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Tension Crack
A Tension Crack can be included in the Swedge analysis, by selecting the Tension Crack checkbox in the Input Data dialog, and defining the Tension Crack orientation and location method. A Tension Crack is optional in the Swedge analysis. By default, Swedge does NOT consider a Tension Crack in the analysis.
Tension crack option in Input Data dialog
A Tension Crack in Swedge has zero shear strength. It does NOT contribute to the forces resisting wedge movement. It simply truncates the size of the wedge.
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Tension Crack: Orientation
The Tension Crack orientation is defined by entering the Dip and Dip Direction of the Tension Crack plane in the Input Data dialog. NOTE:
The Tension Crack does NOT have to be vertical. Swedge allows you to
enter any orientation for the Tension Crack plane.
However, if a Tension Crack is defined, Swedge examines how the
Tension Crack intersects the other planes, and only accepts those cases
where the Tension Crack truncates the wedge similar to the figure
below (see plane #5).
Definition of Tension Crack for Swedge analysis (plane # 5)
In a Probabilistic Analysis, the Tension Crack Orientation can be defined as a random variable.
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Tension Crack: Location
There are THREE possible methods of defining the location of the Tension Crack.
Tension Crack Location options
Minimum FS Location - Swedge will automatically determine the location
of the Tension Crack which results in the minimum factor of safety for the
wedge.
Specify Location - the location of the Tension Crack can be user-defined
by entering a Trace Length with respect to Joint 1.
Use Bench Width to Maximize - Swedge will automatically locate the
Tension Crack to create the maximum possible wedge size for the
specified Bench Width, as shown in the following figure.
Tension Crack location determined by Bench Width
For more information see the Tension Crack topic in the Swedge help system.
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