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Theoretical investigation on polar dielectric with large electrocaloric effect as cooling devices

Submitted by Bo Li on
research

Polar dielectric based cooling devices are
modeled as a system with two degrees of freedom and represented by either an
entropy-temperature or electric displacement-electric field plane. A typical
thermodynamic energy cyclic path is proposed for polar dielectric as cooling
devices to experience. With the influence of temperature taken into
consideration, the free energy of a thermal electrical coupling system of polar
dielectrics is formulated, and the variation of temperature and entropy, the
absorption of heat, and the work under different electric fields are calculated
for BaTiO3, Pb(ZrxTi1-x)O3, P(VDF-TrFE), and water. And the simulation results
obtained agree well with the recently published experimental data [B. Neese, et

PhD Positions Available in Mechanics of Materials at Clarkson University

Submitted by Lifeng Wang on
research
Two PhD positions are available immediately in the Department of Civil & Environmental Engineering at Clarkson University, NY, US.  The research program focuses on the mechanical behaviors of advanced materials including polymer microstructures, composites, nanomaterials, and biological materials. Interdisciplinary collaborations are possible. The candidates with background and interest in engineering mechanics, solid mechanics, and materials science are highly encouraged to apply.

(long distance) research cooperation..

Submitted by yp on
research
fracture mechanics
coating
computational materials science

let me know if you are interested in long distance research cooperation.

can be as simple as you get my explaination if you want/need to cite my works, or co-authoring paper in things that we can work synergically, or even research collaboration.

the only thing that i will not respond is if you ask for job....:) cant give you that.

 here is some of my recent works:

 computational materials science, 50(4) 2011 pp.1499-1503

 theoretical and applied fracture mechanic, in press, doi:

10.1016/j.tafmec.2011.10.004

Journal Club Theme of November 2011: Hierarchical Mechanics of Diatom Algae: From Atoms to Organism and Weakness to Strength

Submitted by Leon Dimas on
research
hierarchical materials

Hierarchical Mechanics of Diatom Algae: From Atoms to Organism and Weakness to Strength

This month’s iMechanica Journal Club theme is the hierarchical structure and mechanics of diatom algae, silicified organisms that use silica (“sand”) – abundantly available in the ocean – to construct strong, tough and stiff structures [1-10]. The interest in this area has been revived recently given recent advances in the combined measurement, modeling and synthesis of these materials, leading to exciting research being conducted at the interface of mechanics and biology.

Dynamic FEM: Can the timestep size be made extremely/arbitrarily small?

Submitted by Jayadeep U. B. on
research

Dear all,

I am in the process of developing an FE code, and doing the analysis, for a class of highly nonlinear, dynamic problems in elasticity using Total Lagrangian formulation.  It is well-known that for the accuracy purposes, we need to use a small timestep size (stability is not an issue for me as I am using an unconditionally stable implicit scheme for timestepping).

My doubt is whether I can use arbitrarily/extremely small time steps in the analysis for a given mesh?

Analytical solution of anisotropic crack or wedges

Submitted by Xiaofei Hu on
research
Irwin's solution; anisotropic; crack

Hi everyone,

      We know that crack or wedge problems are discussed in the porlar coordinate system which centered at the crack tip. Analytical solution (Irwin's) in an expanding form with unkown constants exist for crack or wedges with any open angle in isoptropic materials. The analytical solutions are always employed as enrichments in FEM, MM, XFEM. When the problem moves to anisotropic materials, does the analytcial solution exist?

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