{"id":160709,"date":"2021-07-26T16:56:16","date_gmt":"2021-07-26T16:56:16","guid":{"rendered":"\/forum\/forums\/topic\/how-to-create-a-stiffness-matrix-in-apdl\/"},"modified":"2021-08-03T17:20:48","modified_gmt":"2021-08-03T17:20:48","slug":"how-to-create-a-stiffness-matrix-in-apdl","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-create-a-stiffness-matrix-in-apdl\/","title":{"rendered":"How to Create a Stiffness Matrix in APDL"},"content":{"rendered":"
\n
\n

Dear Support Engineers:<\/p>\n

Is it possible that ANSYS APDL can create <\/strong>(or provide<\/strong>) the stiffness matrix? I am not asking to import the existing stiffness matrix. Rather, I want APDL to provide <\/strong>me the stiffness <\/strong>matrix? Is it possible?<\/p>\n

I am using the *DMAT command. How could I let APDL know that I am interested to get the stiffness matrix as an output? Could you please have a look my APDL code as listed below? <\/p>\n

!! Comment<\/p>\n

!! Extracting Stiffness Matrix from ANSYS APDL<\/p>\n

finish      !! It will finish all previous work<\/p>\n

\/clear      !! Clean woking window<\/p>\n

\/title, How to Get Stiffness Matrix?<\/p>\n

\/prep7      !! Enter to pre-processor<\/p>\n

<\/p>\n<\/p>\n

!! Choose a proper element type<\/p>\n

et,1,180   !! et – element type<\/p>\n

A=0.125      !! Area, in^2<\/p>\n

r,1,A      !! r — real consant number<\/p>\n

!! Define material<\/p>\n

mp,ex,1,10e6   !! mp — material properties<\/p>\n

mp,prxy,1,0.3   !! mp — <\/p>\n

!! Make FE Model, make nodes and elements<\/p>\n

L= 10      !! L — length, 10 inch<\/p>\n

n,1      !! n — making nodes<\/p>\n

n,2,L<\/p>\n

\/pnum,node,1   !! p+num — plot numbering<\/p>\n

!! Make elements<\/p>\n

!! Before making elements, we must recall ID #<\/p>\n

type,1      !! type — element type<\/p>\n

real,1      !! real — real constant<\/p>\n

mat,1      !! mat –materials<\/p>\n

e,1,2      !! e — making elements by node by node<\/p>\n

\/pnum,elem,1   !! pnum — plot numbering<\/p>\n

eplot      !! e+plot — element plot<\/p>\n

!! Apply BC – Boundary Conditions<\/p>\n

d,1,all,0   !! d — dof at nodes<\/p>\n

!! Apply force<\/p>\n

f,2,fx,1000   !! f — force at nodes<\/p>\n

alls      !! all select<\/p>\n

fini      !! finish with pre-processor<\/p>\n

<\/p>\n<\/p>\n

\/solution   !! enter solution<\/p>\n

*Dmat,Matkd,D,???<\/strong><\/p>\n

*print,Matkd,K???<\/strong><\/p>\n

solve      !! solve <\/p>\n

fini      !! finish with solutions<\/p>\n

<\/p>\n<\/p>\n

Any suggestions will be highly appreciated. Thanks,<\/p>\n

Awlad.<\/p>\n","protected":false},"template":"","class_list":["post-160709","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t