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How are the elements of a rigid body accounted for?
Contributions to a rigid body from mass, rotary inertia, and heat capacitance elements are accounted for automatically when these elements are connected to nodes that are part of the rigid body. A list of nodes that are part of a rigid body is generated automatically when you assign elements to a rigid body.
Lecture III: Rigid-Body Physics 2 Rigid-Body Motion •Previously: Point dimensionlessobjects moving through a trajectory. •Today: Objects with dimensions, moving as one piece. 3 Rigid-Body Kinematics •Objects as sets of points. •Relative distances between all points are invariantto rigid movement.
When is the rigid body not constrained fully?
When a rigid body is not constrained fully, the mass and inertia properties of the rigid body are important to its dynamic response. In Abaqus/Explicit an error message will be issued if there is no mass (or rotary inertia) corresponding to an unconstrained degree of freedom.
How does a rigid body interact with the model?
Rigid bodies interact with the remainder of the model in several ways. Rigid bodies can connect at the nodes to deformable elements, and surfaces defined on rigid bodies can continue on these deformable elements, provided that compatible element types are used.
When is the rigid body rotation not transmitted?
When the common nodes are pin nodes, the rigid body rotation is not transmitted directly to the shell elements, which can result in large relative motions between the rigid body and the adjacent shell structure.
When to apply boundary conditions to a rigid body?
In many problems of rigid body dynamics, it may be desirable to apply loads and boundary conditions to the rigid body at its center of mass. In addition, it may be useful to monitor the configuration of the rigid body at its center of mass for output purposes.
Where is the mass element in the rigid body?
The MASS element is then repositioned at the center of mass and included in the mass properties of the rigid body. If the only mass contribution to the rigid body is from a MASS element defined at the rigid body reference node, the reference node will not be repositioned.
Can a analytical surface be part of a rigid body?
Analytical surfaces can also be made part of the rigid body, whereas any surfaces based on the nodes or elements of a rigid body are associated automatically with the rigid body. The motion of a rigid body can be prescribed by applying boundary conditions at the rigid body reference node.