{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

214_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

# 214_Mechanics SolutionInstructors_Sol.Manual-Mechanics_Materials_7e.book_Gere_light.1

This preview shows pages 1–2. Sign up to view the full content.

Problem 2.7-11 A block B is pushed against three springs by a force P (see figure). The middle spring has stiffness k 1 and the outer springs each have stiffness k 2 . Initially, the springs are unstressed and the middle spring is longer than the outer springs (the difference in length is denoted s ). (a) Draw a force-displacement diagram with the force P as ordinate and the displacement x of the block as abscissa. (b) From the diagram, determine the strain energy U 1 of the springs when x 2 s . (c) Explain why the strain energy U 1 is not equal to P /2, where 2 s . 208 CHAPTER 2 Axially Loaded Members Solution 2.7-11 Block pushed against three springs Force P 0 required to close the gap: P 0 k 1 s (1) F ORCE - DISPLACEMENT RELATION BEFORE GAP IS CLOSED P k 1 x (0 x s )(0 P P 0 ) (2) F ORCE - DISPLACEMENT RELATION AFTER GAP IS CLOSED

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}