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Why not Gurson-Tvergaard-Needleman void growth model for plate impact simulations?

Submitted by sivaprasad.avs on
fracture
Plate impact spallation

Can someone answer me if Gurson-Tvergaard-Needleman void growth model is not suitable for flyer-plate impact simulations? I have come across some papers who have derived void growth equations to simulate fracture in ductile mateials like OFHC copper etc., subject to plate impact (uniaxial strain high strian rate loading). I have attached 3 of them. But none of them have used Gurson's yield function. I did not find any explanation if GTN model has any drawbacks in simulating spallation phenomena found in plate impact simulations.

Upload Your Tutorial for a Chance to Win a 3Dconnexion Space Navigator Mouse!

Submitted by SIMULIA on
software
ABAQUS
SIMULIA
dassault systemes

5 Minutes, 100 Mb, but only THREE will win...

If you
have ever created a useful tutorial or if you have ever had a great idea for a
tutorial, but you’ve never had the time to create it - then now is your chance to share your
ideas with other SIMULIA users! Beginning in May and ending in June
we will be accepting submissions of tech-tip tutorials. The winners will be
announced in August and will receive a 3Dconnexion Space Navigation Mouse.

PhD scholarship on: "Reduced Order Model of PGD type application to numerical computing in high cycle fatigue"

Submitted by saberelarem on
job
numerical methods
High cycle Fatigue
polycrystalline aggregates
Model Order Reduction
Proper Generalized Decomposition (PGD).

A fully funded PhD scholarship exists in the area of solid mechanics at
the Arts et Métiers ParisTech, CER Angers, France. 
http://www.ensam.fr/en/.

The successful applicant will have a  Masters' degree  in
solid mechanics, physics or applied Mathematics . He/she 
is expected to have very good numerical
skills.

Biographical Memoir of Zay Jeffries by W.D. Nix

Submitted by William D. Nix on
education
history

I have written a National Academy of Sciences biographical memoir of Zay Jeffries, one of the great American metallurgists of the 20th century.  I am posting the link to the NAS website here with the thought that some readers of iMechanica might be interested in the piece.  Some will be interested to learn that Jeffries came very close to discovering dislocations some 18 years before the great papers of Taylor, Orowan and Polyanyi in 1934.
 

Python

Submitted by Anonymous (not verified) on

Having learned Python for a while now, I believe it is of benefit to students who want to learn statistical analysis and such models and be able to compute these. Python is an easy to learn language. Oh and did I mention George   his is for  you ;)

Professor Rod Clifton to Receive Sigma Xi Monie A. Ferst Award

Submitted by Dibakar Datta on
mechanician
solid mechanics
engineering
Award
Brown
Clifton

Rod Clifton , Rush C. Hawkins University Professor Emeritus and Professor (Research) at the School of Engineering at Brown University, has been selected as the winner of the 2013 Sigma Xi Monie A. Ferst Award .

Numerical Simulation of Particle Stress and Fracture using FEMDEM: Application to Process Catalysts

Submitted by marigom on
job
fracture
phd
mechanics
FEM
design
Imperial College London
DEM
johnson matthey
discrete element modelling
catalyst
finete element modelling

Numerical
Simulation of Particle Stress and Fracture using FEMDEM: Application to Process
Catalysts

Johnson
Matthey CASE/EPSRC PhD Studentship Award- Duration 36 months

 

Supervision:

Dr JP Latham, Dr Jiansheng Xiang

Industry Contacts:

Principal Investigator - Dr Michele Marigo

Co-investigators - Dr Mikael Carlsson, Prof Hugh Stitt

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