Stress Linearization

Use the node to define a line (stress classification line; SCL) along which a linearization of the stress state will be made. A number of result variables are created for each SCL. Add one node for each SCL along which you want to compute linearized stresses.

	A Stress Linearization node will not affect the solution, unless you manually have coupled any of its variables to other equations. This means that when a Stress Linearization node has been added or modified, you do not need to compute a new solution. It is sufficient to perform an Update Solution () to make the variables for the new SCL available.

The node is only available with some COMSOL products (see https://www.comsol.com/products/specifications/).

Select what of linearization to use — or . For , the stress is linearized along a single predefined SCL, whereas for , the stress is linearized in a domain. The direction of the SCL is in the distributed case given by the normal of the selected boundaries from which it originates. In principle, an infinite number of SCLs are created in the domain.

When is selected, the SCL can either be defined by a set of edges or by two points. Control this by setting to either or .

If the SCL is defined by , the selection can consist of several edges, but they are assumed to form a straight line from one free boundary to another.

If the SCL is defined by , you can either choose to use geometrical points or arbitrary coordinates within the solid to define the endpoints of the SCL. An SCL is created by connecting the two points with a straight line. To control how to specify the endpoints, select either or in the and lists.

•

For , select a point in or .

When is chosen, select entities in from which the distributed SCLs start. The SCLs are then created along the normal to the selected boundaries, and extends through the entities selected in .

For 2D and 2D Axisymmetric geometries, no more inputs are need to define the SCL. For 3D, you also need to specify the orientation of the local coordinate system in which the linearized stresses are represented.

This section is present only in 3D. Here you specify the orientation of the local coordinate system in which the components of the linearized stress tensor are represented. The first direction is always along the SCL, and you indicate the second direction. The third direction is automatically formed by being orthogonal to the SCL and the second direction.

For the linearization type, select or . When a reference point is used, the second local direction will be in the plane formed by the SCL and the selected point. When an orientation vector is used, the second local direction will be directed in the plane formed by the SCL and the selected orientation. The orientation is always adjusted so that it is orthogonal to the SCL.

•

For , select — or . When is used, select the reference point in the section. When is used, enter the coordinates for the reference point in the table.

•

For select — or . When is used, select an edge in the geometry as orientation vector in the section. When is used, enter the orientation vector manually in the table.

For the linearization type, select a boundary system from the list. The second direction of the SCL is always taken as the first tangent vector of the selected boundary system.

This section is only present for the linearization type. Enter the coordinates for the starting point of a SCL; it must be part of the selected boundaries. The specified point is used to create a dataset to postprocess a single SCL that extends from the point through the selected domains.