Mechanical APDL Basic Analysis Guide

Figure 2.24: Pretension Stress

MNMX YX

Z

Sample application of PSMESH - preload only

Pretension

adjustment

UX

We apply constraints for symmetry and to prevent rigid body motion. Note that the uniform temperature
defaults to the reference temperature of 70°F. We apply half the load (this is a half model) to the pre-
tension node created by PSMESH, solve, and plot the normal stress in the axial direction. As we should
expect, the axial stress is tensile in the bolt, and compressive in the portion of the plates compressed
by the bolt heads. (See Figure 2.24: Pretension Stress (p. 70).)

/prep7

et,1,187

mp,ex,1,1e7

mp,alpx,1,1.3e-5

mp,prxy,1,0.30

mp,ex,2,3e7

mp,alpx,2,8.4e-6

mp,prxy,2,0.30

tref,70

/foc,,-.09,.34,.42

/dist,,.99

/ang,,-55.8

/view,,.39,-.87,.31

/pnum,volu,1

/num,1

cylind,0.5,, -0.25,0, 0,180

cylind,0.5,, 1,1.25, 0,180

cylind,0.25,, 0,1, 0,180

wpoff,.05

cylind,0.35,1, 0,0.75, 0,180

wpoff,-.1

cylind,0.35,1, 0.75,1, 0,180

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