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


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)


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


Field Contents SI Unit Example
EID Unique element identification number. Must be unique.  
GA,GB Grid point identification numbers of connection points.

(Integer > 0 or <PartName.number>) 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. 6

(Real ≥ 0.0 or blank)



  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.
  5. 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.numberf) 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 Guide for detailed information on the use of fully-qualified references.
  6. 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.