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Wang Guofeng's blog

schmid factor in the single plasticity code of Huang

Submitted by Wang Guofeng on
research

 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 

If common block can be used in UMAT for parallel computing

Submitted by Wang Guofeng on

Hello everyone

I wrote some codes with umat recently .  They can work well with single CPU. However, the results become very bad for several CPUs. 

I define a matrix with COMMON BLOCK and it seems that COMMON BLOCK can not be used for parallel computing. Are there any ways to resolve this problem?

I am not familiar with fortran.Someone told me that the matrix should be defined by MODULE. I don't know about this.

Please give some helps to me

 

regards,

 

Wang 

 

How to change the value of time increment every step in vumat?

Submitted by Wang Guofeng on

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 

Abaqus: How to display a new tensor define by myself in vumat?

Submitted by Wang Guofeng on
vumat SDV

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 

 

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