Springs F10 part 2 - MACHINE DESIGN- An Integrated...

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Unformatted text preview: MACHINE DESIGN- An Integrated Approach, 2ed by Robert L. Norton, Prentice-Hall 2000 Maximum Percent of Ultimate Tensile Strength Material Before Set Removed (Use Eq. 13.9 b ) After Set Removed (Use Eq. 13.8 b ) Nonferrous alloys (e.g., B134, B159, B197) Austenitic stainless steel (e.g., A313) Hardened and tempered carbon and low-alloy steel (e.g., A229, A230, A232, A401) Cold-drawn carbon steel (e.g., A227, A228) 35 35 50 45% 55 – 65 55 – 65 65 – 75 60 – 70% Table 13-6 Maximum Torsional Yield Strength S ys for Helical Compression Springs in Static Applications Bending or Buckling Stresses Not Included. Source: Adapted from Ref. 1 MACHINE DESIGN- An Integrated Approach, 2ed by Robert L. Norton, Prentice-Hall 2000 F I G U R E 1 3 - 1 3 End Conditions Determine Critical Buckling Situation Adapted from Reference 1 (b) Parallel ends (a) Nonparallel ends fixed end free to tip constrained parallel fixed end MACHINE DESIGN- An Integrated Approach, 2ed by Robert L. Norton, Prentice-Hall 2000 ratio of free length / mean diameter L f / D r a t i o o f d e f l e c t i o n / f r e e l e n g t h y / L f 0.10 0.20 0.30 0.40 0.50 0.60 0.70 2 3 4 5 6 7 8 9 10 F I G U R E 1 3 - 1 4 Critical Buckling Condition Curves Adapted from Reference 1 (a) (b) parallel ends nonparallel ends unstable stable stable unstable Jpr',1 {ry" ooo ul uJ uJ TETf(E (((* flfi'ii oo a= aaaJ ororoif lltl aaast FFFF ui u uJ lrJ ut Lu uJ trJ IIII (naoo oooo roooo F o,l Ol tttl L)(Ot\N c)c)(rro OlOl6lF ?999 (rr(')C.)(') F UJ =o o (^= L d- ,if Norpz J&ilaffi61 /W{(a a,6w;yu t,fu^a qU4/o/kt& w a {*-'rr\Woilo( C, 1fficr^dffi {t' u{ryffifu-f ilrnnr*t ry& ^/r,*Bx /t,,r, ffi^{u, filX{ t,-Au&ryu (M, I,o, 13 7 _tu 32"{ oo@ u, uJ ul (f(rtr ({(- aaag A)U'OJ tooloE rttl aaaa FFFF uJ lrJ t! ul u.,t uJ t! ul IIII QOOA oooo roooo FNOI tttl Ittl u)(oNN ('(Y)(rrct (\lOlAlr 9999 (r) (r, (t) (t) F ul I o |J M Afryut*qh &f*,tLk x"''r^ lr"rlrdtr 6a lL /.* at' ^ ,*'il/'J / 2,5 " n' (ut I Pr,rr"to...
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This note was uploaded on 11/10/2010 for the course ME 338 taught by Professor Campbell during the Fall '09 term at University of Texas at Austin.

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Springs F10 part 2 - MACHINE DESIGN- An Integrated...

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