problems_II_7

# problems_II_7 - problem_II_7_1.nb In[42:= [email protected]

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In[42]:= Apply @ Clear, Names @ "Global` " DD ; Off @ General::spell D ; Off @ General::spell1 D ; H helical compression spring hard drawn spring steel ends are plain and ground L d = 2. 10^ 3; H m L D0 = 24. 10^ 3; H m L Nt = 9.; Na = Nt 1; Ls = dNt; Print @ "Ls = ", Ls, " m" D ; mD = D0 d; H mean diameter L G = 79 10^9; k = H d^4G LêH 8mD^3Na L ; Print @ "k = ", k, " N ê m" D ; m = 0.201; A = 1510 10^6; Cind = mD ê d; Sut = A ê d^m; Ssy = 0.5 Sut; Ks = H 2 Cind + 1 LêH 2 Cind L ; Fs = H Ssy N @ Pi D d^3 LêH 8mDKs L ; Print @ "Fs = ", Fs, " N" D ; def = Fs ê k; L0 = Ls + def; Print @ "L0 = ", L0, " m" D ; Rx = L0 ê mD; Ry = def ê L0; Print @ "Rx = ", Rx D ; Print @ "Ry = ", Ry D ; Print @ "unstable" D ; Ls = 0.018 m k = 1854.81 N ê m Fs = 359.635 N L0 = 0.211893 m Rx = 9.63152 problem_II_7_1.nb 1

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Ry = 0.915052 unstable problem_II_7_1.nb 2
In[111]:= Apply @ Clear, Names @ "Global` " DD ; Off @ General::spell D ; Off @ General::spell1 D ; H helical compression spring made of steel closed ends L d = 3 10^ 3; H m L D0 = 56 10^ 3; H m L L0 = 0.1; H m L Nt = 13; mD = D0 d; Cind

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problems_II_7 - problem_II_7_1.nb In[42:= [email protected]

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