helical compressing spring calculation.pdf
TRANSCRIPT
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7/27/2019 Helical Compressing Spring Calculation.pdf
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Hel i cal Compr ess i ng Spr i ng Cal cul at i on
Vi kt or Kovt un, mechani cal engi neerBr azi l
vi kt or . kovt un@gmai l . com
I ni t i al Dat a
N100F1 N250F2 mm20_working
610N_r es Spr i ng Resour ce i n Cycl es of Loadi ng
Mechani cal Pr oper t i es of Spr i ng Mat er i al
GPa207E Modul us of El ast i ci t y
0, 30 Poi ss ons Rat i o
MPa1700_ut Ul t i mat e Tensi l e St r engt h
3m
kg7850 Densi t y
12
EG Shear Modul us
GPa79, 6154G
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Cal cul at i on
_adm Admi s si bl e Shear St r ess;_adm = (0.250.3)*_ut f or 10 5 < N < 10 7;_adm = (0.450.5)*_ut f or 2*10 3 < N
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Na3
D8
G4
dk k= F/ Spr i ng Rat e
mm
N7, 559k
1, 5N_ squar ed Number of Squar ed Coi l s
1, 5N_ gr ound Number of Gr ound Coi l s
N_ s quar edNaN_t ot al Tot al Number of Coi l s
10, 5N_t ot al
4dG
Na3
DF18_F1 mm13, 23_F1
4dG
Na3
DF28_F2 mm33, 07_F2
_F1_F2_working mm19, 844_working
4dG
Na3
DF38_F3 mm38, 91_F3
N_ gr ound1N_t ot aldL3 mm35L3
_F3L3L0 mm73, 91L0
_F1L0L1 mm60, 68L1
_F2L0L2 mm40, 84L2
Na_F3
dp0 mm7, 823p0
Na
_workingdp1 mm5, 705p1
The condi t i on f or absol ut e st abi l i t y: L0 < L_ cr i t .
Do2, 62L_cri t
1
mm82, 53L_cri t
2
L0Do
2
6, 8511L00, 813_buckling
I f t he spr i ng i s absol ut el y st abl e,t he r esul t i s compl ex number .
mmi29, 696960, 0886_buckling
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at anD
p0 Pi t ch Angl e
deg5, 0823
N_ squar edcos
NaDL_ spr i ng_devel opment
mm926, 75L_ spr i ng_devel opment
L_ s pr i ng_devel opment1, 07L _ s t ock
mm991, 63L _ s t ock
L i t er at ur e
1. Rober t L. Nor t on. Machi ne Desi gn, 3d Edi t i on. ;2. .. , .. . .
( V. V. Shel of ast , T. B. Chugunova. Basi cs of Machi ne Desi gn) ;
3. . ( L. Andr eeva. El ast i c el ement s of mechani sms) .
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Li nk t o downl oad t he cal cul ai on:ht t p: / / www. medi af i r e. com/ downl oad/ m5583k29r t q5l 9b/ Hel i cal _Compr essi ng_Spr i ng. sm
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