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Abaqus UMAT problem

Submitted by yoon on
Forums
Ask iMechanica
Hello

I'm a new commer in Abaqus and working on topology shape optimization for dental implantation.
I have two user-defined materials for Jaw bone area, and using the stress-increment-controlled method
Young's modulus of an element is changed according to the following equation (1) with two constraints (2)

E(i+1) = E(i) + k(sigma(i) - sigma_ref)   --- (1)

where k and sigma_ref are constants

E(i+1) = E_min if E(i+1)<E_min

Two Ph.D. positions are open at the University of Brescia, Italy

Submitted by Anonymous (not verified) on
job
fracture mechanics
computational mechanics
dynamics



The group of Mechanics of Solids and Structures at the  University of

Brescia is seeking two candidates for Ph.D. positions. The appointment

is starting on January 1st 2011, application deadline Sept. 15th 2010.



The research topics involve: computational dynamics of solids with

reference to ground motion simulation due to seismic input, multiscale

computational fracture mechanics and discrete dislocation mechanics.



Interested applicants are welcome to send a resume to

Programme of the CONTACT course now available

Submitted by Edwin Vollebregt on
education
friction
rolling contact
contact mechanics

Dear all,

 The programme for the course on "Contact mechanics with the CONTACT software", to be held October 28th-29th 2010 in Delft, the Netherlands, is now available via the registration form on our website www.kalkersoftware.org.

Best regards,

Edwin Vollebregt

 

Seeking opportunity as Postdoctoral Research Fellow/Structural Analysis Engineer.

Submitted by Sushil Singh on
job
multscale damage evolution in composites
viscoelasticity
FEA
crack propagation cohesive elements fracture criterion
Polymer matrix composite

SUSHIL SINGH
Address: 417 Reed street
Tuscaloosa, AL 35401
Tel :   (205) 239 1696 E-mail : singh.sushil [at] live.com (singh[dot]sushil[at]live[dot]com)

 OBJECTIVE: Seeking opportunity as Postdoctoral Research Fellow/Structural Analysis Engineer.

SUMMARY:

could somebody help me to find a paper ?

Submitted by aken on

could somebody help me to get a paper,named 

A review of recent masonry research and its relationship to the masonry 2007 innovation and research strategy

i'm now doing some work on masonry structures, about seismic resistance , sesimic assessment, and numerical modeling , restoration of masonry structures,

so somebody else doing this work now ?  we can talk about this subject.

CONSTANT Velocity Gradient

Submitted by John Craighead on

I'm hoping that someone can share the physical significance (i.e. type of motion) resulting when the (spatial) velcity gradient L is constant. I'm not certain if L constant wrt to only position or also time. Gurtin (The Mechanics & Thermodynamics of Continua, pp. 107-08) uses this assumption to develop the motion equation given below.

questions about abaqus software package

Submitted by Loay-kh on
research

Hello

I was analyzing pavement subjected to traffic wheel load. I was using the load as cyclic pressure. Suppose an amount of pressure with 200 different time frame. But I am not getting the right result as measured. So, would you please help on applying moving load? How can I assigned that load as moving load? where can I find the step load function? how can I determine the initial increment? is it more realistic to simulate the wheel load as dynamic? how can I do that?

Thanks a lot.

 

 Best regards,

Loay

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