TAGGED: apdl, mechanical


July 31, 2023 at 2:39 pm567Subscriber
this are apdl commandsï¼š
finish
/clear
/PREP7/NUMBER,1
/VIEW,1,1,1,1
/ANG,1ET,1,BEAM188 ! BEAM
SECTYPE,1,BEAM,CSOLID
SECDATA,0.005
MP,EX ,1,6.9E10
MP,PRXY,1,0.3
MP,DENS,1,2700zl=1
N,1,1*zl,0,0
N,2,0,0,0TYPE,1
secnum,1
MAT,1
E,1,2/SOLU
ANTYPE,2
MODOPT,LANB,10
MXPAND,10,,,0
SOLVE/AUX2
FILE,file,full
HBMAT,stiff,txt,,ascii,stiff,yes,yes
HBMAT,mass,txt,,ascii,mass,yes,yesThe exported stiffness matrix is shown in the following diagramï¼š
ansysstiffnessï¼š
The stiffness matrix is calculated asÂ
The calculation result of ansysstiffness(2,2) does not match the formula
i do not know why!
thank you very much;
Â

August 1, 2023 at 2:36 pmmrifeAnsys Employee
Hi 567
Here is a hint: what beam theory does MAPDL use and is it the same as what you are comparing to....?Â Â
MAPDL beams are based on Timoshenko beam theory.Â Whereas the stiffness matrix shown is based on EulerBernoulli beam theory.Â Timoshenko accounts for shear deformation and rotary inertia effect (that EB does not), but the resulting beam stiffness is slightly lower than EB theory.Â Â
Mike

 The topic ‘the stiffness matrix of a beam element do not match with the computed result’ is closed to new replies.
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