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Model 16 - Orthotropic Materials

In order to use orthotropic materials either make a regular mesh or use a composite material lay-up.  A regular mesh is not always possible in all situations. If you have an irregular mesh the element axes will not necessarily aligned with the surface axis.  If a thick shell elements is used, such as QTS4 that has composite properties, in combination with an orthotropic material, by default the material axes will follow the element axes.

You can align the orthotropic material in any direction by using a local co-ordinate dataset (Attributes > Local Coordinates...). When a Cartesian co-ordinate set is generated and you assign an orthotropic material to a selected feature you will then be given the option to assign to lines surfaces etc. in addition to specifying its orientation to a local co-ordinate system.

Once a local co-ordinate system is created you can then transform results to be orientated with the directions of the local co-ordinate axis.  Further information on local co-ordinate systems can be found in the Modeller User Manual page 167.

For an example on the use of composite lay-up please see our Composite Example Manual "Linear Analysis of a composite strip".  For the orthotropic materials rather than the model "5-thick" use "6-solid". This in combination with the composite lay-up (Attributes > Composites...) should solve the problem that can be experiencing with "model 16".  Align of the orthotropic material in any direction can be done by using a local co-ordinate dataset (Attributes > Local Coordinates...).  Note that in a composite analysis the material lay-up automatically assigns the material dataset to the model at the same time.  The material dataset therefore does not have to be directly assigned to features. 

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