Fastener Design Course Part -4 : Fatigue Resistant Bolts | Fastener Torque | Nut Friction
Channel: Fasteners
Date: 2021-03-27

Fatigue resistant bolts are bolts that are made with a more durable material than the usual steel bolts. They are designed to be stronger than standard steel bolts and less likely to snap when put under high stress. The bolts are designed to look identical to bolts made of weaker metal, so they can be used in the same way as normal bolts.

One of the most common fatigue failures is a fastener being pulled from a hole due to the thread pulling out of the material. For some materials, the thread material may pull out of the hole, but the bolt may remain in place. There are also a number of fastener types that have the material surrounding the fastener itself. These include self-locking nuts, collarless bolts, and threaded inserts. For these, the fatigue failures often result in the fastener being pulled away from the surface. (In addition, there are often other forms of fatigue failures that are not as obvious). For fatigue resistant bolts, the holes need to be designed to have sufficient mass to resist fatigue failure, and the fastener must have the proper amount of friction

Fastener design is the process of using engineering principles to design fasteners for use in a product, system, or structure. One of the best ways to learn fasteners, in particular, is to sit down with an experienced practitioner and listen to him or her explain the ups and downs of their career. Richard T. Barrett is an aerospace engineer (aerospace engineer) at NASA Lewis Research Center in Cleveland. He has been involved in aerospace and rocketry for over forty years, including work on the Space Program, rocket engines, and launch pads. He is one of the world's experts on the subject of fasteners and fastener design.

Center tapped threads, acme threads, stub acme threads, buttress threads, cold rolled threads are no big deal since they are used in nearly every type of engineering project that requires fasteners. Some of these fasteners are used in more complicated projects than others. For example, you can find tapped threads, acme threads, stub acme threads, buttress threads, cold rolled threads used in the Lincoln Tunnel and the Brooklyn Bridge.

Source: http://www.sti.nasa.gov​
https://www.youtube.com/channel/UCI9BX-UcPOhsfr0fTklLytQ
This course is a comprehensive study of fastener technology. While this course is designed for aerospace engineers, mechanical engineers will find it beneficial. This course is about materials, plants and coatings. There is a summary of locking methods, threads, joint stiffness, rivets and inserts. There is also a discussion of lubricants and design considerations.

The world has changed a lot since the Wright brothers took off from Kitty Hawk in 1903. We now live in a high-tech, high-stress society that demands more and more from our machines and equipment. This is particularly true in the aerospace and aviation industries—where today's airplanes must master more complex flight maneuvers, and where the need for high-speed, high-strength joints and fastening devices is even greater. In the past, many engineers relied on trial and error to design fasteners. But those days are over. Today, one of the fastest—and most economical—ways to design high-performing fasteners is to use the computer.

This course is presented as a comprehensive reference on aeronautical fasteners technology, and covers fasteners materials, fasteners plantings and coatings, fasteners locking methods, fastener threads, fastener joint stiffness, fasteners rivets, fasteners inserts, fastener nut plates, fastener thread lubricants, and design criteria. The course is presented with lecture, charts, illustrations, and real-world experiences, designed to help you understand aerospace fasteners and how to select the right technology for your application.

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