`zone.plane.traction`

Syntax

- v := zone.plane.traction(z,vdir<,arr>)
Get the traction on the zone in the place normal to vdir.

If arr is given, it is filled with the normal and shear stress on the plane normal to vdir. arr(1) is the normal stress, arr(2) is the maximum shear stress, and arr(3) through arr(5) are the (\(x\), \(y\), \(z\)) components of the maximum shear stress direction.

Returns: v - the traction on the zone in the plane

Arguments: z - a pointer to a zone

vdir - the direction normal to the plane

arr - an optional pointer to an array, which is filled with the normal, shear, and shear directions

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