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kinematic vs Isotropic hardening

Submitted by Vijay Kumar Sutrakar on
Forums
Computational Mechanics Forum

Hi

Isotropic hardening means, sigma_yield ll be same under both the tension (sigma_tension_yield) and compression loading(sigma_comp_yield). and the total sigma_y=sigma_tensio_yield+sigma_comp_yield.

In the case of isotropic hardening, If you increase the tensile yield strength by some means, at the same time your compressive stress ll also get increased. Hence, you get a increased radius of the yield surface. with the same shape with increased size of yield surface. and your total sigma_y ll no more remain constant. It ll get increased.

Some questions about wave propagation

Submitted by LG on
research
shock waves
linear wave equation
ultrasound

Dear Sir，

As we know, periodic signals are best analysed in the frequency domain while stochastic signals are usually more profitably analysed in the time domain. The analysis in the frequency domain usually concern only one signal while in the time domain often involves the comparison of several different signals.

1) what are the general methods for transforming the frequency domain into time domain, and which should be superior?

Isotropic hardening and kinematic hardening

Submitted by kajalschopra on
Forums
Computational Mechanics Forum

I've been trying to figure out difference between isotropic and kinematic hardening.

As I see,kinematic hardening can model reversible nbehaviour of metals (Bauschinger effect).

In isotropic hardening, the yield surface increase in size, but remain the same shape, as a result of plastic straining.

That is, if the yield surface is represented by a cylinder of radius "A" then an increase in the radius denotes an increase in the yield stress as a result of plastic straining.

A Problem in Nature Of XFEM Approximation

Submitted by S. Omid R. Biabanaki on
research
xfem
gfem
approximation

There is a basic problem in NATURE of approximation of discontinuity in element using XFEM.I tried to illustrate that below:

for example, If you consider an element with strong discontinuity( like fracture or contact) which usually we use heaviside function as enrichment function. we expect two parts of element deform independently because of nature of problem.



In equation for approximation of this element we have two main parts. First  is 'regular' or 'standard' part which uses the standard shape functions of element and Second is the enriched part.

Faculty Position in Materials Science and Engineering at the University of Pennsylvania

Submitted by Dan Gianola on
job
Faculty Position
materials science

The Department of Materials Science and Engineering at the University
of Pennsylvania invites applications for a tenure track faculty
position. Applications will be considered from outstanding candidates
in any emerging area of Materials Science and Engineering. Successful
candidates will be committed to excellence in undergraduate and
graduate teaching, in particular curriculum development related to

Mechanics connection to memory

Submitted by Taher A Saif on
research

Mechanical tension contributes to clustering of neurotransmitter vesicles at presynaptic terminals. 

Scott Siechen, Shengyuan Yang, Akira Chiba and Taher Saif

Proceedings of the National Academy of Sciences,   August 4, 2009   vol. 106   no. 31   12611–12616 

http://www.pnas.org/gca?gca=pnas%3B106%2F31%2F12611&allch= 

 

The Meaning of the Concept of Potential in Mechanics (and in Physics)

Submitted by Ajit R. Jadhav on
stress
energy
Potential
Potential Function
Field Theory
Force
Calculus of Variations
Energy Methods
Kinetic

If someone knows of books/articles dealing with the meaning of the concept of potential in physics (or concerning the physical bases underlying the energy methods of mechanics) then I would very much appreciate getting to know about these.

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