!!!FEA ST3: BUCKLING ANALYSIS OF A RECTANGULAR PLATE

!!Initial setup

! White canvas
/RGB/RGB, Kywrd, PRED, PGRN, PBLU, N1, N2, NINC, NCNTR Specifies the RGB color values for indices and contours.,INDEX,100,100,100,0
/RGB/RGB, Kywrd, PRED, PGRN, PBLU, N1, N2, NINC, NCNTR Specifies the RGB color values for indices and contours.,INDEX,0,0,0,15
! Define constant parameters
! [N],[Nmm],[N/mm^2=MPa],[N/mm]
ELAST=2E5
NU=0.3
A=1000
B=300
T=3

!!SETUP: element types, materials, sections

KEYWKEYW, Keyword, KEY Sets a keyword used by the GUI for context filtering (GUI).,PR_STRUC,1! Preferences / Structural
/PREP7/PREP7 Enters the model creation preprocessor.
ETET, ITYPE, Ename, KOP1, KOP2, KOP3, KOP4, KOP5, KOP6, INOPR Defines a local element type from the element library.,1,SHELL181

!
MPTEMPMPTEMP, SLOC, T1, T2, T3, T4, T5, T6 Defines a temperature table for material properties.
MPTEMPMPTEMP, SLOC, T1, T2, T3, T4, T5, T6 Defines a temperature table for material properties.,1,0
MPDATAMPDATA, Lab, MAT, SLOC, C1, C2, C3, C4, C5, C6 Defines property data to be associated with the temperature table.,EX,1,,ELASTELAST = 2E5
MPDATAMPDATA, Lab, MAT, SLOC, C1, C2, C3, C4, C5, C6 Defines property data to be associated with the temperature table.,PRXY,1,,NUNU = 0.3
!
SECTSECTYPE, SECID, Type, Subtype, Name, REFINEKEY Associates section type information with a section ID number.,1,SHELL,
SECDATASECDATA, VAL1, VAL2, VAL3, VAL4, VAL5, VAL6, VAL7, VAL8, VAL9, VAL10, VAL11, VAL12 Describes the geometry of a section.,TT = 3,1,0.0,3
SECOFFSETSECOFFSET, Location, OFFSET1, OFFSET2, CG-Y, CG-Z, SH-Y, SH-Z Defines the section offset for cross sections.,MID
SECCONTROLSECCONTROL, VAL1, VAL2, VAL3, VAL4, VAL5, VAL6, VAL7, VAL8, VAL9, VAL10, VAL11, VAL12, VAL13 Supplements or overrides default section properties.
!
BLC4BLC4, XCORNER, YCORNER, WIDTH, HEIGHT, DEPTH Creates a rectangular area or block volume by corner points.,0,0,AA = 1000,BB = 300
!
LESIZELESIZE, NL1, SIZE, ANGSIZ, NDIV, SPACE, KFORC, LAYER1, LAYER2, KYNDIV Specifies the divisions and spacing ratio on unmeshed lines.,1,,,20
LESIZELESIZE, NL1, SIZE, ANGSIZ, NDIV, SPACE, KFORC, LAYER1, LAYER2, KYNDIV Specifies the divisions and spacing ratio on unmeshed lines.,3,,,20
LESIZELESIZE, NL1, SIZE, ANGSIZ, NDIV, SPACE, KFORC, LAYER1, LAYER2, KYNDIV Specifies the divisions and spacing ratio on unmeshed lines.,2,,,5
LESIZELESIZE, NL1, SIZE, ANGSIZ, NDIV, SPACE, KFORC, LAYER1, LAYER2, KYNDIV Specifies the divisions and spacing ratio on unmeshed lines.,4,,,5
! Mesh the area using mapped meshing algorithm
MSHKEYMSHKEY, KEY Specifies whether free meshing or mapped meshing should be used to mesh a model.,1
AMESHAMESH, NA1, NA2, NINC Generates nodes and area elements within areas.,ALL
! Define the kinematic constraints on lines
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,4,,UX,0
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,4,,UZ,0
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,4,,ROTZ,0
!
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,1,,UY,0
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,1,,UZ,0
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,1,,ROTZ,0
!
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,3,,UY,0
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,3,,UZ,0
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,3,,ROTZ,0
!
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,2,,UZ,0
DLDL, LINE, AREA, Lab, Value1, Value2 Defines DOF constraints on lines.,2,,ROTZ,0
! Define loading on surface
SFLSFL, Line, Lab, VALI, VALJ, VAL2I, VAL2J Specifies surface loads on lines of an area.,2,PRES,1
FINISHFINISH Exits normally from a processor.
!
! Calculate prestress effect
/SOL/SOLU Enters the solution processor.
PSTRESPSTRES, Key Specifies whether prestress effects are calculated or included.,1
/STATUS/STATUS, Lab Lists the status of items for the run.,SOLU
SOLVESOLVE, Action Starts a solution.
FINISHFINISH Exits normally from a processor.
!
! Solve the eigen buckling analysis
/SOL/SOLU Enters the solution processor.
ANTYPEANTYPE, Antype, Status, LDSTEP, SUBSTEP, Action Specifies the analysis type and restart status.,1
! Extract the first four modes
BUCOPTBUCOPT, Method, NMODE, SHIFT, LDMULTE, RangeKey Specifies buckling analysis options.,LANB,4,0,0,CENTER
MXPANDMXPAND, NMODE, FREQB, FREQE, Elcalc, SIGNIF, MSUPkey, ModeSelMethod Specifies the number of modes to expand and write for a modal or buckling analysis.,4,0,0,0,0.001,
/STATUS/STATUS, Lab Lists the status of items for the run.,SOLU
SOLVESOLVE, Action Starts a solution.
! Postprocessing
/POST1/POST1 Enters the database results postprocessor.
SETSET, Lstep, Sbstep, Fact, KIMG, TIME, ANGLE, NSET, ORDER Defines the data set to be read from the results file.,FIRST
! Export the eigenshapes as bmp files
*DO*DO, Par, IVAL, FVAL, INC Defines the beginning of a do-loop.,III,1,4,1
  PLNSOLPLNSOL, Item, Comp, KUND, Fact, FileID Displays results as continuous contours.,U,SUM,1,1.0
  /IMAGE/IMAGE, Label, Fname, Ext, -- Allows graphics data to be captured and saved.,SAVE,strcat(chrval(III),'_ST3'),bmp
  SETSET, Lstep, Sbstep, Fact, KIMG, TIME, ANGLE, NSET, ORDER Defines the data set to be read from the results file.,NEXT
*ENDDO*ENDDO Ends a do-loop and starts the looping action.