Patran二次开发工具PCL系列教程之9

PAT304 Course Notes – Release 9.5 Copyright 2001 MSC.Software Corporation
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PATRAN 2.5 Results Files
There are three formats of PATRAN 2.5 results files that can be imported into MSC.Patran • • • Element Results File (.els) Nodal Results File (.nod) Displacement Results File (.dis)
PAT304 Course Notes – Release 9.5 Copyright 2001 MSC.Software Corporation
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Results Retrieval
Main way to access results in PCL is with res_utl_extract_[type]_results res_utl_extract_nodal_results() requires an integer array of 5 values to define the desired results: • Loadcase ID – res_utl_get_loadcases() • Subcase ID – res_utl_get_subcases() • Primary Result Case ID – res_utl_get_result_ids() • Secondary Result Case ID – res_utl_get_result_ids() • Layer ID – res_utl_get_layers()
PAT304 Course Notes – Release 9.5 Copyright 2001 MSC.Software Corporation
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Loadcases
Loadcases are mainly used to organize loads and boundary conditions Loadcases in MSC.Patran are also used to organize results cases
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Results
Results are arrays of numbers , linking values to FEM entities Results can be • • • Scalar (temperature, Von Mises Stress) Vector (displacement, Fluid Velocity) Tensor (stress)
For example: main_load, config_1: Displacements, Translational
main_load = loadcase config_1 = subcase Displacements = Primary result set Translational = Secondary result set
PAT304 Course Notes – Release 9.5 Copyright 2001 MSC.Software Corporation
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Results (cont.)
Results from various analysis runs can be stored in the same database under different Result Cases • • • Static Transient Non-linear
Most results obtained from an external analysis code are written to one of these three MSC.Patran-compatible results file formats in order to be processed by MSC.Patran You may need to create your own results template file if you intend to create PATRAN 2.5 Results files from an in-house translator
PAT304 Course Notes – Release 9.5 Copyright 2001 MSC.Software Corporation
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Results Files (cont.)
Element Results Files • • • Element results files contain the elemental results quantities for each Analysis Model element analyzed. Up to 200 columns of results quantities can be stored for each element. Contour plot is generated by averaging the element results at the nodes.
Loadcases are, in fact, the first required step to creating or retrieving results Each Loadcase has one or more subcases associated to it Each loadcase/subcase combination will hold one or more sets of results Each set of results can have subsets of results (or none at all)
PAT304 Course Notes – Release 9.5 Copyright 2001 MSC.Software Corporation
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Results Files
Displacement Results Files • • Contains the displacements calculated by the analysis code at the node point There are usually 6 columns in a displacement results file – The first three are the X, Y and Z components of translation – The second three are the X, Y and Z components of rotation • • A single column of a displacement results file can be used for contouring Displacement or rotation vector plots can also be generated
PAT304 Course Notes – Release 9.5 Copyright 2001 MSC.Software Corporation
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Results Files (cont.)
Nodal Results Files • • • • Nodal results files contain the results quantities that have been calculated at the node points. Up to 200 columns of results quantities can be stored for each node. There is only one value per node; therefore, results contribution from an element must be extrapolated and averaged prior to import. Therefore results cannot be divided (or split) by element or material properties and can only be done by reading in separate results.
Programmer passes the Primary and Secondary Result Titles into the res_utl_create… call PCL (through database query) determines what the primary and secondary result ids are to be (based on titles) and passes them back through the array
PAT304 Course Notes – Release 9.5 Copyright 2001 MSC.Software Corporation
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Results Creation
Use res_utl_create_[type]_results() to create results in MSC.Patran Similar array of 5 integers used to create results:
Results are always associated to an entity • • • Nodes Elements Element Nodal
Lower dimensional quantities are always calculated on the fly • MSC.Patran does not store Von-Mises stress when imported from result file. Always calculated at run time from 6 tensor values.