In a sequential thermal - structural (ETCHG,TTS) analysis, can I add structural elements after using LDREAD to apply the temperatures from the thermal analysis?


Yes, the following example demonstrates:

!***** First perform thermal analysis
fini
/clear
/filn,thermal_structural
/view,1,.5,1,.5
/eshape,1
/prep7
mp,ex,1,30e6 !Material Properties
mp,nuxy,1,0.3
mp,alpx,1,9.8e-06
mp,kxx,1,0.025
mp,c,1,0.28
mp,dens,1,0.054
et,1,solid90 !Thermal Solid Element
blc4,0,0,10,10,10
esiz,2
vmesh,1
asel,s,area,,1,5,1
sfa,all,,conv,0.014,100 !Apply Convection
alls
asel,s,area,,6
nsla,s,1
d,all,temp,50 !Apply Temperatures
alls
/solu
solve !Solve thermal analysis to produce *.rth file

!***** Now perform structural analysis
/prep7
etch,tts !Change to compatible Stuctural element, SOLID95
!*** Use LDREAD to apply temperatures from thermal analysis ***
!*** as Body Force temperatures in structural analysis ***
ldread,temp,,,,,thermal_structural,rth
et,2,beam188 !Add new structural elements
sectype,1,beam,I,,0
secdata,0.5,0.5,0.5,0.1,0.1,0.1
type,2
n,1000,5,5,20
e,1000,node(0,0,10)
e,1000,node(10,0,10)
e,1000,node(0,10,10)
e,1000,node(10,10,10)
eplo
d,1000,all !Fix end of beams
/solu
solve !Solve structural analysis
/post1
plns,u,sum !Plot displacements





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