Here are the elasticity notes of Eli Sternberg over many years as he taught AM 135 at Caltech. I had access to them when I was working with Prof. Kaushik Bhattacharya at Caltech during postdoc. Prof. Bhattacharya suggested making the notes publicly available via iMechanica, and below is a short note from him.
Layered nanocomposites by shear-flow-induced alignment of nanosheets, Chuangqi Zhao, Lei Jiang, Mingjie Liu, Nature, 2020
Novelty/impact/significance:
A generalizable and scalable, continuous fabrication of ultrastrong composite films (with nanosheets of graphene oxide and clay, strength 1215 MPa modulus 198.8 GPa,, and ultrastrong and ultratough composites (with nanosheets of clay, toughness 36.7 MJ/m2 strength 1195 MPa) based on a superspreading layering strategy.
Scientific question:
Willing to share the work done in my Ph.D. thesis ("An efficient numerical framework for capturing localised 3D stress fields in laminated composites). The basic code (written in FORTRAN 90) is available on GITHUB (Check the following link).
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Wire Arc Additive Manufacturing or WAAM techniques are attracting interest from the manufacturing industry because of their potential to produce large metal components with low cost and short production lead time. This process exists alongside other high deposition rate metal AM technologies such as powder and wire based DED. While these use either laser or an electron beam as energy source to melt a metal powder or wire, WAAM technologies melt metal wire using an electric arc.
EML Webinar on July 1, 2020 will be given by Prof. Chiara Daraio at Caltech via Zoom meeting. Discussion leader: Teng Li, University of Maryland.
Title: The mechanics of Robotic Matter
Time: 7 am California, 10 am Boston, 3 pm London, 10 pm Beijing on July 1, 2020
Zoom Link: https://harvard.zoom.us/j/271079684
A formal hierarchy of exact evolution equations are derived for physically relevant space-time averages of state functions of microscopic dislocation dynamics. While such hierarchies are undoubtedly of some value, a primary goal here is to expose the intractable complexity of such systems of nonlinear partial differential equations that, furthermore, remain ‘non-closed,’ and therefore subject to phenomenological assumptions to be useful. It is instead suggested that such hierarchies be terminated at the earliest stage possible and effort be expended to derive closure relations for the ‘non-closed’ terms that arise from the formal averaging by taking into account the full-stress-coupled microscopic dislocation dynamics (as done in [CPZ+ 20]), a matter on which these formal hierarchies, whether of kinetic theory type or as pursued here, are silent.
An immediate Ph.D. position is available in the Predictive Computational Engineering (PCE) Lab in the Department of Mechanical and Aerospace Engineering. The research project aims at developing novel computational methods for predictive modeling and uncertainty quantification of biomimetic-inspired materials systems. Candidate should already be in the U.S. and must have a Master's degree in engineering or applied math. A strong background in computational and applied mechanics is desired. If interested, contact Dr.
