Ask iMechanica

Dear All members;

I am derived J_integral for dynamic crack propagation, and i have some things that i not yet understood:

1. Why is the integral path must start on one crack sureface and proceeds counter-clockwise to the oposite crack sureface.

2. Why is the value of J_integral independent the radius of integral path at each time increment.

3. What is the difference if we chose the far path and near (close to) path from the crack tip.  

Would you please explain for me, thank you very much,

Best Regards,

Chau

Hi everybody...

 does anyone has ANSYS tutorial for analysis of composites....if so please provide....i would be very grateful to you

im a master studient in the national school of ingeneers in safx tunisia my project consist to the study of the creep behaviour of weld joint in pressure vessels.this work will be done with 2D simulation in abaqus.

so i want some help first for the choice of the right comportment laws to be used and secondly in model to be used in abaqus 

thinks  

Hey guys,

I am right now doing a FEA on cervical spine, however, the annulus property is complex, and I need to represent it by a fiber-reinforced hyperelastic part, I tried a lot, but still are nowhere.

 Can anybody tell me how to assign some embeded layers with elastic rebar element to a solid part ?

Thanks a lot.

Dear all,

I would like to create a model in ABAQUS for studying crack propagation in a rotating shaft loaded by a bending moment. Actually I'd like to reproduce in ABAQUS what RR Moore machine is able to do. Could you please suggest me some material which can help me to build this model in ABAQUS?

Thank you.

Giancarlo 

hi 

i am doing my PhD in  "smart composites"

i am working on piezoelectric composite materails... 

i will be greatful to you if anyone can suggest me  how to model the piezoelectric materials in ANSYS.i am having some doubts in meshing and giving the voltage input to ANSYS.

if i directly glue actuator to the beam using volume glue  then i am getting problem while meshing volume as "invalid topology for mapped brick mesh". how can i glue two volumes in ansys and avoid the problem in meshing???

hi 

i am doing my PhD in  "smart composites"

i am working on piezoelectric composite materails... 

i will be greatful to you if anyone can suggest me  how to model the piezoelectric materials in ANSYS.i am having some doubts in meshing and giving the voltage input to ANSYS.

if i directly glue actuator to the beam using volume glue  then i am getting problem while meshing volume as "invalid topology for mapped brick mesh". how can i glue two volumes in ansys and avoid the problem in meshing???

If one takes powdered iron filings and sprinkles them on top of a sheet of paper with a magnet close underneath, they align to produce a typical pattern we've  all come to recognize as the magnetic B-field.

What would the pattern look like if it was inverted?

The reciprocal of the field, so to speak.

Could it also be described as the A-field?

Hi Everybody,

 I am the new user of Ansys.

 can any body give some detail that if crack propagation is possible using Ansys.

 If possible than what is the way.