217_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

217_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

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Unformatted text preview: Sec_2.7.qxd 9/25/08 11:42 AM Page 211 SECTION 2.7 Strain Energy (c) COMPARISON OF STRAIN ENERGY U WITH THE QUANTITY P C/2 U PdC 2 6.55 J 1 (80 N)(168.8 mm) 2 6.75 J The two quantities are not the same. The work done by the load P is not equal to P C/2 because the loaddisplacement relation (see below) is non-linear when the displacements are large. (The work done by the load P is equal to the strain energy because the bungee cord behaves elastically and there are no energy losses.) U PdC 2 area OAB under the curve OA. area of triangle OAB, which is greater than U. 211 ...
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This note was uploaded on 12/22/2011 for the course MEEG 310 taught by Professor Staff during the Fall '11 term at University of Delaware.

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