My HYPER56 model matches my PLANE182 model for principal stress directions,
but the principal strain directions are different (and seem wrong). Is this a bug?


Yes, Defect 22500 was filed and corrected in the BETAUP20040609 build of 9.0.
The input below demonstrates the error in the HYPER56 principal strain directions.


finish
/clear
/plopts,info,1

/prep7
et,1,182,2,,2
tb,hyper,1,,2,mooney
tbdata,1,0.241,0.488

et,2,56
keyopt,2,5,2
mp,nuxy,2,0.499999
tb,mooney,2
tbdata,1,0.241,0.488

rect,,30,,1
aatt,1,1,1
asel,none

rect,,30,5,6
aatt,2,1,2
allsel

esize,0.25
mshkey,1
amesh,all
eplot
finish

/solution
solcon,on
nlgeom,on
time,1
nsubst,1e2,1e5,10
outres,all,all
nsel,s,loc,x,0
d,all,all
nsel,s,loc,x,30
d,all,uy,-15
allsel
solve
save
finish

/post1
set,last
/graph,full
/dscale,,1
/edge,,1
/dist,,4
/focus,,9,0
/vscale,,0.5,1

/title, Stress plotlooks OK for both HYPER56 and PLANE182 ...
plvect,s,,,,vect,elem,on,1
/wait,3

/title, Strain plot looks wrong for HYPER56 ...
plvect,epto,,,,vect,elem,on,1




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