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Hello All,

Currently,I am modeling elasto-plastic buckling of laminated composites. I started with 3 layers (fiber-matrix-fiber) respresenting unit cell of composite. The model is made with material non linearity and incremental approach - Modified Riks Algorithm has been used for buckling analysis. My try would be to get plastic buckling in the model. For this I need to introduce "Element Weakening Method" (EWM) which allows user's choice to assign weak properties or reduced stiffness to the selected elements. Consequently, this helps in propagating damage.

Job Summary:

The postdoctoral research associate is expected to
provide research support within the frame of a multi-year engineering
research project undertaken by faculty from the departments of
Mechanical Engineering and Applied Math and Sciences at Khalifa
University. Limited teaching or other academic duties may be assigned to
the successful candidate under the supervision of the Advisor as
required by the University.

The successful candidate will be

One PhD student position is available at Arizona State University for fall 2014. Research background in at least one of the following areas is preferred.

1. Fatigue, creep, and corrosion analysis of materials

2. Computational mechanics and micromechanics

3. Damage detection for composite materials

Interested candidates please send application documents to yongming.liu [at] asu.edu (yongming[dot]liu[at]asu[dot]edu)

greetings,

Hi Im writting my umat subroutine for my analysis but the problem that i had seen in the message file is "The Rate Of Convergence is very slow. Convergence is judged unlikely." may i know what the problem ontha and how can i solved this problem. your help highly appreciated it.

 thanks alot. 

 Regards, 

Ng TP

(thengpin87 [at] yahoo.com)

Greetings my dear friends!

I'm Amin and its my first post!I'm studying mechanical Engineering in Semnan University in Iran and by the time  I'm workin' on entropy generation calculation for laminar and terbulent
fully developed forced flow and heat transfer of nanofluids inside
annul.I'd be really glad if anyone could give me hand with it .

Hi, my question is on the use of Riks and other Arc length methods when analysing  a system for gross plastic deformation. ASME B&PV code , in its investigation for Gross plastic deformation as a Load at which convergence does not take place. Now, as far as I understand, Newton Raphson method fails at locations of singularity in the stiffness matrix and also at Bifurcation points, it can trace the unstable primary paths. Both these issues can be overcome ( provided the limit point is not too sharp) by Riks and other Arc length methods.

Dear imechanica users,



I have decided to learn how to use .ses and .pcl files in Patran to simplify repeatable operations.



In my problem, I would like to consider several beams of the same length, loading/BC conditions etc. but with different cross-section dimensions.

In order to make my calculations fully automatic, I have parametrized both width and height of the cross sections (as REAL a,b) and created nested FOR loops to obtain 20 different designs.



I would be grateful for answers on these questions:

Hello All,

I am modelling a very simple 2D contact problem between a rigid wedge indenter and a deformable squared-shape specimen (general steel material) in frictionless contact case. I used an implicit function f to describe the rigid indenter.



I implemented Lagrange multiplier method for this contact problem and the contact condition is: Inside the contact zone of the deformable specimen, the node set is active if f(node)<=0 and the Lagrange multiplier lambda<=0.