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Hypoelastic materials: constitutive equations in rate form

Submitted by brunda on

Hi,

I want to derive the rate form of the consitutive relation for hypoelastic material:

Jaumann stress rate=L:D

where L is a fourth order modulus tensor and D is the rate of deformation. 

Most papers that I have seen begin with this expression. But I would like to know how to arrive at this equation.

 

Any suggestion?

 

Thanks

Brunda

Free Computation Cycling Time

Submitted by Parameshwaran … on

National Nanotechnology Infrastructure Network Computation (NNIN/C)
Project at Michigan provides free computation cycling time for a limited
time (July 25, 2012 to Dec. 20, 2012) to support researchers in
Nanotechnology (Nano/Microsystems, Nanomaterials, Multiscale modeling,
etc). To get a free computation account, please go to:

 www.lnf.umich.edu/NNIN/Computation/Registration/index.aspx

CM13 - An International Conference on Computational Mechanics - Durham, UK, March 25-27 2013

Submitted by Charles Augarde on

ABSTRACT DEADLINE APPROACHING 31st July 2012

Dear Colleagues

We have received a healthy number of abstracts already for CM13 but we invite you to consider submitting one if you have not done so already. The deadline is 31st July 2012 with full papers due October 15th 2012 (so that they can be reviewed). Please visit the conference website for more details, or contact me directly. I hope some of you can join us in England in 2013.

postdoctoral position

Submitted by addis on

We are looking for a highly motivated
postdoctoral scholar to be filled as soon as possible. Successful applicants
have had a doctoral degree in Mechanical Engineering, Materials Science,
Aerospace Engineering or a related field. Applicant should describe innovative
fundamental research in the field of advanced materials. Examples include but
are not limited to material processing, high temperature materials, ceramic materials,
and powder metallurgy.

Humidity Generation for mechanical characterisations

Submitted by Jan Gorgol on

Humidity has huge effects on multiple multiple mechanical properties such as Stiffness, Fatigue, Creep, bonding, adhesion, corrosion , flowability,stress ,strain in areas such as Polymers, concrete, cement, wood, powders,foodstuff,Bio and other materials.see www.genrh.com for further details or applications.Controlling Humidity critically in conjunction with characterisation techniques such as DMA,AFM,Tensile testing, rheology,XRD,Raman,FTIR and microscopy is key in researching areas such as Moisture Induced Phase transitions, Relaxa

residual stress distribution in pipe

Submitted by amir r on

Hi every body

I study the residual stress derived from a circumferential weld on the end of a pipe and degree of freedom in the other end have been taken

but i have a problem in residual stress distribution along axis of pipe.

 its known that the axial stress at the end of constrainted end should be zero or little but mine is in order of 100 MPa while residual stress is 300 MPa.

can anybody give me a hint about whats the source of error



thanks