Unformatted text preview: Do Va u
‘ 5:: 30 :1 lo‘ PROBLEM 4.17 1 Poin'is D anal E are ¥qw+he$+k¥ruwx ‘Hw. hed‘l'm) efo. yo 6.05 2579 "' 2'9 8M 25.79 =1—5)¢n525,7°  45 gin 25:7" 4.170 The Z section shown is subjected to a couple MD acting in a vertical plane.
Determine the largest permissible value of the moment Mo of the couple if the maximum
stress is not to exceed 80 MPa. Given: [m = 2.28 X 10‘ mm“, [min a 0.23 x 10‘ mm“,
principal axes 257° x and 64.3" 2. 4.171 Solve Prob. 4.170, assuming that the couple M0 acts in a horizontal plane SOLUTION 0.23 7110‘me = O_2$X{O‘ ml, I...r = 2.13xto‘mm”= 2.23 w 20‘ m  29.02 mm 2, cos 25.70 + 39 em 25.70 = as cm2§.?°+ (5) 51‘4 251‘.” 38.38 mm M V ‘— (M. s r» 6?.3°)(ss. 32 ”03) (Mlcoscq;3°)(zmmd‘l + .
2.28 K (0' aﬂsxlo“ _..,.__P+_‘.JLVE:
I” :0 €0.43X103 Mo 1.37.3 kMm [.323 HO: NM ...
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 Summer '10
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