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Delamination mode failure

Submitted by ramdas chennamsetti on

Hi all!!!

General theories of failure of laminated composites are Tsai-Hu, Tsai-Hill, Maximum stress and maximum strain. These thoeries do not specify which component (fiber or matrix) of lamina fails.

Sigma_zz, sigma_xz and sigma_yz are out of plane stresses which cause delamination failure of laminated composite structures.

I am looking for exclusive theories of failure which govern delamination failure in laminated composites. I request those who work in this area to help.

Thanx in advance,

Regards,

- Ramdas

"Classics" in iMechanica

Submitted by Jayadeep U. B. on
education
Classics

Dear all,

While reading some "old" discussions in iMechanica, I have come across
a blog by Zhigang to have a collection of "classics" in iMechanica. 
Immediately, I searched for such a section, but couldn't locate it.  Is
it ever made?  If not, why not start it now?  I am sure there will be
many juniors like me, who are eager to read those classics.

Spatial Control in the Heterogeneous Nucleation of Water

Submitted by Kripa Varanasi on
research
nucleation
condensation
superhydrophobic
superhydrophilic
wetting

The attached paper was recently published
in Applied Physics Letters. We show for the first time that Nucleation and
Condensation of Water can be spatially controlled. Such control of nucleation
phenomena and the fundamental findings discussed in the paper have implications
for the Energy and Water industry. The paper can be found at http://link.aip.org/link/?APL/95/094101/1

Engineering strain vs logarithmic strain

Submitted by kajalschopra on
Forums
Computational Mechanics Forum

Engineering Strain vs Logarithmic strain I would like to have your (experts) interpretation on Engineering strain and Logarithmic strain.  Based on what I’ve studied, I would request your comments on what I state below in regard to Engineering strain and logarithmic strain: 

Lightweight structures

Submitted by R. Gabbrielli on
research
Lightweight structures
porous materials

For those of you interested in the geometry of light frameworks and models for extremely porous materials, here are a couple of links. The first one contains two 3D objects. You need Java to view them.

http://people.bath.ac.uk/rg247/swansea/javaview/gyroid_146_007.html

http://people.bath.ac.uk/rg247/swansea/gyroid_146_007_n.png

Non linear (geometric non linearity) problem- Programming shallow truss element-Reference book by Crisfield

Submitted by bruno-page on
Forums
Computational Mechanics Forum

I’m trying to program geometric non linear analysis (finite element)-for a shallow truss element.I am using the book by Crisfield for the purpose. Basically, I am using the incremental approach for analysis.And I am struck with a problem.The problem is that my Structural stiffness matrix (after application of Boundary conditions) is singular i.e. it’s determinant value is “0”.

Can somebody suggest a general-purpose object oriented design of the finite element?

Submitted by Wenbin Yu on
software

I am looking into object oriented programing of the finite element method. I don't know whether somebody can provide a general-purpose oop design of a general finite element program, say a linear static analysis of a 3D solid. Or somebody who are experienced in this field point out some good references for this purpose. It will be better if the oop design is language free, i.e. not directly related with implementation in a specific language such as c++. Thanks in advance.

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