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thermodynamics

Guanchu Cheng's picture

thermodynamics equilibrium state vs. steady state???

I am not clear about two concepts: thermodynamics equilibrium state and steady state. It's easy to conceive of the following different two osmosis processes regarding thermodynamics equilibrium state and steady state, respecitvely.

Zhigang Suo's picture

Freely jointed chain

A single strand of polymer is a chain of a large number of monomers.  The monomers are joined by covalent bonds, and two bonded monomers may rotate relative to each other.  At a finite temperature, the polymer rapidly changes from one configuration to another.  When the two ends of the polymer are pulled by a force, the distance between the two ends changes.  The polymer is known as an entropic spring.  These notes are developed as part of statistical thermodynamics to supplement the course on advanced elasticity

Physical Foundations of Continuum Mechanics

After many publications and lecture notes, Prof. Ian Murdoch has finally organized much of that material in the form of a book.

I am very hopeful that like Prof. Murdoch's lectures, this monograph will also help the readers to develop a better understanding of the physical aspects of mechanics. It will be a valuable addition to the researchers' personal collection. 

Link:

Zhigang Suo's picture

Empirical observations of temperature

I have divided the old notes on temperature into three parts:

Our feeling of hotness comes from everyday experiences. These experiences indicate that many levels of hotness exist, and that all levels of hotness can be mapped to a real variable.

Andrew Bunger's picture

Postdoctoral Fellow - Geomechanical Modelling, Perth, Australia

CSIRO division of Earth Science and Resource Engineering is seeking a Postdoctoral Fellow to develop a coupled Thermo-Hydro-Chemo-Mechanical (THCM) reservoir model for application to Engineered Geothermal Systems. To read the position details and to apply please visit this link: http://csiro.nga.net.au/?jobID=2aac9739-a118-8730-e510-64c65b15c683&audienceTypeCode=INT&appJobAd=1

 

Zhigang Suo's picture

Temperature vs. chemical potential

For the third time I am teaching the graduate course on soft active materials.  This course is called Advanced Elasticity in the Catalog of Courses.  In the last several years, I have dropped several traditional topics, and focused on thermodynamics and finite deformation.  I have added several topics where both thermodynamics and finite deformation play significant roles, such as elastomeric gels and dielectric elastomers.

Zhigang Suo's picture

Teaching Engineering Thermodynamics to Undergraduate Students

I have just volunteered to teach engineering thermodynamics to undergraduates in the Fall semester of 2011.  The students will be from all fields of engineering, primarily mechanical engineering, environmental engineering, and bioengineering.  I have never taught this course before, and would love to hear from you about your experience, either as a student or as a teacher. 

Here is what I have found from the website about the course.

Engineering Science 181 Engineering Thermodynamics

Amit Acharya's picture

Microcanonical Entropy and Mesoscale Dislocation Mechanics and Plasticity

(Journal of Elasticity, Carlson memorial Volume)

A methodology is devised to utilize the statistical mechanical entropy of an isolated, constrained atomistic system to define the dissipative driving-force and energetic fields in continuum thermomechanics. A thermodynamic model of dislocation mechanics is discussed. One outcome is a definition for the mesoscale back-stress tensor and the symmetric, polar dislocation density-dependent, Cauchy stress tensor from atomistic ingredients.

Hanqing Jiang's picture

A Thermodynamic Model of Physical Gels

Physical gels are characterized by dynamic cross-linksthat are constantly created and broken, changing its state between solid andliquid under influence of environmental factors.

Bo Li's picture

How is the entropy of polarization in dielectric material

In the study of thermoelastic actuation of dielectric elastomer, we can write the Helmholtz free-energy as a function of stretch ratio, nominal electric displacement and temperature (T).

The entropy (S) is the negative partial differential coefficient of W with respect of temperature (T). And we can see the change of S is due to three components: deformation, heat conduction and polarization. In an isothermal state, the deformation part has been fully investigated by Arruda and Boyce in 1993, but the polarization-induced entropy (Sp) has not been clearly stated.

Ajit R. Jadhav's picture

Food for Thought: A Few Recent arXiv Papers

Since my research touches on the basics of QM, I have developed this habit of visiting arXiv.org every now and then. Last week or so, at arXiv.org, I found a couple of interesting articles on physics in general. I would like to share these with you.

Adrien Haxaire's picture

Looking for a Post-Doc position in Geomechanics, in Europe

Dear all,

My name is Adrien Haxaire. I am currently Associate Professor at LGCIE, INSA Lyon, France, until end of August. I am looking for a
Post-Doc position in geomechanics in Europe.

During my PhD, I developped a thermodynamical model capable of describing coupled THMC phenomena in unsaturated porous media. It was implemented in Cast3M. 

I am very interested in chemical reactions in porous media, their modelling and implementation. I am also interested in the field of CO2 sequestration.

Robert C. Cammarata's picture

New papers on thermodynamics and mechanics of surfaces

Please allow me to note that I have recently published in Philosophical Magazine a paper that presents a general approach to Gibbsian surface thermodynamics that includes a treatment of solid surfaces.  It can be accessed through the following link: 

http://www.informaworld.com/smpp/content~db=all~content=a792987191

WaiChing Sun's picture

potential functional for material exhibts non-associative elastoplastic response

Does anyone knows where I can find any paper discuss the existence of potential functinoal for materials that violate the maximum plastic dissipation principle (due to non-convex yield function and/or non-associately fluw rule)?

Zhigang Suo's picture

Learning temperature, pressure, and chemical potential

I have updated sections of my notes on thermodynamics.  A few thoughts on learning are collected here.  Of our world the following facts are known:

Zhigang Suo's picture

Free Energy

For a system in thermal contact with the rest of the world, we have described three quantities: entropy, energy, and temperature. We have also described the idea of a constraint internal to the system, and associated this constraint to an internal variable.

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