iMechanica

Hi, all

Is there any guy try to do system-level simulation combining FEA and circuit analysis in any multi-physics softwares? I want to simulate the energy harvesting from piezoelectric material, through some diodes and into capacitor. Abaqus only can give voltage. Ansys has some electric elements but some non-linear element such as diode is not compatible with piezoelectric element. Any body know about whether COSMOL can do this simulation job? 

Thanks, 

I am doing an impact analysis in LS-Dyna . When I include failure strain data  I am not able to get the energy balance in GLSTAT . So I tracked it using MATSUM . But there is huge difference in the energy input and energy output. SO I ran the same without failurestrains. Here I got the energy balance. Can somebody let me know whether there is some issue in my postprocessing the results while using failure strain?

Within the

7th Research Framework Programme of the EU (FP7),
The project "Macro, Micro and Nano Aspects of Machining - MAMINA"
offers a three-year PhD project
named
"Finite Element Simulation of the Cutting Process"
at the Institut für Werkstoffe, Technische Universität Braunschweig.

I have implemented a 2D co-rotational truss formulation in matlab.  I get identical results to OpenSEES.

Now I'm trying to implement a 2D co-rotational beam formulation.  I have followed the simple formulation in Crisfield's book volume 1.  It seems like this should be a fairly straight forward extension of the truss formulation.  I have rederived everything Crisfield has done and obtained the same results, yet something is still incorrect.

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.

A recent paper on JMPS has seriously questioned the foundation of the SGP theory of Fleck and Hutchinson.  The matter is not simple, but is it a good bench test for imechanica to discuss?

doi:10.1016/j.jmps.2008.12.002    

This is topic 12-21 Advanced Computational Methods for Fracture in the upcoming ASME Congress 2009 (November 13-19, Lake Buena Vista, FL., USA.) Deadline for abstract submissio: March 2, 2009.

The aim of the topic is to recognize the recent development in the computational tools for fracture characterization. The topic is open to all contributions on numerical techniques, simulations of fracture problems at all length scales, failure mechanism modeling, fracture prediction, and computational algorithms to achieve these goals.

I taught this course at the University of California, Santa Barbara, in Winter 1994, Winter 1995, Spring 1996; at Princeton, Spring 2003; at Harvard, Spring 2004.  The notes posted here are those distributed to the class in Spring 2004.

 Topics

I am a freshman in micromechanics area. Many books and papers always say the linear elastic equilibrium equation(Someone also called Navier type function) could be solved with Green Function and Fourier Transformation, but without details. May be the writers think anyone should know these two popular methods in solving the PDE. I have search many books(both mathmatic and mechanics), However, there are little information about solving the navier type function with those two methods. 

An essential step to “understand” thermodynamics is to get to know temperature: how temperature comes down as an abstraction from empirical observations, and how it rises up as a consequence of the fundamental postulate.  I have just updated my notes on temperature.  The beginning paragraphs of the notes abstract temperature from empirical observations.  These paragraphs are posted here.

From Prof. John Nairn:

Dear Colleagues,

I am writing to see if we can arrange the Fifth MPM Workshop to be held
at Oregon State University (Corvallis, OR) April 2 & 3, 2009.
Please respond soon (since time is getting short) with following items:

1. Attendence
    a. I will plan on attending
    b. I will try to attend if possible
    c. I cannot make it
    d. I could make a different date (this date was from a mini poll)

Abstract submission deadline: March 2, 2009 

To submit your abstracts to this symposium, select "Track 12 Mechanics of Solids, Structures and Fluids"; then select "Topic 12-26 Mechanics of Thin Film and Multi-layer Materials". 

I want to reply to other people's comment , but when I finish the reply and clikc the "post comment" it always warns comment field is required , I Do not know what is wrong. If someone knows the problem, please tell me, thank you very much!!!

In the past few days at iMechanica, there have been quite a few messages dealing with different aspects of programming, libraries and so on...

It would perhaps be timely, therefore, to ask:

Do you have any opinion about using Java in numerical analysis (NA) / FEM / CFD etc.---i.e., in computational engineering and sciences (CES)?

Do you have any experience or hard data concerning performance of Java vis-a-vis C++ or FORTRAN, esp. for large systems, or for high-performance applications? Any pointers?

Hello all,

I am studying some simple finite elements for 2d near-incompressible analysis. Particularly, I am interested in the MINI element. It is basically a 3-node triangle element with nodal pressure and displacement degree of freedoms enriched by a bubble function. Could someone that has some experience with these elements point me out about advantages and drawbacks of using these type of elements?

Thanks,

Alejandro.

I am a freshman of researching the macro response of  metals with micromechanics scheme. Now,I have to build a  self-consistent modeling of plastic and viscoplastic for polycrystalline materials. However, it seems difficult for me as I have little knowledge of polycrystalline and its mechanics propertities.

If you know some systematic books or papers about my research area. please let me know. Your kindness will be great appreciated!!!

I am doing plain concrete beam subjected to low velocity impact model in abaqus. for model the concrete i have choosen concrete damaged plasticity. Is it the proper selection for model the concrete under dynamic loading. If it is correct, how to get the tensile behaviour of concrete (yiled stress, cracking starin) from uniaxial test data (yiled stress, inelastic strain). Please help me if any body is having the idea on this.