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It is well known thatdislocations in FCC metals are composed of partial dislocations separated bystacking faults.  When consideringthe reactions of dislocations with each other, such as in DD simulations, it is necessary to determine therelative positions of the partials in order to correctly describe theconfigurations that are created in the reactions.  Here we describe a geometric method for correctly determiningthe relative positions of the partials. The results we obtain can also be found by applying an axiom, or rule,given in the book by Hirth and Lothe. At the end of this tutorial we

Hi Everyone,

 I would like to measure the residual stress imposed pattern through thickness of the plate by forming process (bending). Is it possible?

 I came to know that residual stress measurement through HOLE DRILLING METHOD offers only on the surface. That too, applicable only when residual stress imposed is uniform through thickness (like shot blasting process). If any one came across the experience of residual stress measurement, please throw some light in this regard.

 Thanks in advance

 M Gopalakrishnan

Hello All//

I am always confuing on that Stress is a point Function..and not Seen Physically Than Stress is a material Property or Material Behaviour?

Waiting For Answer..

Thanks..

Here is an interesting link I came across while searching for the Feynman lectures -- Project Tuva.

http://research.microsoft.com/apps/tools/tuva/

It provides each of Prof. Feynman's seven lectures delivered at Cornell as a part of the Messenger lecture series. This format of posting lectures by Microsoft is absolutely amazing. I hope more such lectures especially videos of keynote lectures in leading conferences and congresses can be made available online.

-Arun

I have to analyse the carbon/epoxy composite laminate in ANSYS,  to determine the natural frequency of rectangular composite plates. The plate is simply supported . I  am not able to model the composite lay up with the correct orientation of the fibre. so any body have the step by step procedure for modelling the composite lay up in ANSYS and how to determine natural frequencies  please give it to me on my e-mail:  sharma_avadesh@yahoo.com

I am confused about the use of two-point tensors in elasticity. The deformation tensor F and first PK tensor are two point tensors, and the "two-point" property arises from use of two different Coordinate System When a continuum body is deformed, why it is necessary to move the Coordinate System as well? (or alternatively, why the coordinate system is attached to the body itself??, isn't it possible to use a general coordinate system which can represent the deformations and also account for the rigid body rotations of the continuum body?).

Hi Everyone,

 Is is possible to account the surface hardness effect in the tensile testing specimen? If possible, how could it be acomplished?

For instance, I would like to establish the  stress strain curve for the material that used on surface hardened component. Will there be a big change if the surface hardness effect is considered on the tensile specimen?

Please throw some light in this regard.

Thanks

M Gopalakrishnan

Dear All,

How do find the inverse of the rectangular matrix.

I want to what exactly entropy means???I know the definition and formula but still not getting the physical significance.When we say temperature we can understand and feel it.But,in case of entropy each time I read about it I don't get it.Can anybody explore it's significance in easy way so that i can understand what exactly entropy means?

In May 2008, I posted 3 lectures on Soft Active Materials given at UCSB.  I have since given similar lectures on other occasions, but never all three at the same place.  The field has been active.  The lectures have been updated with new items.  I’m now posting the “2nd edition” of these lectures.

• Dielectric elastomers
• Neutral gels
• Polyelectrolyte gels
• pH-sensitive gels 

The slides are posted as delivered.  No effort is made to eliminate repeating slides. 

Hi there,

I am new to Finite element method. I would like to know if their are any books for implants, bones and their interaction.

Thank you for your consideration.

Any one can tell about the modelling of viscoelastic materials in ANSYS. In the modeeling how material properties can be given. Like I have material data in the form of Prony series parameter. If sone is having relaxation data how can that be fed to ANSYS model?

TIA

RKPATEL