GiD forum

To Gid Members

I am not sure the actual meanings of the vector results of the matrix
results, such as stress and strain tensor, Si, Sii and Siii. Are they same
as the max and min principle stresses or not? If not, could you please tell
me the calculation method of them? Actually I would like to express my
calculation results in the form of principle stresses as vectors. How can I
do that?

Best Regards

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Narentorn Yingyongrattanakul
Graduate Student
Dept. of Civil Eng., Kyoto University
naren at kiban.kuciv.kyoto-u.ac.jp
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Narentorn Yingyongrattanakul wrote:

To Gid Members

I am not sure the actual meanings of the vector results of the matrix results, such as stress and strain tensor, Si, Sii and
Siii. Are they same as the max and min principle stresses or not? If not, could you please tell me the calculation method of them?
Actually I would like to express my calculation results in the form of principle stresses as vectors. How can I do that?

Best Regards


Hi Yingyongrattanakul,

when GiD reads a 'Matrix' or a 'Plain deformation matrix' results it calculates
internally the eigen values and vectors of these matrices.

If the matrix is a tensor matrix then these eigen values and vectors are
the main stresses: Si, Sii and Sii corresponds to the Sigma 1, Sigma 2 and
Sigma 3 values of the main stresses; and the vectors shows their direction.

In the stress vector representation, you can choose between the visualization of only
one of the main stresses: Si, Sii or Siii or all of them together.
Blue stands for compression, also drawn like this ----- and
red stands for tension, also drawn like this -----.

If you want to give your own main stresses to GiD, there is the
'Main stresses' result type.
Here the eigen values and vectors must be provided to GiD, for stresses it will be
Si, Sii, Siii, Vector Si: x, y, z, Vector Sii: x, y, z, and Vector Siii: x, y, z.
Note that you can use this result type to show any three vector combination you need,
it does not necessarily be main stresses.

You can find information about the format of this result type under the
item 'File ProjectName.flavia.res' of the section 'POSTPROCESS DATA FILES'.

Hope it helps,
best regards

miguel


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Miguel A. de Riera Pasenau miguel at cimne.upc.es http://gid.cimne.upc.es