Page 243 - Materials Science and Engineering An Introduction

Questions and Problems • 215

Reprinted with permission of John Wiley & Sons, Inc.

6.4FE A specimen of steel has a rectangular cross 6.5FE A cylindrical specimen of undeformed brass
section 20 mm wide and 40 mm thick, a shear that has a radius of 300 mm is elastically deformed
modulus of 207 GPa, and a Poisson’s ratio of 0.30. to a tensile strain of 0.001. If Poisson’s ratio for
If this specimen is pulled in tension with a force of this brass is 0.35, what is the change in specimen
60,000 N, what is the change in width if deforma- diameter?
tion is totally elastic? (A) Increase by 0.028 mm
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(A) Increase in width of 3.62 * 10 m (B) Decrease by 1.05 * 10 m
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(B) Decrease in width of 7.24 * 10 m (C) Decrease by 3.00 * 10 m
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(C) Increase in width of 7.24 * 10 m (D) Increase by 1.05 * 10 m
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(D) Decrease in width of 2.18 * 10 m