element stiffness matrix

[bcmemento]

How can I get element stiffness matrix in ANSYS (classic)?

Thanks

 

[flash3780]

I'm not sure how to print out the global stiffness matrix for an Ansys model, but you're looking for the element stiffness matrix?

You can find the element formulations in the Ansys Applications Theory Reference. For example, a 20-node brick element is discussed in section 12.9.13.20.

http://www1.ansys.com/customer/content/documentation/121/ans_thry.pdf

//signed//
Christopher K. Hubley
Mechanical Engineer
Sunpower Incorporated
Athens, Ohio

 

[omidomidi]

there is way to get the global stiffness matrix of a model,it uses super element to get the stiffness matrix but i dont remember the exact code.

http://www.narmafzar24.ir

Engineering Softwares Company

 

[omidomidi]

there is way to get the global stiffness matrix of a model,it uses super element to get the stiffness matrix but i dont remember the exact code.

http://www.narmafzar24.ir

Engineering Softwares Company

 

[bcmemento]

I'am able to get global stiffness matrix (by commands: file and hbmat). I've read about the way of getting it by superelement. But this is global stiffness matrix. What I need is element stiffness matrix.

for the global stiffness matrix I uses 'jobname.full' file, which contains global stiffness matrix and is written after every solution. Command hbmat extract global stiffness matrix from 'jobname.full' and save custom named file with this matrix in HB format.

Maybe there is similar way to get element stiffness matrix since ANSYS writes 'jobname.emat' file, which contains element stiffness matrices. Problem is that files *.full and *.emat are binary and I don't know command simmilar to hbmat but for elements (if there is any).

The reason I need element stiffness matrix is for calculating potential energy by myself. Ansys uses formula
E(e) = 1/2 * u(e)^T * K(e) * u(e)
(e) represents element