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Subsection 7.2.1: Pressure Up Section 7.2: Surface Loads Section 7.3: Initial Conditions

### 7.2.2 Traction forces

Traction forces are similar to pressure forces but differ in two regards. First, the force vector is entered directly and does not need to be perpendicular to the surface. Second, the force remains constant and does not change with deformation. Note that a load curve is associated with the traction load amplitude which by default will ramp the amplitude from zero to whatever value you entered.
Subsection 7.2.1: Pressure Up Section 7.2: Surface Loads Section 7.3: Initial Conditions