Mechanical APDL Structural Analysis Guide

solve !solve load step 2

!boundary conditions for load step 3

!60° clockwise rotation at node 1 about x-axis (from load step 1)

d,1,rotx,-pi/6.0

!y-component of 90° counterclockwise rotation at node 1 about local z-axis (from load step 2)

!and y-component of 90° counterclockwise rotation at node 1 about local x-axis

d,1,roty,(pi/2.0)*sin(pi/6.0)+(pi/2.0)*cos(pi/6.0)

!z-component of 90° counterclockwise rotation at node 1 about local z-axis (from load step 2)

!and z-component of 90° counterclockwise rotation at node 1 about local x-axis

d,1,rotz,(pi/2.0)*cos(pi/6.0)-(pi/2.0)*sin(pi/6.0)

time,3.0! time at the end of load step 3

nsub,10,100,10

outres,all,all

solve !solve load step 3

finish

/post26 !time-history postprocessor

nsol,2,1,rot,x,rotx1 !store results for rotation about x-axis at node 1

nsol,3,1,rot,y,roty1 !store results for rotation about y-axis at node 1

nsol,4,1,rot,z,rotz1 !store results for rotation about z-axis at node 1

nsol,5,2,u,x,ux2 !store results for x-displacement at node 2

nsol,6,2,u,y,uy2 !store results for y-displacement at node 2

nsol,7,2,u,z,uz2 !store results for z-displacement at node 2

prvar,2,3,4 !print results

prvar,5,6,7

finish

The following input illustrat es compound rotational velocities imposed over multiple load steps with
each component applied sequentially. The difference between imposing rotations and rotational velo-
cities should be noted.

Example 2: Sequentially Applied Rotational Velocities

/prep7

!parameters

pi=3.1415926536

!element type definitions

et,1,188 !beam element

!node definitions

n,1,0.,0.,0.

n,2,0.,0.,0.6

!material properties

mp,ex,1,2.01e11 !young's modulus for steel

mp,nuxy,1,0.3 !poisson's ratio

!section properties

sectype,1,beam,rect

secdata,0.1,0.2 !beam cross-section

!element definitions

type,1

mat,1

real,1

secnum,1

en,1,1,2

finish

/solu !solution

nlgeom,on !geometrically nonlinear analysis

kbc,1 !step applied load/boundary condition

!boundary conditions for load step 1

d,1,ux,0.0 !displacement at node 1 fixed in x-direction

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Sample Inputs for Imposed Rotations