Mechanical APDL Structural Analysis Guide

14.3.3.1.2. Nodal Stresses from Jobname.RST.

When you use this option, you cause a nodal stress vector containing six stress components to be stored
directly from the results database. Stress components stored with this option can be modified with a
subsequent FS command.

Note

You must issue a SET command, and possibly a SHELL command, before executing FSNODE.

SET will read results for a particular load substep from the results file (Jobname.RST) into

the database.SHELL allows you to select results from the top, middle, or bottom surfaces

for shell elements (default is the top surface).

Command(s):FSNODE
GUI: Main Menu> General Postproc> Fatigue> Store Stresses> From rst File

Input by means of FSNODE is demonstrat ed by the following example for an event at one nodal location:

SET,1! Define data set for load step 1

FSNODE,123,1,1! Stress vector at node 123 assigned to event 1,

! loading 1.

SET,2! Define data set for load step 2

FSNODE,123,1,2! ...event 1, loading 2

SET,3! ...load step 3

FSNODE,123,1,3! ...event 1, loading 3

Figure 14.2: Three Loadings in One Event

L.S. 1 L.S.3

str L.S.^2

es

s

im

14.3.3.1.3. Stresses at a Cross-Section

This option calculates and stores total linearized stresses at the ends of a section path (as defined by
a preceding PATH and PPATH command). Because you will normally want the linearization to take
place over a thickness representing the shortest distance between the two surfaces, use only the two
surface nodes to describe the path in the PPATH command. This option retrieves stress information
from the results database; therefore FSSECT must also be preceded by a SET command. Stress compon-
ents stored with an FSSECT command can be modified with a subsequent FS command.
Command(s):FSSECT
GUI: Main Menu> General Postproc> Fatigue> Store Stresses> At Cross Sect

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Fatigue