Transforming results to local co-ordinate systems

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For brick finite element models, stresses are generally transferred into FEMVIEW in the model global rectangular co-ordinate system. There is a user requirement to provide a means to transform the global stresses into a user defined cylindrical axis system; so that the resulting stresses may be displayed as hoop, radial or axial stresses, relative to the local co-ordinate system.

For that reason, FEMGV 6 introduces the capability to transform results into a relevant local co-ordinate system based on the position of the results within a rectangular, spherical, cylindrical or conical system.

The spaces are defined through the following command :



CONSTRUCT COORDSYS type [name] defn



where :

type = RECTANGUL

SPHERICAL

CYLINDRIC

CONICAL

name = optional name which defaults to CSn, where n is an integer dependent on the number shapes and co-ordinate systems that have been created.

defn = definitions depend on the type, but in general can be divided into those defined by node numbers and those by co-ordinates.

The transformation is then invoked by the command:



RESULTS TRANSFORM LOCAL type name comp



results will be transformed into the global system first, if they are initially in the element local system.



where : comp = RR or XX

HH or YY

ZZ or ZZ

RH or XY

HZ or YZ

ZX or ZX



Note that only one cylindrical system can be specified at a time. Models that require results transformed into more than one cylindrical system (e.g : models with intersecting cylinders) will require the results for individual cylinders to be transformed and viewed separately.

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