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The essential assumption of Cauchy Stress

Submitted by Xu Guo on

The essential assumption of Cauchy Stress

is the existence of the limit  (\Delta f)/ (\Delta A) as  \Delta A-->0. 

This means that a infinitesimal small area can only sustain infinitesimal

small surface force. Therefore in the framework of conventional continuum

mechanics, we can only talk about the "force density (stress)" at a point.

The expression int_A (f.n)dA has no physical meaning. Only int_A (stress.n)dA

can give the total force exerting on a closed surface A.

Looking for a Postdoctoral/Research Associate Position in PDE/ODE

Submitted by Pavel Aleshin on
job
PDe
ODE
fractional derivatives

 

I have recently (spring–08) completed my Ph.D in PDE with the specialisation in fractional differential equations. If any Professor or research organisation has an opening for a postdoc position in the areas related to my fields of interest, please contact me alyoshinpavel [at] gmail.com

 

thanks for your attention

Pavel Aleshin 

Simulation of a freely-vibrating cantilever beam connected to a box with granular solid particles inside using Ansys- Ls-dyna

Submitted by abeed on

A cantilver beam is connected to a closed box. 3 balls of different sizes and materials are inside the box. the beam was draged litle downward from the middle and then left to vibrate freely. of course, during the vibration, the balls will colide with the box walls and with each others. The question: is it possible to simulate this system with ansys? if yes, How?

Does anyone can help me on spooles package's iterative method ?

Submitted by bobljp on
software

Does anyone can help me on spooles package's iterative method ?
Dear everyone :
I need your help !
I am using spooles , and I have successfully
use it in direct methods which is in directory
/misc/drivers , and I have run into problems when
I use the code in /Iter/drivers , for the demos in it
, I have run successfully , but I want to use the same
matrix of A and b as in direct method when I do in direct,
in fact , I am use a fortran code for main program , I
only to take use of spooles as a subroutine , to solve Ax=b for
me, the code iter.c in Iter/drivers , is a main c program , and I want to
change it as a subroutine for my fortran main program .
and I don't know how to change it to a suitable code . because in the

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