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Finite strain finite element formulation

Submitted by Sugeng Waluyo on

Hi ,

 

I am working with finite strain finite element formulation. Normaly, the weak form is derived from equilibrium at a reference configuration or differential of 1st piola-kirchoff stress tensor. In case, we have 10 steps of load increment, is it necessary to update nodal position or nodal coordinate for each step??. I am using newton-raphson method.  

 

best regards,

sugeng

 

Course Notes of Finite Element Analysis of Solids and Fluids by Prof. K .J. Bathe

Submitted by Jung W. Hong on

I thought the mechanics community would be interested in the course notes of

Prof. K. J. Bathe on "Finite Element Analysis of Solids and Fluids". This

course was taught at MIT and now is available freely through MIT Open

CourseWare website:

http://ocw.mit.edu/courses/mechanical-engineering/2-094-finite-element-analysis-of-solids-and-fluids-spring-2008/

Enjoy!

 

"Polymer Nanocomposite Processing, Characterization, and Applications": Special Issue of Journal of Nanomaterials

Submitted by Frank Fisher on

I would like to call your attention to a special Issue on "Polymer Nanocomposite Processing, Characterization, and Applications" scheduled to be published in the Journal of Nanomaterials in May 2010. The Call for Papers can also be viewed at the journal website at http://www.hindawi.com/journals/jnm/si/pnca.htm. The deadline for manuscript submission is November 1.

Modal Analysis of a tapered beam

Submitted by shiva masana on
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Hello everyone

I need modeshapes for a tapered beam, so I am using Ansys. By going through the tutorials I found that a beam can be modeled by creating a line and meshing it using Beam elements and assigning real constants. How can I use the beam elements for a tapered beam where  the real constants are not constant. I tried to use tapered beam element but is of no use as it the created all elements of same real constants creating a profile similar to a hack saw. 

Can anyone please help me how to mesh a tapered beam.

Change in Elastic Modulus with Plastic Deformation

Submitted by Amit Pandey on

Article on web

http://www.eng-tips.com/faqs.cfm?fid=1441

 

The physical basis of material
properties like Young's modulus can be understood by examining
materials on the atomic scale. There are two main things that influence
the value of the modulus:



1.)     The atomic microstructure

2.)     The interatomic bonds.

Simple calculation, Interesting result -- van der Waal interaction of DWCNT

Submitted by weibang on

It is well known that the wall-to-wall interactions play a great part in the deformation of MWCNTs. At the first glance, I thought the pressures, duing to van der Waal interaction, on the inner tube and out tube should be proportional to their radii inversely, because this interaction is a kind of action and reaction. BUT actually it is not the case, as illuminated in our paper published in APL, although this two pressures are both functions of the radii, they are not inversely proportional to the radii.