### 5.1.5. Limitations of Draping Simulations

The draping simulation approach has the following limitations:

- The surfaces to be draped must be smooth. No sharp edges are allowed.

- The draping procedure does not change mechanical properties of the ply by default. However, mechanical properties can be altered if a shear-dependent material is defined. For more information, see Variable Material Data in Composite Analyses.

- Ply thickness does not automatically change as a result of a draping procedure. A thickness correction can, however, be activated in the modeling ply properties.

- It is assumed that fabric transverse direction is initially perpendicular to the principal direction 1.

- The fiber slippage is a phenomenon that takes place after the locking limit and is noticeable only at relatively high deformation levels. The fiber slippage is not considered in this draping approach.

- The draping coefficients d1 and d2 have no effect. It is recommended that you set d0 = 1.0.

- It is known that some geometries can lead to flawed or deficient results, for example draping across a complete cylinder. This issue can be rectified by subdivision of the draping geometry.

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