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Opening for new Ph.D. students in the Computational Mechanics group, The University of Iowa

Submitted by Vaibhav Yadav on Tue, 02/02/2010 - 00:01

The Computational Mechanics group at The University of Iowa, led by Professor S. Rahman,

is looking for new Ph.D. students, who are capable of and interested in performing

high-quality research on reliability-based design optimization. The research, supported

by NSF and others, entails developing new theory and efficient algorithms for stochastic

computing and design optimization. A solid background in mechanics and elementary

numerical analysis is a must; some exposure to uncertainty and probabilistic methods is

desirable.

frequency responce- how to track natural frequency of the beam using Abaqus?

Submitted by lkean85 on Mon, 02/01/2010 - 06:12

research

ABAQUS

frequency

frequency responce- how to track natural frequency of the beam using Abaqus? may i have the example of doing that? and the details that need to be considered.

Thanks.

A funny error

Submitted by Arash Zamani on Sun, 01/31/2010 - 16:33

research

Dear All,I have written a finite element code in C++. The results have generally high accuracy. But when I change the order of evaluating r and theta of the polar coordinates in terms of x and y in the sub-program of computing the shape functions, then the results are changed about 10^-9 of the initial results. The change is negligible but I wonder why this happens? I had initially supposed it may be related to some memory linkage in the program but since now I have not been successful to find any. Is there any one to have an idea about this funny error???

A funny error

Submitted by Arash Zamani on Sun, 01/31/2010 - 16:30

research

Dear All,

I have written a finite element code in C++. The results have generally high accuracy. But when I change the order of evaluating r and theta of the polar coordinates in terms of x and y in the sub-program of computing the shape functions, then the results are changed about 10^-9 of the initial results. The change is negligible but I wonder why this happens? I had initially supposed it may be related to some memory linkage in the program but since now I have not been successful to find any. Is there any one to have an idea about this funny error???

How to mesh sandwich 3D structures

Submitted by mwasimak on Sat, 01/30/2010 - 04:43

research

Hello All,

I have some difficulties to mesh the 3D sandwich composite. I want to mesh the outer volume with composite materials with 15 plies and the inner with foam. I don't know how to do so. I've tried to do mesh the outer volume by SOLID46. But I didn't get good mesh due to element coordinate mismatch. Could anybody please suggest me in this regard? I really need your help.

Thank you very much.

Wasim

Exprimental Data for Wall or Structure under Blast Loading

Submitted by m_meisam on Sat, 01/30/2010 - 04:13

research

Dear guys

I've done some numerical research on behavior of concrete wall under blast loading. And know for checking the validity of my results I need some related exprimental data about it. Is there any one who can help me?

Regards

M.Meisam

Journal Club February 2010: Mechanics of Patterned and Structured Interfaces

Submitted by Kevin T Turner on Sat, 01/30/2010 - 02:48

Welcome to February 2010 Journal Club! This month, I look forward to a lively discussion on the mechanics of structured and patterned interfaces in which geometry is used to tailor adhesion. Much of the work in this area has been inspired by a variety of animals and insects that have feet covered with small structures (often hierarchical and sub-micrometer in size at the end) that allow them to strongly adhere to a broad range of surfaces. The best known example is the Tokay Gecko (Gekko gecko), which can achieve an adhesion force much greater than its body weight

Material Properties on Different Elements with Common Node

Submitted by shrimad on Thu, 01/28/2010 - 22:35

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node material property common

Hi,

I am having a conceptual doubt regarding the following case. Any suggestions are appreciated. We are here assuming linear elastic material.

Let's say I have two bodies with different properties, and they share a common node (as in the attachment). However, I want to perform an analysis without any coupling or contact phenomena. Let's say thermal expansion of the bodies.So while doing the FEA analysis, I can assign the material properties in the element stiffness according to the body elements and solve.

On the Path-dependence of the J-integral near a Stationary Crack in an Elastic-Plastic Material

Submitted by Chad Landis on Thu, 01/28/2010 - 21:48

Submitted to the Journal of Applied Mechanics on 2/1/2010.

Pyramid elements in ABAQUS

Submitted by nasibeh325 on Thu, 01/28/2010 - 03:06

research

Hi every body,

I need to generate a mesh around the crack front line in 3-dimensional space using a layer of prism (wedge) elements at the crack line and tetrahedron elements at the rest parts of the model. However, to keep the compatibility we also need to adopt a layer of pyramid elements between wedge elements and the tetrahedrons. Dose any body know how can I do that in ABAQUS? Is pyramid element available in ABAQUS's element library or is there any chance to get that through degenerating another element type? if so, how?

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