanding
of the plasticity of such materials. We discuss the expected predictive capabilities of
the model vis-a-vis some observed physical behaviors of metallic glasses.
[Call for abstracts] 3D Printed Soft Materials, ASME IMECE 2016
Dear Colleagues,
Please be reminded that this year IMECE runs with two abstract submission deadlines.
2017 ASME Congress invitation-Dynamic failure of advanced materials
Dr. Jun Xu and I organize one topic on “Dynamic failure of advanced materials (fatigue failure is included also)” for 2017 ASME Congress. Our keynote speakers include a senior program manager of US Office of Naval Research and a distinguished researcher of US Army Research Laboratory. We would invite you (also your colleagues and group members) to submit a short abstract before ASME’s deadline March 6. More details below:
ASME Conference: Constitutive Modeling of Biological Tissues
Dear Colleagues,
On behalf of the ASME Mechanics for Biology and Medicine Technical Committee and Constitutive Equations Technical Committee, I cordially invite you to submit an abstract to the following track:
12-9 Constitutive Modeling of Biological Tissues
The ASME/IMECE 2016 will be held from November 11 to November 17, 2016 in Phoenix, AZ (https://www.asme.org/events/imece)
Abstract submission deadline: March 07, 2016
Strain-induced programmable half-metal and spin-gapless semiconductor in an edge-doped boron nitride nanoribbon
Shuze Zhu* and Teng Li*, Strain-induced programmable half-metal and spin-gapless semiconductor in an edge-doped boron nitride nanoribbon, Physical Review B, 93, 115401 (2016)
Simpleware Boston Seminars: Wednesday Mar 16 2016
Introduction and Live Demo
3D Image Visualization, Analysis and Model Generation with Simpleware
Date: Wednesday, March 16, 2016
Time / Venue: 10:30am - 12:00pm: Boston Marriott Cambridge, 50 Broadway, Cambridge, MA 02142
Time / Venue: 2:00pm - 3:30pm: Regus Newton, Riverside Center, 275 Grove St #2, Newton, MA 02466
Who should attend
Mechanisms of fatigue crack growth – a critical digest of theoretical developments
Improtance of modeling fatigue damage propagation is substantial given the ubiquity of fatigue-induced component failures across industries. A review of fatigue crack growth models along with a detailed discussion of recent experimental findings (substantiating the model assumptions) are presented (please see the pdf attachment below)
Recent advances in modeling fatigue cracks at microscale in the presence of high density coherent twin interfaces
Various outcomes of slip-coherent twin boundary depending on the stress state and slip geometry (during the growth of a microstructurally short crack)