REVOLUTE

Connection type REVOLUTE provides a connection between two nodes where the rotations are constrained about two local directions and free about a shared axis. The shared axis of rotation is the connector local 1-direction. Connection type REVOLUTE cannot be used in two-dimensional or axisymmetric analysis.

Connection type REVOLUTE models the rotational part of a HINGE or CYLINDRICAL joint.

Related Topics
Connector elements
Connector element library
In Other Guides
*CONNECTOR BEHAVIOR
*CONNECTOR SECTION

ProductsAbaqus/StandardAbaqus/ExplicitAbaqus/CAE

Description

Figure 1. Connection type REVOLUTE.

A REVOLUTE connection constrains two rotational components of relative motion between two nodes and allows one free rotational component. The two kinematic constraints imposed by the REVOLUTE connection are

e1ae2b=0    and    e1ae3b=0,

which are equivalent to the requirement that e1a=e1b. Alternatively, the REVOLUTE constraint is equivalent to setting the second and third Cardan angles to zero in a CARDAN connection. If the shared axes e1a and e1b do not align initially, the REVOLUTE constraint will hold the second and third Cardan angles fixed at their initial values. The constraint moment in the REVOLUTE connection is

m¯=m2e2a+m3e3a.

Node b can rotate about the shared local direction e1a=e1b. The relative angular position of the local directions at node b relative to a is

α=-tan-1(e2ae3be3ae3b),

where α is the first Cardan angle measuring a counterclockwise rotation about the e1a-direction of e2a to e2b.

The available component of relative motion, ur1, measures the change in angular position and is defined as

ur1=α-α0+nπ,

where α0 is the initial angular position and n is an integer accounting for multiple rotations about the shared axis. The connector constitutive rotation is

ur1mat=α-θ1ref+nπ.

The kinetic moment in the REVOLUTE connection is

mrevolute=m1e1a.

Friction

When used by itself, there is no predefined Coulomb-like friction in the REVOLUTE connection. However, when the REVOLUTE connection is used in combination with a JOIN, SLIDE-PLANE, or SLOT connection, the predefined friction is the same as the HINGE, PLANAR, and CYLINDRICAL connections, respectively.

Summary

REVOLUTE
Basic, assembled, or complex: Basic
Kinematic constraints: e1ae2b=0,e1ae3b=0
Constraint moment output: m2,m3
Available components: ur1
Kinetic moment output: m1
Orientation at a: Required
Orientation at b: Optional
Connector stops: θ1minαθ1max
Constitutive reference angles: θ1ref
Predefined friction parameters: None
Contact moment for predefined friction: None