Transcription of MD-8 Spring design
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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.
Spring Stresses Torsional shear stress Peak stress is more because of the curvature effect 3 W m S πD 8 F D S = Eq 8.8 August 15, 2007 29 Coil shear stress August 15, 2007 30 Wahl factor A stress factor is developed by Wahl to account for the the curvature. A plot of this factor against the spring index, C is shown in Fig. 8.8.
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