Page 195 - Mechanics of Microelectromechanical Systems

182 Chapter 3
Answer:
Stiffness of U-spring is 10.24 N/m.
Stiffness of sagittal spring is 372.46 N/m (for

Problem 3.13
A folded-beam spring as the one sketched in Fig. 3.37 is microfabricated
by a technology which imposes a thickness of Find the cross-
sectional width w of its two compliant legs assuming that
E = 150 GPa and when a stiffness needs to be produced.

Answer:

Problem 3.14
Find the number of curved springs with
and E = 130 GPa‚ which combined as shown in Fig. 3.40 will be able to
produce a rotation angle of 2° under an external torque of

Answer:
n = 4

Problem 3.15
A thin spiral spring with a small number of turns and with its external
end free‚ needs to have its compliance 5 times larger than in an
application where and Determine the external radius

Answer:

References

1. W.C. Young‚ R.G. Budynas‚ Roark ’s Formulas for Stress and Strain‚ Seventh Edition‚
McGraw Hill‚ New York‚ 2002.
2. N.P. Chironis – Editor‚ Spring Design and Application‚ McGraw-Hill Book Company‚ New
York‚ 1961.
3. A.M. Wahl‚ Mechanical Springs‚ McGraw-Hill Book Company‚ Second Edition‚ New York‚
1963.