The Modal/Buckling Elasticity Analysis module provides a solver and post-processing functionalities for modal analysis and bifurcation (eigenvalue) buckling. Modal and buckling analyses can be performed for both 2D planar problems (plates and beam elements) and 3D problems (shell, extrude and solid elements).

• Modal analysis supports computation of natural frequencies and their associated mode shapes.
  • Mass density may be defined as a constant or as a formula
  • Mode shapes can be constrained or unconstrained, in which the first six shapes are rigid body modes
  • Can specify a pre-stress for 3D problems to account for initial stress conditions
• Buckling analysis supports computation of buckling load factors and their associated buckling mode shapes. Both standard and pre-load buckling options are incorporated.
  • Standard buckling provides a buckling load factor for a given loading condition
  • Pre-load buckling takes into account an additional fixed set of loads (for example, residual stresses) when reporting the buckling factor for applied loads

• StressCheck's high-order elements minimize detrimental locking effects on the eigenvalue solution and promote proper simulation of mode shapes
• The element formulation permits rapid transitions from thin to thick domains
  • In many cases only one element is needed through a part thickness
• Convergence information for natural frequencies and buckling load factors is reported
  • No limit on number of eigenvalues to be computed
• StressCheck Handbook simplifies boundary condition influence on buckling load factor and mode shapes by allowing users to switch between support types