Post-Processing Rods and Pipes Post-Processing Rods and Pipes

When a system contains either rod elements or a pipe assembly, commands are available to obtain additional information about the behavior of the rod elements involved. Here, one can look at the configuration of the rod, the forces in the rod, and the stresses and utilization in the rod. If one is interested in a pipe, the value of ROD_NAME discussed below should be &PIPE, otherwise, it should be the name of the rod for which information is desired. At the conclusion of the command, the user will be placed in the Disposition Menu to dispose of the data as he wishes. All of these commands have a common option:


     -EVENTS, E_BEG, E_END, E_INC

Here, E_BEG and E_END are the beginning and ending event numbers for which the results will be computed, and E_INC is an event increment.

The corresponding form of the REPORT command is:

     REPORT, REP_NAMES(1), REP_NAME(2),  ... -OPTIONS

Here, REP_NAMES(i) is a set of report names which may be selected and will depend on the command issued. If no REP_NAMEs are supplied, all reports will be printed. The only option available for reporting is -EVENTS

The first of these commands,


     R_DETAIL, ROD_NAME, -OPTIONS

allows one to look at the situation at all points in the rod at a single event, EVENT_NUMBER defined by the option


     -EVENTS, EVENT_NUMBER

and the valid REP_NAMES(i) must be either FORCE or STRESS. The command


     R_ENVELOPE, ROD_NAME, -OPTIONS

yields the minimum and maximum values at all points in the rod over all events selected by the option


     -EVENTS, E_BEG, E_END, E_INC

and the valid REP_NAMES(i) must be either FORCE, STRESS, or LOCATION.

Finally, the command


     R_VIEW, ROD_NAME, -OPTIONS

gives the maximum absolute values of the values over the points in the rod as a function of time. The available option is


     -EVENTS, E_BEG, E_END, E_INC

and the valid REP_NAMES(i) must be either FORCE, STRESS, or LOCATION.

Most of the quantities are self explanatory, except with stresses. Here, you get the normal axial, bending, torsion, and shear stresses. Also, you get a column for the maximum axial normal force. This is just the combination of the axial and bending at the extreme fibers. Finally there are three utilization ratios: the maximum normal stress divided by the yield stress, the Von Mises stress divided by the yield stress, and a code check of the interaction of hoop stress with normal stress according to RP2A working stress edition.