RROD

Bulk Data Entry

RROD – Rigid Pin-Ended Rod

Description

Defines a pin-ended rod that is rigid in extension.

Format

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
RROD	EID	GA	GB	CMA	CMB	ALPHA

(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)	(9)	(10)
RROD	14	1	1115	2		1.45e-5

Field	Contents
EID	Unique element identification number. Must be unique.
GA,GB	Grid point identification numbers of connection points. (Integer > 0 or <PartName.number>) See comment 5.
CMA,CMB	Component number of one and only one dependent translational degree-of-freedom in the global coordinate system assigned by you to either GA or GB. Integer equal to 1, 2, or 3, or blank. Either CMA or CMB must contain the integer and the other must be blank.
ALPHA	Thermal expansion coefficient (see comment 6) (Real > 0.0 or blank)

Comments

1.	Forces of constraint are not recovered.

2.	The degree-of-freedom selected to be dependent must have a non-zero component along the axis of the rod. This implies that the rod must have finite length.

3.	The degree-of-freedom declared dependent on this entry may not be:

•	Included in a single point constraint (SPC or SPC1)

•	Declared a dependent degree-of-freedom on any other RBAR, RBE1, RBE2, RBE3, or RROD entry

•	Declared a dependent degree-of-freedom on an MPC set referenced by a subcase

4.	Rigid elements are ignored in heat transfer analysis.

Supported local entries in specific parts can be referenced by the use of “fully qualified references” on RROD entries in the model. A fully qualified reference (“PartName.number”) is similar to the format of a numeric reference. “PartName” is the name of the part that contains the referenced local entry (part names are defined on the BEGIN Bulk Data Entry in the model). “number” is the identification number of a referenced local entry in the part “PartName”. See Parts and Instances in the User’s Guide for detailed information on the use of fully qualified references.

The thermal expansion effect will be computed, if you supply the thermal expansion coefficient ALPHA, and the thermal load is requested by the TEMPERATURE(INITIAL) and TEMPERATURE(LOAD) subcase information entries. The temperature of the element is taken to be the average of the temperatures at all the nodes of the element.

7.	This card is represented as a rod element in HyperMesh.