Wang Guofeng's blog

 Hello

In the code of Prof.Huang, the schmid factor was defined.

For slip deformation tensors

slpdef4=s1m2+s2m1 

slpdef5=s1m3+s3m1

slpdef6=s2m3+s3m2 

For slip spin tensors

slpspn4=(s1m2+s2m1)/2

slpspn5=(s1m3+s3m1)/2

slpspn6=(s2m3+s3m2)/2

 I can't understand the difference of 1/2. Please give me some explanations.

thanks 

wang 

http://www.columbia.edu/~jk2079/fem/umat.html

Hello, all

I have a new question in using vumat. As you know, time increment, dt,  is usually  determined in the xxx.inp before calculation. I know there are two ways, automatic or constant.

I want to know if there is the third way. So, I can control the value of dt for every step according one state variable I defined. 

This idea seems a little crazy. But this is really very important for my code.

Please give me some help.

regards;

wang 

Hi, all

I am writing one code of vumat. I want to know how to display the contour of a new tensor define by myself in vumat.

It is seems that we can use SDV to realize this in UMAT. But in vumat, how to display the results in the post processor of abaqus?

thanks 

wang 

Hi, all,

I am writing one code of vumat. I want to know how to get the element number of current material point in vumat.As you know, we can know it in umat from NOEL. But in vumat, how to get it?

thanks 

wang