Transcription of Bolt Preload Theory and Application - Applied CAx
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BoltPreloadTheoryandApplicationBolt Preload Theory and Applicationwith Femap and NX Nastran1/ 15 2011 All Rights ReservedBolt Preload Theory and ApplicationTable of Contents1. Introduction .. 32. Setting up the Model .. 43. Bolt Regions .. 54. Defining a Bolt Preload .. 65. Contact Regions .. Example of Bolt Preload ..87. Idealization of Bolt Preloads .. 108. Bolt Preloads with Plate Models .. 129. Bolt Preloads in Solid Models .. 1310. Summary .. 14 2011 All Rights Reserved2 2011 All Rights ReservedBolt Preload Theory and ApplicationIntroductionWhat is bolt Preload ?Bolt Preload is used to clamp together two plates or two structures and create a frictional lock between the members and reduce ppgpthe effects of cycling loading on the bolt. With respect to the latter ( , bolt fatigue), bolt Preload can make all the difference between a safe, long lasting structure or catastrophic failure.
Bolt Preload Theory and Application Idealization of Bolt Preloads Bolt preload can be idealized as: (Mechanical Engineering Design, Shigley, 3rd Ed, 1977) F l ilf blF bl ld F k k k P F i b s b b + + = * P externallyappliedload k boltstiffness k structurestiffness tota axial orceonbolt bolt preload b …
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