Mechanical APDL Basic Analysis Guide - Ansys

Chapter 2: Loading
Figure 2.16 Concentrated Axisymmetric Loads
Defined on a 360° basis
2.5.11.1. Hints and Restrictions
Specify a sufficient number of constraints to prevent unwanted rigid-body motions, discontinuities, or singularities.
For example, for an axisymmetric model of a solid structure such as a solid bar, a lack of UX constraint
along the axis of symmetry can potentially allow spurious "voids" to form in a structural analysis. (See
Figure 2.17 (p. 48).)
Figure 2.17 Central Constraint for Solid Axisymmetric Structure
2.5.12. Loads to Which the Degree of Freedom Offers No Resistance
If an applied load acts on a degree of freedom which offers no resistance to it (that is, perfectly zero stiffness),
the program ignores the load.
2.5.13. Initial State Loading
You can specify initial state as a loading parameter for a structural analysis in ANSYS. Initial state loading is
valid for static or full transient analyses (either linear or nonlinear), and for modal, buckling and harmonic
analyses. Initial state must be applied in the first load step of an analysis.
Initial state is also available in Distributed ANSYS.
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