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# ch01-03 stress &amp; strain &amp; properties

## 02 Solutions 46060

02 Solutions 46060 5/6/10 1:45 PM Page 15 © 2010 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. This material is protected under all copyright laws as they currently exist. No portion of this material may be reproduced, in any form or by any means, without permission in writing from the publisher. 2–26. The material distorts into the dashed position shown. Determine (a) the average normal strains along sides AC and CD and the shear strain g xy at F, and (b) the average normal strain along line BE. 10 mm y 15 mm C B 25 mm D E 90 mm 75 mm A 80 mm F x Referring to Fig. a, L BE = 2(90 - 75) 2 + 80 2 = 26625 mm L AC¿ = 2100 2 + 15 2 = 210225 mm L C¿D¿ = 80 - 15 + 25 = 90 mm f = tan -1 ¢ 25 p rad ≤ = 14.04°¢ ≤ = 0.2450 rad. 100 180° When the plate deforms, the vertical position of point B and E do not change. L BB¿ 90 = 15 100 ; L BB¿ = 13.5 mm L EE¿ 75 = 25 100 ; L EE¿ = 18.75 mm L B¿E¿ = 2(90 - 75) 2 + (80 - 13.5 + 18.75) 2 = 27492.5625 mm Thus, Ae avg B AC = L AC¿ - L AC L AC = 210225 - 100 100 = 0.0112 mm>mm Ans. Ae avg B CD = L C¿D¿ - L CD = 90-80 = 0.125 mm>mm L CD 80 Ans. Ae avg B BE = L B¿E¿ - L BE L BE = 27492.5625 - 26625 26625 = 0.0635 mm>mm Ans. Referring to Fig. a, the angle at corner F becomes larger than 90° after the plate deforms. Thus, the shear strain is negative. 0.245 rad Ans. 15

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