How dose LS-DYNA output body rotational information in Global coordinate system?

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Vilayat Ali

LS-DYNA can output body rotational information in the global coordinate system in several ways, depending on the type of analysis being performed and the user's preferences. The following are some of the common methods:

NCF (nodal constraint forces) output: This method outputs nodal forces and moments, which can be used to determine the rotational motion of the body. The nodal forces and moments are output in the global coordinate system.

NCFROT (nodal constraint forces and rotations) output: This method outputs both nodal forces and moments and the corresponding nodal rotational displacements. The nodal forces, moments, and rotations are output in the global coordinate system.

ELEMENT STRAIN output: This method outputs the element strain tensor, which can be used to determine the deformation and rotational motion of the body. The element strain tensor is output in the local coordinate system, so it must be transformed to the global coordinate system using the appropriate transformation matrix.

History output: LS-DYNA can output history data for various quantities, such as nodal velocities, accelerations, and displacements. These quantities can be used to determine the rotational motion of the body. The history data is output in the global coordinate system.

It is important to note that LS-DYNA provides various options for outputting rotational information in the global coordinate system, and the most appropriate method depends on the specific requirements of the analysis. Additionally, it is recommended to consult with an experienced LS-DYNA user or licensed engineer to ensure that the rotational information is being output correctly and is being used appropriately in the analysis.

Wei Wei

You can define a rigid body to output the rigid body information (rbout file) which includes linear and rotational information.