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Is Thermoelectric Conversion Efficiency of a Composite Bounded by its Constituents?

Submitted by jiangyuli on
research
thermoelectric composite

We analyze the conversion efficiency of thermoelectric composites, and conclude that thermoelectric figure of merit ZT as we know it is ill-defined for composites, and is irrelevant for their conversion efficiency. In addition, we prove that thermoelectric conversion efficiency of a composite is not bounded by its constituents, and can be higher than all its constituents in the absence of size and interface effects, in contrast to previous claim.

Symmetry-Adapted Phonon Analysis of Nanotubes

Submitted by Amin Aghaei on
research
Nanotubes
phonon
Objective structures
Stability of Crystals
Dispersion Curves

This is the draft of our recent paper on the phonon analysis of nanotubes which is accpeted for publication by JMPS. The title and abstract are:

Title: Symmetry-Adapted Phonon Analysis of Nanotubes

Amin Aghaei, Kaushik Dayal (Civil and Environmental Engineering, Carnegie Mellon University)

Ryan Elliott (Aerospace Engineering and Mechanics, University of Minnesota)

 

Abstract:

Bad material definition: vumat

Submitted by brunda on

Hi,



I am simulating a sphere inclusion in a cube. The cube and the
spherical inclusion have different material properties and their
constitutive behavior follows the same equations.  I use vumat to
describe the constitutive behavior. The material properties
and the vumat have been tested individually and they work fine.



When, I use two different sets of material properties simultaneously in simulation, I get the following error



***ERROR: Bad Material definition in element number 136 instance

Faculty Position in Engineering Science & Mechanics at Virginia Tech

Submitted by Douglas P Holmes on
job
Faculty Position
dynamics
mechanics
assistant professor
associate professor
full professor

The Department of Engineering Science and Mechanics (ESM) at Virginia Tech seeks applicants for a tenure-track or tenured faculty position in the general area of dynamical systems with applications to mechanics. Appointment will be at the rank of assistant, associate or full professor. Exceptionally qualified candidates may also be eligible for a named professor appointment.

Postdoctoral Positions at National University of Singapore

Submitted by Jian ZHU on
job

Two postdoctoral positions are
available in the area of applied mechanics/mechanical design at the National
University of Singapore, Singapore.  Experiment
experience is a plus. One may focus on energy harvesting using soft active
materials, while the other may focus on soft robots.

A Post-Doctoral position at the Hebrew University- mechanics of landslide triggering.

Submitted by einatah on
job
landslides

A postdoctoral research position is
available at the Earth Sciences Institute, at the Hebrew University,
Jerusalem, Israel, focusing on understanding basic processes of
submarine landslide triggering, with applications to the Eastern
Mediterranean Sea, offshore Israel. The work will involve numerical
and/or physical modeling, analyzing the mechanisms of submarine
slope-failure. Applicants should send their CV and intention letter
including names of 3 referees, directly to the PIs: Prof. Einat Aharonov

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