iMechanica - Possibility of modifying the tangential stifness matrix using external subroutines in abaqus - Comments

Sanga Ha

shinubaby963 — Tue, 01 Feb 2011 14:04:49 -0500

Can u please upload any example code for it

nonlocal damage (integral formulation)

hadi — Mon, 15 Nov 2010 07:53:48 -0500

Hi, what you are doing is also interesting for me, since I am trying to implement the nonlocal damage based on integral formulations in ABAQUS (UEL). Definitely, UEL gives us the possibility to modify the element stiffness matrix for the newly fomed part of it as you mentioned. However, what I am struggling about is how to stop the simulation after it once went through all the Gauss points in the same time incerement to build the nonlocal part of damage based on averaging over the neighboring Gauss points!

do you have any hint in this regard?

Best,

Hadi

Sang Ha

unsrohith — Sun, 21 Jun 2009 13:29:09 -0400

Hi thank you even I thought the same after going through the documentation..

Rohith

UEL subroutine

dubuking — Sun, 21 Jun 2009 02:37:04 -0400

Greetings,

For your situation, UEL subroutine can be used to define a new element for non-local damage model. In SR/ UEL you should defined the RHS(residual force vector) and AMATRX(stiffness matrix) for your constitutive model.

Best regards,

Sang Ha

stifness matrix modification in ABAQUS through user subroutines

unsrohith — Sun, 21 Jun 2009 00:27:14 -0400

Hi,

I am working on implementation of non local damage mechanics model in
abaqus using external subroutines, But in that case I have to modify
the stifness matrix by adding the newly formed nonlocal stifness, Out
of the available external subroutine options in abaqus documentation if
any one gives the option to modify the tangential stifness matrix.

Rohith

Possibility of modifying the tangential stifness matrix using external subroutines in abaqus

unsrohith — Mon, 15 Jun 2009 12:54:24 -0400

Hi,

I am working on implementation of non local damage mechanics model in abaqus using external subroutines, But in that case I have to modify the stifness matrix by adding the newly formed nonlocal stifness, Out of the available external subroutine options in abaqus documentation if any one gives the option to modify the tangential stifness matrix Please help me in the same.

Thanks and Regards,

Rohith