UPF programming for 4-node user element 1

[ansysUPF]

I want to creat a 4-node user element for 2D isotropic inhomogeneous material, the most important part is the stiffness matrix I need to offer. And later I want to extend it into 8-node element(like PLANE82, triangular option should also be available).

Any help or information will be greatly appreciated.
A million thanks in advance.

What I have now is a very old version of UPF Guide:

http://www.uic.edu/depts/accc/software/ansys/html/prog_55/g-upf/UPToc.htm

 

[ansysUPF]

Since nobody replied. I'm going to give my steps. Maybe wrong, but I am trying. and will tell my results later. Cuz i myself don't know the results yet. and i believe many people have such experiences.

 

[ansysUPF]

My 1st step:
a)modify uel101.F and test with testcases.
b)modify the uec101.F and uel101.F to be LINK1 element, so as to get some feeling.

2nd step:
try to write a similar element to my target element, for instance, a 4-node linear or quadraliteral element for 2D linear isotropic inhomogeneous material to the 8 node quadraliteral element and 6 node triangular element.

BTW, my material is 2D LINEAR ISOTROPIC INHOMOGENEOUS MATERIAL.
I mean I know many people have done such job and have rich experiences. I need your help really! Thanks a lot!

 

[ansysUPF]

On my way to change the LINK8(original uel101.F) to LINK 2,
what has happend.

 

[gasser3000]

how did u use "ansys80cust" with your user element ??? i can not use it in ansys even after i git the ansys.exe file??!!