Skip to main content

The Change of Microstructure at low temperature

Submitted by Shaomin Xiong on
Forums
Ask iMechanica
Choose a channel featured in the header of iMechanica
research
Free Tags
Plasticity
microstructure
Alloy

Recently, we do some work about the dynamic strain aging. In order to investigate the function of solute clouds and precipitates in DSA, we do some experiments. The solution treated LY12 alloys are tested on MTS at low temperature (173K), and the Portevin-Le Chatelier phenomenon disappeared as we expected. But, we need more information about the change of microstructure under the low temperature, what is more the micro-optical observation should be finished in a very short time when we consider the effect of natural aging. Obviously the TEM can not meet our needs.

Equilibrium and stability of dielectric elastomer membranes undergoing inhomogeneous deformation

Submitted by Tianhu He on
research
suo group research
dielectric elastomer membrane

Dielectric elastomers are capable of large deformation subject to an electric voltage, and are promising for uses as actuators, sensors and generators. Because of large deformation, nonlinear equations of state, and diverse modes of failure, modeling the process of electromechanical transduction has been challenging.  This paper studies a membrane of a dielectric elastomer deformed into an out-of-plane, axisymmetric shape, a configuration used in a family of commercial devices known as the Universal Muscle Actuators. 

Recommending a book on FSI with recent discussion on Immersed Boundary/Continuum Methods

Submitted by xwang on
research
FSI Book

I am writing to recommend my book “Fundamentals of Fluid-Solid Interactions-Analytical and Computational Approaches” recently published by Elsevier Science.  The book is available in amazon.com webpage  or Elsevier Science webpage.  The following is

Computational Mechanics PhD opportunities for Top Class Chinese Students

Submitted by Stephane Bordas on
job
computational mechanics
China
phd
scholarship
Fellowship
UK
Glasgow

Dear Chinese students interested in a PhD in computational mechanics, 

You will find below some information on a fellowship you can apply for.  

http://www.gla.ac.uk/studying/scholarships/internationalscholarships/...

China Scholarships Council

Deformation gradient in VUMAT of ABAQUS

Submitted by zhpeng on
Forums
Ask iMechanica
Free Tags
VUMAT
Deformation gradient

Dear All,



     In ABAQUS manual, it is said for hyperelastic material, it is better to define it by stretch tensor U. But if I need to use deformation gradient F in the material model directly, I need to rotate the stress back to corotational frame. How should I do that?  Should I make a polar decomposition of F=R*U first, and then apply Rt*S*R? or I can use the relative spin increment already provided to do that? If so, how?



Scholarships for Computational Mechanics in the UK for non-EU students

Submitted by Stephane Bordas on
job
students
computational mechanics
phd
scholarship
Ph.D. position
UK
non-EU

Dear non-EU students who want to study in the UK,

You are encouraged to look at the fellowship offers below. If you qualify for these and are interested in working in a dynamic group in computational mechanics in Glasgow, please contact me directly stephane dot bordas at gmail dot com

 Our department has a growing team of PhD students (more than 20 at the moment) working in cognate disciplines, which will give you a unique opportunity for a strong PhD in computational mechanics. 

iMechanica will be down briefly at 10 am this Friday

Submitted by Zhigang Suo on

Just got a message from Lesley Lam, iMechanica user number 1, as follows.  Harvard School of Engineering and Applied Sciences IT is in the process of moving our servers to a faster, newer host.  As part of this process, I would like to take down iMechanica for about 10 minutes on Friday October 3rd at 10am.  I am hoping this will improve performance and reliability on the machine as well.

Call for fellowship applicants PhD ORSAS

Submitted by Stephane Bordas on
job
PhD Studentship
international students
non EU students

Dear international, non EU students,

 I am looking for high quality applicants for the following prestigious fellowship:  http://www.orsas.ac.uk/

If you have experience in computational mechanics or numerical methods and would like to join a vibrant research group in Glasgow, UK, if you already have international publications in leading journals, then, send me 

- your CV

- a statement concerning why you think you are the best candidate 

- a list of three references

Subscribe to