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2018-12-03
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Surface Stiffness

In general, a distinction is made between the following relative stiffnesses:

  • Bending stiffness
  • Torsional stiffness
  • Shear stiffness
  • Strain stiffness

Stiffness Types in RFEM

  • Standard (isotropic surface)
  • Without membrane tension (like Standard but failure of membrane stiffness under tension)
  • Orthotropic (orthotropic surface, different stiffnesses in the x- and y-direction of finite elements)
  • Glass (for surfaces made of glass, created by the RF-GLASS add-on module)
  • Laminate (laminate theory, created by the RF-LAMINATE add-on module)
  • Rigid (surfaces with very high stiffness)
  • Membrane (surfaces with membrane stiffnesses only)
  • Membrane - Orthotropic (different membrane stiffnesses in the x- and y-direction of finite elements)
  • Null (surfaces will be ignored in the calculation, necessary for solids)