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MATP

MATP, mat_nr, type, value;

Assigns material properties to material reference numbers

  • Model items such as primitives of masses or anchors, springs and moving fingers of comb cells are related to a material reference number.
  • Material reference number 1 is automatically assigned to springs but can be used for other model items as well.
  • Isotropic or orthotropic elastic properties are considered for suspension springs.
  • Isotropic elastic properties are defined by ex and nuxy parameters only.
  • Mass bodies are considered rigid and take just density values into account.
  • The ance flag defines which areas of the anchors should reach the substrate surface. Anchors are defined by a zero body reference number (see RECT, CIRC, TRIA or POLY command). Anchor primitives must be assigned different material reference numbers if only parts of the anchor region should be extended to the substrate surface. The material properties can be the same. If the ance flag is set to true, the associated anchor primitives are extended to the surface, otherwise not.
  • Materials used inside of other material areas must have a higher material reference number.

Input Data⚓︎

Parameter Description
mat_nr Material reference number
→ > 0
→ Empty if type = esys
→ Empty if type = eps
type Material parameter type
→ name = Material reference name
→ ance = Anchor extension (true, false)
→ dens = Density
→ ex = Elastic moduli x-direction
→ ey = Elastic moduli y-direction
→ ez = Elastic moduli z-direction
→ nuxy = Minor Poisson’s ratio
→ nuxz
→ nuyz
→ gxy = Shear moduli
→ gxz
→ gyz
→ eps = Permittivity
→ visc = Dynamic viskosity
→ mfp = Mean free path at reference pressure
→ pnorm = Reference pressure for mean free path
→ pamb = Ambient (surrounding) pressure
→ esys = Orientation angle of the Material
Coordinate System (MCS) in degrees
value name
→ Alphanumeric name, has to start with a letter
ance
→ 1 or true, Anchor extension (default)
→ 0 or false, No anchor extension
Otherwise: Value of the material parameter

Modeling of anchor extension areas

Figure 1. Modeling of anchor extension areas