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Stress intensity factor for 3D crack in ansys

Submitted by kirthanlj on

Hello to all the research scholars. Sir, I am a Phd student in computational fracture mechanics. Right now i am stuck with a problem where i am not able analyze SIF (K1, K2, K3) for a 3D crack in ansys. Ansys asks the path for K value and i am choosing 5 nodes along the 2 crack edges for a full crack model and I also went for both global coordinate system and local coordinate system for finding K. Finally when i went to nodal calc and SIF then it is giving only plane stress and plane strain conditions with full or half crack models. But I am not able to get SIF on the crack front as i am not choosing the path along the crack front. It is only giving SIF at the crack tip considering only the area. Am i not correct or does ansys has limitations on this. Please guide me in this.

stepTime VS. totalTime

Submitted by mmoriche on
software
ABAQUS
User Subroutine
STEPTIME
TOTALTIME

Hello everyone,

 I have a problem with one user subroutine.

The fact is that, debugging the subroutine I see the totaltime different from the steptime. I am using just one step and the .inp implementation is veryfied with a different user subroutine, so totaltime and steptime should be exactly the same (but they are not...)

 

The value of the total time is around 1e-8 and the value of the steptime is around 1e-55.

 

Could anyone give me a clue?

 

Thanks in advance.

Abaqus CAE

Submitted by adarshchatra on

Hi,

I am analysis for installation of pile in soil (Pile rigid body and Soil Eulerian material)simulation in Abaqus\ CAE. 

I have given reference point on the pile to assign the mass of pile(top portion). (Pile penetrates vertically into the soil)

I have to give centrifugal force to Pile (300 kN), where can I assing the force? (Point of assignment). And how can I give predcribed displacement of Pile (say 10m)

 

Tensor operation

Submitted by sidd04mech on
Double dot product of 4th order tensor

I am trying to make a material model for my FEM come and while deriving Elasticity tensor I found a term where I have to do some tensor operation. It is as below

P:C:PT  where all the terms are 4th order tensors. Now I konw the result of this should be a 4th order tensor only as this term is in addition with other 4th order terms. Here any (A:B) indicates Double dot product between A and B. 

Please help me out with this if you know or suggest some good tensor calculus book where I can refer for my problem.

Thanks.

 

How to perform surface boundary integration in elasticity fem?

Submitted by xiashengxu on
research

This is a basic question regard to elsticity fem.

How to compute traction boundary integration numerically in elasticity fem under general situation? That is:

\int_{\Gamma} [N][t] d\Gamma,   here [N] is shape function and [t] is surface traction

 My E-mail: shengxu.xia [at] yahoo.com

Thanks a lot

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