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instability induced by incoherent twin boundary in nanotwinned copper

Submitted by Rongmei niu on
research
TEM
nanotwinned copper
coherent and incoherent twin boundary

1. Strain hardening and softening in nanotwinned Cu:

Nanotwinned Cu foils with about 99% coherent twin boundaries (TBs) among all the boundaries were made. These coherent

TBs, with an average spacing of 25 nm, were engineered approximately parallel to foil surfaces. Low plane-strain deformation

enhances the hardness by refining microstructure and introducing dislocations. High plane-strain deformation results in crystallographic

lattice rotation and reaction between dislocations and coherent TBs, and induces incoherent TBs, thus twin coarsening and

buckling

Submitted by mahdi.ahmadpor on
research

dear all : Ihave problem in  dynamic buckling analysis in abaqus ,I simulated a shell part and put it between  two rigid plates and next i put velocity on the one of the rigid plate for buckling-my value of velocity is 8.33e-5 and its very small value .now after the analysis the shell body was not crushed when i increase the value of velocity the crush will occur but i want crush will occur with this velocity and i dont know what do i.please help me.

Using Substructure for contact modelling in Abaqus

Submitted by Marko_carl on
research
Using Substructure for contact modelling in Abaqus

I have a
problem to use substructure for contact anaylsis of two gears. I have
already read the example in abaqus Example problem manual for help.
Well, to explain my problem in detail, I have two nastron files of two
gears and later using FORTRAN I am able to write the programm to
generate the *.inp files. What I tried to do is

1. Substrcture generation of two gears in seperate files. Now I have two
sets of substructures available for individual gears. While generating
the substruture, I have retained the DOF for the nodes which are on the

Vibration testing of a football helmet

Submitted by ruzzene on
research
football helmet
impact response
vibration testing
Laser vibrometry

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
research

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
research
ABAQUS
contact
Composites
Natural frequency
constraints

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
research
mechanics
Journal Club Forum
energy challenges

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
research
crack
phase field simulation

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?


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