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2 Open PhD Positions in Petroleum Geomechanics at LSU

Submitted by Arash Dahi on

I am currently seeking candidates for two PhD positions in Petroleum Engineering at Louisiana State University (LSU). The successful candidates are expected to possess a master degree in engineering or science and have experience in the area of computational mechanics or finite elements and continuum mechanics.The candidates will be working in the area of hydraulic fracturing, poroelasticity, and mechanics applied to fluid flow in fractured porous media.

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.

Flexural-Torsional behavior of thin-walled composite beams

Submitted by composite20 on

I'me a student at the Departement of Civile Engineering of university of the algeria.

currently, i'm working on completing my thesis. My research area in general is in mechanics of composite materials. My problem is that of formulating the FEM solution to the Flexural-Torsional of laminate composite beam having orthotropic layers.

To plot a variable

Submitted by nitinchandola on

Hi everybody,
 
I have a question. I am using a UMAT and calculating a variable (tau=resolved shear stress) within the UMAT using other variables calculated in the UMAT for each time step. Now I want to plot this variable. How can I do this? This variable is not  only a function of pre-defined variables but also a function of variables calculated in the UMAT. 
 
I tried going through the USDFLD, UFIELD and UVARM subroutines but could not figure this out
 
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