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Unformatted text preview: 40 (see figure). (a) What is the maximum bending stress s max in the rule? (b) By what percent does the stress increase or decrease if the central angle is increased by 10%? L = length M M t a Solution 5.5-3 (a) M AX . BENDING STRESS ; s max 38.2 ksi s max Et a 2 L s max E t 2 r s max Et 2 r r L a r 68.755 inches E 30 (10 6 ) psi L 48 inches t 0.175 in. a 40 a p 180 b a 0.698 radians (b) % C HANGE IN STRESS DUE TO 10% INCREASE IN ANGLE linear increase (%) ; s new s max s max (100) 10% s new E t (1.1 a ) 2 L s new 41997 psi a 05Ch05.qxd 9/24/08 4:59 AM Page 393...
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- Fall '11