In this last of three parts dealing with bolted joints, David Dearth, a consulting stress analyst and president of Applied Analysis & Technology, Huntington Beach, Calif., shows how flexible brackets deform when loaded.
What is in this article?:
- Sizing bolts for flexible brackets
- Calculations and notes for the FEA models
Calculations and notes for the FEA models
Readers will find several PDFs such as the one titled Bolt Reactions HandCalcs.pdf at MachineDesign.com/MD/bolts. The files contain detailed hand calculations with arithmetic for the models in this series. The files are also available from Dearth at AppliedAT@aol.com. FEA models, RigidMdl_BoltReactions_v2004.mod and FlexMdl_BoltReactions_v2004.mod, are small enough to process using limited-node or demo versions of MSC/Nastran v2004. To obtain a free copy of the limited-node software, log onto: mscsoftware.com/offers/master/contact.cfm or telephone MSC Software at (866) 672-1549. However, the files will also work in any version of Nastran.
FOR FURTHER READING John H. Bickford, An Introduction to the Design and Behavior of Bolted Joints, Chapter 15, Introduction to Joint Failure, Marcel Dekker Inc., 1981.
J.E. Shigley & C.R. Mischke, Standard Handbook of Machine Design, Chapter 23, Bolted and Riveted Joints, McGraw-Hill Book Co., 1986.
Erik Oberg, Franklin D. Jones, and Holbrook L. Horton, Machinery's Handbook 26th Edition, "Bolts, Screws, Nuts and Washers Formulas for Stress Areas and Lengths of Engagement of Screw Threads," Industrial Press, 2000.