Spring Behavior—Creo Ansys Simulation
Spring behavior is used to define the following properties of a 1D or 3D spring:
• Spring Type —Defines the extension properties of the spring.
◦ Longitudinal—The spring extends or compresses along the axis and you define the extensional or longitudinal stiffness properties along the three axes. (single axis in the case of 1D springs). Longitudinal stiffness is the stiffness that resists the stretching or compression of the spring.
◦ Torsional —The spring twists or rotates and you define the torsional stiffness properties about the three axes. (single axis in the case of 1D springs).Torsional stiffness is the stiffness that resists twisting or rotating of the spring.
• Applied Preload—Defines whether the spring is preloaded, and the type of preload. By default springs are in an “unloaded” or stress free state.
When you define a spring behavior you can reuse it in multiple springs for a study and it is available for selection in the Spring behavior list.
To Define a Spring Behavior for a 1D Spring
1. Click > > . The Spring Behavior dialog box opens.
2. Select 1D - Spring from the list.
3. Select a Spring type and define the value of stiffness as a positive real number, a parameter, or expression that evaluates to a positive real number.
4. Specify units or accept the default units for longitudinal or torsional stiffness.
5. Optionally, select a preload type depending on the selected spring type:
◦ For longitudinal springs—Select one of the following options or retain the default of None:
▪ Force—Specifies the initial force that the spring is loaded with as a non zero real number, a parameter, or an expression that evaluates to a non-zero real number in the Initial condition box. A positive value denotes extension in the spring while a negative value denotes compression.
▪ Free Length—Specifies the preload as a displacement length that is a positive non-zero real number, a parameter, or an expression that evaluates to a non-zero positive real number.
If the difference between the free-length and the approximate length of the spring is positive it denotes extension of the spring and if the difference is negative it denotes compression of the spring.
◦ For torsional springs—Select one of the following options or retain the default of None:
▪ Torque—Specifies the initial torque that the spring is loaded with as a non zero real number, a parameter, or an expression that evaluates to a non-zero real number in the Initial condition box.
▪ Rotation—Specifies the preload as a rotational displacement (initial twist) as a non-zero real number, a parameter, or an expression that evaluates to a non-zero real number in the Initial condition box.
6. Click OK to create the spring behavior and to save it. The spring behavior is displayed in the Simulation Tree and is the parent node of springs that use it.
To Define a Spring Behavior for a 3D Spring
1. Click > > . The Spring Behavior dialog box opens.
2. Select 3D - Spring from the list.
3. Select a Spring type and define the value of the stiffness along or about the X-, Y- or Z- axes as a positive real number, a parameter, or an expression that evaluates to a positive real number. The value for one or two, but not all axes may be zero.
4. Specify units or accept the default units for longitudinal or torsional stiffness.
5. Click OK to create the spring behavior and to save it. The spring behavior is displayed in the Simulation Tree and is the parent node of springs that use it.