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Page Two <br />Stress Model, contd. <br />St = 10.868(12) = 521,664 = 3,623 ~/In2 <br />.25 <br />Z = (8.625 3 -(8.625)3 = 17.54 <br />6 6 ~' ~" <br />Aoop stress calculation ~~ <br />Assume stresses in the y b Z directions are equal <br />Sh = 1,100 (8.625) = 18,975 <br />2 (.25) <br />Additional length stress: <br />pe =(10.22 + 297.5 2)'S = 297.6748 <br />e =.1748(2.75) = 1.616 x 10 -3 <br />297.5 <br />= eE = 1.616 x 10_3 (30 x 106) = 48,476 <br />Sx Max = 7,455 + 48,476 = 55,930 <br />SE = rr(1.3) 55,93012 + 4 (3,623)2 1'5=8,347 <br />`` 17.54 J J <br />SE' = 8,347 + 18,975 = 27,322 <br />SE = 8,347 < 52,000 (.72) = 37,440 = Sa <br />SE' = 27,322 < 37,440 (.75) = 28,080 = Sa' SATISFACTORY <br />