TAILIEUCHUNG - shi20396 chương 10

Many designers provide (L0)cr/L0 ≥ 5 or more; therefore, plain ground ends are not often used in machinery due to buckling uncertainty. | Chapter 10 10-1 10-2 A Sdm dim Auscu dim S dim dm kpsi inm dim Asi dim Si dim dm MPa mmm MPa mmm m m Asi PST n Auscu mAuscu mAuscu Ans. For music wire from Table 10-4 Auscu 201 m what is Asi ASI 0-145 201 2214 MPa mmm Ans. 10-3 Given Music wire d in OD in plain ground ends Nt 12 coils. Table 10-1 Table 10-4 a Eq. 10-14 Table 10-6 Na Nt - 1 12 - 1 11 Ls dNt 12 in A 201 m 201 Sut 0-145 2785 kpsi Ssy kpsi D - in D C d Eq. 10-6 4 2 Kb B 4 - 3 Eq. 10-3 nd3Ssy n 3 103 F S lbf sy 8KbD 8 Eq. 10-9 d4G 4 106 k lbf in 8D3Na 8 3 11 L0 Ls in Ans. k 270 Solutions Manual Instructor s Solution Manual to Accompany Mechanical Engineering Design b F ssy Ibf Ans. c k Ibf in Ans. x d Lo cr -------- -------J-------- in a Many designers provide L0 cr L0 5 or more therefore plain ground ends are not often used in machinery due to buckling uncertainty. 10-4 Referring to Prob. 10-3 solution C Na 11 Ssy kpsi L0 cr in and F Ibf at yield . Eq. 10-18 4 C 12 C . Eq. 10-19 3 Na 15 Na 11 . Lo in Ls in F1 y1 -r k 30 Li Lo - yi - in Eq. 10-20 - 1 y1 - 260 - 1 . From Eq. 10-3 for static service T1 ns 8 F1D n d3 Ssy _ 103 _ 1 . 83 224 Kb 8 30 83 224 psi L n 3 T1 Eq. 10-21 ns ns . Ts T1 30 J 83 224 125 391 psi Ssy Ts 103 125 391 1 Ssy ts ns d Not solid-safe. Not . L0 L0 cr Margin could be higher Not . Design is unsatisfactory. Operate over a rod Ans. Chapter 10 271 10-5 Static service spring with HD steel wire d 2 mm OD 22 mm Nt turns plain and ground ends. Preliminaries Table 10-5 A 1783 MPa mmm m Eq. 10-14 1783 Sut 2 1563 Mpa Table 10-6 Ssy 1563 MPa Then D OD - d .

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