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Rotations with constant Curl are constant

Submitted by Amit Acharya on

Janusz Ginster        Amit Acharya

to appear Archive for Rational Mechanics and Analysis

We address a problem that extends a fundamental classical result of
continuum mechanics from the time of its inception, as well as answers a fundamental
question in the recent, modern nonlinear elastic theory of dislocations.
Interestingly, the implication of our result in the latter case is qualitatively di fferent
from its well-established analog in the linear elastic theory of dislocations.

Preprint

3D Printed Silicone Polymer : Thermo-viscoelastic experimental characterization and computational modelling

Submitted by mokarram76 on
research
metamaterials; additve manufacturing; 3D printing; Multifunctional materials; Cellular composites; Architected materials

A comprehensive thermo-mechanical experimental study and subsequent constitutive modelling will facilitate in designing and simulating more complex cellular metamaterials using 3D printed silicones

Dynamics of Electrohydraulic Soft Actuators

Submitted by Philipp Rothemund on

We have discovered two timescales that govern the dynamic behavior of electrohydraulic actuators: a viscous timescale and an inertial timescale, which depend on geometry and materials system of the actuator, and applied mechanical load and voltage. Depending on the ratio of these timescales, the actuators operate either in a viscous regime in which viscous resistance limits the actuation speed or in an inertial regime in which high speed actuation is possible.

USACM Virtual Seminar by Pania Newell, University of Utah

Submitted by John E. Dolbow on
research
seminar
fracture
computational mechanics

The USACM is happy to announce a virtual seminar this week on Wednesday, July 1st at 3pm Eastern.  The title of the seminar is "Examining Fracture Behavior in Heterogeneous Poro-Elastic Media from Nano to Macro-Scale".  An abstract of the talk is available here:

https://unsacm.memberclicks.net/assets/docs/Newell_2020.07.01_2pm.pdf

We have a number of seats available to anyone interested.  We just ask attendees to register at this page:

Elasticity notes of Eli Sternberg

Submitted by Ruobing Bai on

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.

 

keep reading-4

Submitted by Bin Wang on
research

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:

Variable kinematics continuum finite element

Submitted by Mayank Patni on
research
Variable fidelity finite element; Unified Formulation; 3D stress fields; Laminated composites;

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). 

https://github.com/mayankpatni/TaylorExpansionsBasedUF.git

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