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MD-8 Spring design

1 August 15, 2007 August 15, 2007118. 8. Spring designSpring designObjectivesObjectives Identify, describe, and understand principles of several types oIdentify, describe, and understand principles of several types of springs f springs including helical compression springs, helical extension springsincluding helical compression springs, helical extension springs, torsion , torsion tubes, and leaf Spring , and leaf Spring systems. design and analyze helical compression springs, including design and analyze helical compression springs, including compatibility with allowable with allowable stresses. Develop necessary analytical tools for Spring design . Develop necessary analytical tools for Spring design . Understand the principles of operation of springs and how to anaUnderstand the principles of operation of springs and how to analyze lyze the energy being absorbed by springs.

3 August 15, 2007 13 Fig. 8.6 Helical Compression Spring Design Free length, Lf Solid length, LS Deflection, δ August 15, 2007 14 Spring Rate Spring rate (k) is ratio of change in force to the change in length Force (F) exerted by the spring is F = k (Lf – Lo) Appendix 12 Standard spring selection L F k ∆ ∆ = Eq 8.1 Eq 8.2 August 15, 2007 15

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