About the Linearization Basis
The linearization basis is a coordinate system that gives the X-, Y- and Z-directions to calculate the linearized stress for a selected line segment. It appears as a vector triad at the midpoint of the linearization segment.
Use the Basis list on the Linearized Stress Report dialog box to select a method to define the linearization basis:
• Defined by Curvatures—This option is available only if the Point 2 is defined by On Opposite Surface. The linearization basis is defined by the directions of principal curvature of the first surface. In this case, the X-direction is the surface normal, the Y-direction is the direction of maximum curvature and the Z-direction is the direction of minimum curvature.
For 2D models, the Z-direction is normal to the plane of the model, the X-direction is normal to the boundary curve and the Y-direction is perpendicular to X and Z.
• Defined by Stress Values—The default option for flat surfaces (curvature =0) or surfaces with uniform curvature (spherical surfaces). The linearization basis is defined using the YY stress component. In this case X is the direction from point 1 to point 2; Y is the direction perpendicular to X that maximizes the YY stress component at point 1. Z is perpendicular to the X-Y plane.
• Defined by Point—Select a point using the Points Selection collector. The point must not be collinear with the linearization segment. The selected point along with the linearization segment defines the X-Y plane. The X-direction is from Point 1 to Point 2. The Z- and Y-directions are determined by the right hand rule.
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 Linearization basis is not available for 2D models. |