×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

harmonic analysis failure

harmonic analysis failure

harmonic analysis failure

(OP)
hi to all,

i´m trying to model a plate with ribs (a real constant for plate and another one for the ribs because of different thicknesses) and do a harmonic analysis at the eigenfrequencies by using shell elements. i have 2 problems.

1)when i model the ribs on the plate i can´t define an element table on the GUI or when i try to do that with APDL i get zero deformation. my written code looks like that partially:

/PREP7

K,1,0,0,0
K,2,a,0,0
K,3,a,b,0
K,4,0,b,0
K,5,0,0.300,z1
K,6,0.200,0,z1
K,7,0.650,0.300,z1
K,8,0.200,0.900,z1
K,9,0,0.300,0
K,10,0.200,0,0
K,11,0.650,0.300,0
K,12,0.200,0.900,0

LSTR,1,2
LSTR,2,3
LSTR,3,4
LSTR,4,1
LSTR,5,7
LSTR,6,8
LSTR,5,9
LSTR,6,10
LSTR,7,11
LSTR,8,12
LSTR,9,11
LSTR,10,12

AL,1,2,3,4
AL,9,11,7,5
AL,10,12,8,6

MPTEMP,,,,,,,,
MPTEMP,1,0
MPDATA,EX,1,,E
MPDATA,PRXY,1,,mue
MPDATA,DENS,1,,rho

ET,1,SHELL93
R,1,d1, , , , , ,

KEYOPT,1,5,1
KEYOPT,1,8,2

ASEL,S,AREA,,1
Esize,divisor1
AMESH,1
CM,Platte,ELEM

ET,2,SHELL93
R,2,d2, , , , , ,
KEYOPT,1,5,1
KEYOPT,1,8,2

TYPE, 1
MAT, 1
REAL, 2
ESYS, 0

ASEL,S,AREA,,2
Esize,divisor2
AMESH,2,3
CM,Rippe1,ELEM

ASEL,S,AREA,,3
Esize,divisor2
AMESH,2,3
CM,Rippe2,ELEM

NUMMRG,NODE
NUMMRG,ELEM
NUMMRG,KP
NUMMRG,MAT
NUMMRG,TYPE
NUMMRG,CP
NUMMRG,CE

/SOLU

LSEL,S,LINE,,1,4
DL,ALL, ,UX,
DL,ALL, ,UY,
DL,ALL, ,UZ,

*DO,q,1,efmax,1

F,309,FZ,1

ANTYPE,3

HROPT,FULL
HROUT,ON
LUMPM,0

EQSLV,FRONT,0,
PSTRES,0

HARFRQ,Frequenz(q),Frequenz(q),
NSUBST,1,
KBC,0

ALPHAD,0,
BETAD,0,
DMPRAT,eta,
OUTRES,all,all

/STATUS,SOLU
SOLVE

*ENDDO
/POST1

SET,,,,0,,
ETABLE,Uz_real,U,Z

SET,,,,1,,
ETABLE,Uz_imag,U,Z

2)Lastly is it possible to select the displacements of elements on different areas, in this case 2 ribs ( displacements in x and y direction) and the plate (displacement in z direction) and do some mathematical operations?

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources