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ch01-03 stress & strain & properties

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03 Solutions 46060 5/7/10 8:45 AM Page 14 © 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. 3–17. A tension test was performed on an aluminum 2014-T6 alloy specimen. The resulting stressstrain diagram is shown in the figure. Estimate (a) the proportional limit, (b) the modulus of elasticity, and (c) the yield strength based on a 0.2% strain offset method. s (ksi) 70 60 50 40 30 20 10 0 0.02 0.04 0.06 0.08 0.10 0.002 0.004 0.006 0.008 0.010 P (in./in.) Proportional Limit and Yield Strength: From the stressstrain diagram, Fig. a, s pl = 44 ksi s Y = 60 ksi Ans. Ans. Modulus of Elasticity: From the stressstrain diagram, the corresponding strain for s PL = 44 ksi is e pl = 0.004 in.>in. Thus, E = 44 - 0 0.004 - 0 = 11.0(103 ) ksi Ans. Modulus of Resilience: The modulus of resilience is equal to the area under the 14

03 Solutions 46060 5/7/10 8:45 AM 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. 3–18. A tension test was performed on an aluminum 2014-T6 alloy specimen. The resulting stressstrain diagram is shown in the figure. Estimate (a) the modulus of resilience; and (b) modulus of toughness. s (ksi) 70 60 50 40 30 20 10 0 0.02 0.04 0.06 0.08 0.10 0.002 0.004 0.006 0.008 0.010 P (in./in.) stressstrain diagram up to the proportional limit. From the stressstrain diagram, Thus, s pl = 44 ksi e pl = 0.004 in.>in. AU i B r = 1 2 s ple pl = 1 2 (44)(103 )(0.004) = 88 in # lb in 3 Ans. Modulus of Toughness: The modulus of toughness is equal to the area under the entire stressstrain diagram.This area can be approximated by counting the number of squares. The total number of squares is 65. Thus, CAU i B t D approx = 65B10(10 3 ) lb in R 2 c0.01in. in. d = 6.50(103 ) in # lb in 3 Ans. The stressstrain diagram for a bone is shown, and can be described by the equation 3–19. The stressstrain diagram for a bone is shown, and can be described by the equation P=0.45110 -6 2 s 0.36110 -12 2 s 3 , where s is in kPa. Determine the yield strength assuming a 0.3% offset. s P P 0.45(10 6 )s + 0.36(10 12 )s 3 P P e = 0.45(10 -6 )s + 0.36(10 -12 )s 3 , dP =A0.45(10 -6 ) + 1.08(10 -12 ) s 2 Bds E = ds dP 2 s = 0 1 = = 2.22 MPa 0.45(10 - 6 ) Ans. 15

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