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shawn2
science forum beginner

Joined: 19 Jun 2006
Posts: 1

Posted: Mon Jun 19, 2006 11:35 am    Post subject: About the concept of NDI, NSHR, NTENS

Hi,
I am new to abaqus/umat, and there are some problems about the
meaning of NDI, NSHR, NTENS,DDSDDE.
I found below in the abaqus online document.
NDI is Number of direct components
NSHR is Number of shear components
and NDI+NSHR=NTENS

my questions are as list below:
1) are NDI, NSHR numbers of stress and strain components?
or only refers the number of stress components?
2) what is NDI,NSHR in plane stress?
is it NDI=2, NSHR=1?
and direct stress components are sigma_11, sigma_22
shear components is sigma_12?
3) what is NDI, NSHR in plane strain and axi-symmetric?
because sigma_33 is not equal to zero, is NDI=3?
4) is the length "m" of DDSDDE(m,m) is equal to NDI+NSHR?
if not, how to determin "m"?

Shawn

2006.6.19

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