Mechanical APDL Basic Analysis Guide

GUI:

Main Menu> Preprocessor> Loads> Define Loads> Apply> load type> On Nodes

Utility Menu> List> Loads> Forces> On All Keypoints (or On Picked KPs)

Main Menu> Solution> Define Loads> Apply> load type> On Lines

See the Command Reference for descriptions of the commands listed in Table 2.4: Commands for Applying
Force Loads (p. 32).

2.5.6.1. Repeating a Force

By default, if you repeat a force at the same degree of freedom, the new specification replaces the
previous one. You can change this default to add (for accumulation) or ignore by using one of the fol-
lowing:
Command(s):FCUM
GUI: Main Menu> Preprocessor> Loads> Define Loads> Settings> Replace vs Add> Forces
Main Menu> Solution> Define Loads> Settings> Replace vs. Add> Forces

For example:

F,447,FY,3000! Applies FY = 3000 at node 447

F,447,FY,2500! Changes FY value to 2500 (replacement)

FCUM,ADD! Subsequent F's to be added

F,447,FY,-1000! FY = 2500-1000 = 1500 at node 447

FCUM,IGNORE! Subsequent F's to be ignored

F,25,FZ,350! This force is ignored!

FCUM! Resets FCUM to default (replacement)

See the Command Reference for a discussion of the F and FCUM commands.

Any force set via FCUM stays set until another FCUM is issued. T o reset the default setting (replacement),
simply issue FCUM without any arguments.

2.5.6.2. Scaling Force Values

The FSCALE command allows you to scale existing force values:
Command(s):FSCALE
GUI: Main Menu> Preprocessor> Loads> Define Loads> Operate> Scale FE Loads> Forces
Main Menu> Solution> Define Loads> Operate> Scale FE Loads> Forces

FSCALE and FCUM work on all selected nodes and also on all selected force labels. By default, force labels
that are active are those associated with the element types in the model. You can select a subset of
these with the DOFSEL command. For example, to scale only FX values and not any other label, you
can use the following commands:

DOFSEL,S,FX! Selects FX label

FSCALE,0.5! Scales FX at all selected nodes by 0.5

DOFSEL,ALL! Reactivates all DOF labels

2.5.6.3. Transferring Forces

To transfer forces that have been applied to the solid model to the corresponding finite element model,
use one of the following:
Command(s):FTRAN
GUI: Main Menu> Preprocessor> Loads> Define Loads> Operate> Transfer to FE> Forces
Main Menu> Solution> Define Loads> Operate> Transfer to FE> Forces

Release 15.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information

Applying Loads