# Layered Slab (LS-DYNA)
When creating a model for analysis in LS-DYNA it is useful to be able to define a composite shell. This is defined in terms of layers of different materials.
# Definition
The composite shell is defined from the bottom up in layers. Each layer is defined by an analysis material, a thickness and an optional angle for orthotropic materials. The total thickness of the shell is determined from the sum of the layer thicknesses.
# Syntax
The description of hollow slab profile is
(unit) L (mat thick angle) ...
where
- unit – the units defining the profile
- L – layered slab
- thick – the layer thickness
- angle – the angle of the layer for an orthotropic material
The material, thickness and angle are repeated for each layer.