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Unformatted text preview: Sec_3.9-3.11.qxd 340 9/27/08 1:14 PM Page 340 CHAPTER 3 Torsion Solution 3.11-4 Stepped shaft in torsion P 600 kW n D1 400 rpm Use the dashed line for a full quarter-circular fillet. 100 mm allow R
D1 100 MPa R Full quarter-circular fillet 7.5 mm POWER P 2pnT
( Eq. 3-42 of Section 3.7)
60 P watts n T 60P
2pn 60(600 * 103 W)
2p(400 rpm) rpm 0.075 (100 mm) 0.075 D1 T Newton meters
14,320 N # m D2 D1 D2 115 mm 2R 100 mm 2(7.5 mm) 115 mm ; This value of D2 is a lower limit ; (If D2 is less than 115 mm, R/D1 is smaller, K is larger,
and max is larger, which means that the allowable stress
is exceeded.) USE FIG. 3-48 FOR THE STRESS-CONCENTRATION FACTOR
tmax Kt nom K Ka 16T b tmax(pD3)
1 (100 MPa)(p)(100 mm)3
16(14,320 N # m) 1.37 Problem 3.11-5 A stepped shaft (see figure) has diameter D2
stress is 15,000 psi and the load T 4800 lb-in.
What is the smallest permissible diameter D1? 1.5 in. and a full quarter-circular fillet. The allowable shear ...
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This note was uploaded on 12/22/2011 for the course MEEG 310 taught by Professor Staff during the Fall '11 term at University of Delaware.
- Fall '11