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1、* PROGRAM CST * CONSTANT STRAIN TRIANGLE * T.R.Chandrupatla and A.D.Belegundu *DefInt I-NDefDbl A-H, O-ZDim NN, NE, NM, NDIM, NEN, NDNDim ND, NL, NPR, NMPC, NBWDim X(), NOC(), MAT(), PM()Dim TH(), DT(), NU(), U(), F(), MPC(), BT()Dim D(), B(), DB(), SE(), Q(), STR(), TL(), S()Dim Stress(), React(),
2、PrinStress(), PltStress()Dim CNST, LC, IPL, NQ, DJDim File1 As String, File2 As String, File3 As StringDim Title As String, Dummy As StringPrivate Sub cmdEnd_Click()EndEnd SubPrivate Sub cmdStart_Click()Call InputDataCall BandwidthCall StiffnessCall ModifyForBCCall BandSolverCall StressCalcCall Reac
3、tionCalcCall OutputcmdView.Enabled = TruecmdStart.Enabled = FalseEnd SubPrivate Sub InputData()Dim msg As String, File1 As StringFile1 = InputBox(Input File d:dirfileName.ext, Name of File)msg = 1. Plane Stress Analysis & Chr(13)msg = msg + 2. Plane Strain Analysis & Chr(13)msg = msg + Your Choice ?
4、LC = InputBox(msg, Type of Problem, 1)NPR = 3 Material Properties E, Nu, Alphamsg = 1) No Plot Data & Chr(13)msg = msg + 2) Create Data File for in-plane Shear Stress & Chr(13)msg = msg + 3) Create Data File for Von Mises Stress & Chr(13)msg = msg + Choose 1 or 2 or 3IPL = InputBox(msg, Plot Choice,
5、 1)Open File1 For Input As #1Line Input #1, Dummy: Input #1, TitleLine Input #1, Dummy: Input #1, NN, NE, NM, NDIM, NEN, NDNLine Input #1, Dummy: Input #1, ND, NL, NMPC- Total dof is NQNQ = NDN * NNReDim X(NN, NDIM), NOC(NE, NEN), MAT(NE), PM(NM, NPR)ReDim TH(NE), DT(NE), NU(ND), U(ND), F(NQ), MPC(N
6、MPC, 2), BT(NMPC, 3)ReDim D(3, 3), B(3, 6), DB(3, 6), SE(6, 6), Q(6), STR(3), TL(6)= READ DATA =- CoordinatesLine Input #1, DummyFor I = 1 To NNInput #1, NFor J = 1 To NDIMInput #1, X(N, J)Next JNext I - Connectivity, Material, Thickness, Temp-changeLine Input #1, DummyFor I = 1 To NEInput #1, NFor
7、J = 1 To NENInput #1, NOC(N, J)Next JInput #1, MAT(N), TH(N), DT(N)Next I- Displacement BCLine Input #1, DummyFor I = 1 To NDInput #1, NU(I), U(I)Next I- Component LoadsLine Input #1, DummyFor I = 1 To NLInput #1, NInput #1, F(N)Next I- Material PropertiesLine Input #1, DummyFor I = 1 To NMInput #1,
8、 NFor J = 1 To NPRInput #1, PM(N, J)Next JNext IIf NMPC 0 Then- Multi-point ConstraintsLine Input #1, Dummy For I = 1 To NMPCInput #1, BT(I, 1), MPC(I, 1), BT(I, 2), MPC(I, 2), BT(I, 3)Next IEnd IfClose #1End SubPrivate Sub Bandwidth()- Bandwidth Evaluation -For I = 1 To NENMIN = NOC(I, 1): NMAX = N
9、OC(I, 1)For J = 2 To 3If NMIN NOC(I, J) Then NMIN = NOC(I, J)If NMAX 0 ThenS(NR, NC) = S(NR, NC) + SE(I, J)End IfNext JTNext JJF(NR) = F(NR) + TL(I) Next ITNext IINext NEnd SubPrivate Sub ModifyForBC()- Decide Penalty Parameter CNST -CNST = 0For I = 1 To NQIf CNST I2 Then IR = I2IC = Abs(I2 - I1) +
10、1S(IR, IC) = S(IR, IC) + CNST * BT(I, 1) * BT(I, 2)F(I1) = F(I1) + CNST * BT(I, 1) * BT(I, 3)F(I2) = F(I2) + CNST * BT(I, 2) * BT(I, 3)Next IEnd SubPrivate Sub BandSolver() - Band Solver -N1 = NQ - 1- Forward EliminationFor K = 1 To N1NK = NQ - K + 1If NK NBW Then NK = NBWFor I = 2 To NKC1 = S(K, I)
11、 / S(K, 1)I1 = K + I - 1For J = I To NKJ1 = J - I + 1S(I1, J1) = S(I1, J1) - C1 * S(K, J)Next JF(I1) = F(I1) - C1 * F(K)Next INext K- Back-substitutionF(NQ) = F(NQ) / S(NQ, 1)For KK = 1 To N1K = NQ - KKC1 = 1 / S(K, 1)F(K) = C1 * F(K)NK = NQ - K + 1If NK NBW Then NK = NBWFor J = 2 To NKF(K) = F(K) -
12、 C1 * S(K, J) * F(K + J - 1)Next JNext KKEnd SubPrivate Sub StressCalc()ReDim Stress(NE, 3), PrinStress(NE, 3), PltStress(NE) - Stress CalculationsFor N = 1 To NECall DbMat(N, 2)- Principal Stress CalculationsIf STR(3) = 0 ThenS1 = STR(1): S2 = STR(2): ANG = 0If S2 S1 ThenS1 = STR(2): S2 = STR(1): A
13、NG = 90End IfElseC = 0.5 * (STR(1) + STR(2)R = Sqr(0.25 * (STR(1) - STR(2) 2 + (STR(3) 2)S1 = C + R: S2 = C - RIf C STR(1) ThenANG = 57.2957795 * Atn(STR(3) / (S1 - STR(1)If STR(3) 0 Then ANG = 90 - ANGIf STR(3) S1For N = 1 To NE Print #2, Format(N, );Print #2, Format(Stress(N, 1), 0.0000E+00 );Prin
14、t #2, Format(Stress(N, 2), 0.0000E+00 );Print #2, Format(Stress(N, 3), 0.0000E+00 );Print #2, Format(PrinStress(N, 1), 0.0000E+00 );Print #2, Format(PrinStress(N, 2), 0.0000E+00 );Print #2, Format(PrinStress(N, 3), 0.0000E+00 )Next N- Reactions -Print #2, DOF# REACTIONFor I = 1 To NDN = NU(I)Print #
15、2, Format(N, ); Format(React(I), 0.0000E+00)Next IClose #2picBox.Print Complete results are in file ; File2If IPL 1 ThenFile3 = InputBox(Plot Data File d:dirfileName, Name of File)Open File3 For Output As #3Print #3, Element Stress ValuesFor N = 1 To NEPrint #3, PltStress(N)Next NpicBox.Print Element Stess Data in ; File3picBox.Print Run BESTFIT and then CONTOURA or CO
