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Vibration testing of a football helmet

Submitted by ruzzene on

Dear All

please find a link to a story describing the results of a final project that I assigned for my graduate "Experimental Structural Dynamics" class. This is timely, on this Superbowl Sunday and the broad coverage of safety issues related to Football and head injuries.

http://coe.gatech.edu/content/tech-research-holds-key-better-football-h…;

Neutralization of errors

Submitted by mohammedlamine on

Hello,

The problem in numerics is the neutralization of the errors for example plus (+)error and minus (-)error. For that reason it is difficult to locate a convergent process. Some numerical algorithms avoid these omissions like leat squares methods which handle the square of the errors in the minimization function. In the other applications like solving processes truncating errors and roundoff errors can be analyzed successfully.

Extract natural frequencies in abaqus

Submitted by Davidgc on

Hi all,

 I am new in the blog, so I would like to appologies if this post is already published.

 I am doing a research in vibracion-based health monitoring based in CFRP beams. As a part of my research, I am modeling a composite beam in abaqus and apply transient analysis on it. Before I would like to validate my model with a very simple a easy model for this reason I have elaborated this procedure:

Journal Club Theme of February 2014: Energy Challenges and Mechanics

Submitted by Henry Tan on

Since James Watt, a Scottish inventor, improve the efficiency of steam engine, human civilization relies more and more on a steady supply of energy. The re-rise as an international superpower and the global energy crisis are challenging China and the world. We are at a transitional age. On the one hand, we see the technology advances in exploration and development of oil and gas, a depleting resource; and the growth in handling ageing and decommissioning. On the other hand, we see ideas and plans for new energy structure in the future.

Phase-field modelling of crack in fixed grid

Submitted by prerakchitnis on

In phase field method how one can specify the crack in fixed grid?



In case of finite element method one uses two overlapping nodes to model crack, which nodes separate after crack propagation. In case of phase-field, generally people use fixed grid finite difference method. My question is how the same node point can show two different displacements when crack has passed through it like FEM?


Can buckling and instability of a structure be affected by Eshelby forces?

Submitted by Davide Bigoni on

Can buckling and instability of a structure be affected by Eshelby forces?  

We provide a positive answer to this question, see http://www.ing.unitn.it/~bigoni/blade.html


 

regarding Microstructure analysis in ABAQUS

Submitted by deepumaj on

Hi all,

 I am doing microstructure analysis in 3D. To implement anisotropy, i need to give the orientation data. Does anyone know, how to give the orientation in ABAQUS?

The data i have in hand is Euler Angles... Can i give the data manually for four of five grains?

Also, please tell me about the ORIENT subroutine in ABAQUS...