Unformatted text preview: M a = 2178 lbf Â· in T m = 2500 lbf Â· in M m = T a = From Table 71, estimate stress concentrations for the endmilled keyseat to be K t = 2 . 2 and K ts = 3 . 0. For the relatively low strength steel specified (AISI 1020 CD), estimate notch sensitivities of q = . 75 and q s = . 9, obtained by observation of Figs. 620 and 621. Assuming a typical radius at the bottom of the keyseat of r / d = . 02 (p. 361), these estimates for notch sensitivity are good for up to about 3 in shaft diameter. Eq. (632): K f = 1 + . 75(2 . 2 âˆ’ 1) = 1 . 9 K f s = 1 + . 9(3 . âˆ’ 1) = 2 . 8 Eq. (619): k a = 2 . 70(68) âˆ’ . 265 = . 883 For estimating k b , guess d = 2 in. k b = (2 / . 3) âˆ’ . 107 = . 816 S e = (0 . 883)(0 . 816)(0 . 5)(68) = 24 . 5 kpsi M T R B R A 2500 lbf â€¢in 2178 lbf â€¢in 242 lbf Â± 1088 lbf 9 in 2 in 6 in V W Ans....
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 Fall '11
 Shingley
 Force, Shear, Stress concentration

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