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A Fastener Analysis Addressing Various Types of Misfit and an Innovative Simple Design Solution
Technical Paper
2010-01-1833
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The fastener analysis for an airframe panels under random cyclic loading conditions were analyzed with various elaborate solutions. But here a simple technique is proposed to analyze the problem and prove the necessity for a design solution. It is shown that the misfit in the fastener system reduces the load capacity of the joint due to the lack of contact or reduced contact. This reduced contact also produces various stress concentration at the contact zones. In the cyclic loading environment this reduced load capacity and increased stress concentration produces elastic plastic deformation around the contact locations and at the same time a crack develops and propagates beyond the fastener system. This creates a load leak transparent to the fastener system. Thus the misfit fastener systems have a higher probability of aging than the fit fasteners. With the proof in hand various design patterns were proposed to improve the fatigue characters under varying types of loading conditions.
Citation
Anandan, V., "A Fastener Analysis Addressing Various Types of Misfit and an Innovative Simple Design Solution," SAE Technical Paper 2010-01-1833, 2010, https://doi.org/10.4271/2010-01-1833.Also In
References
- Torque Limits for Threaded Fasteners NASA MSFC-STD-486B Nov. 1992
- “SAE Fastener Standards Manual - 2009 Edition,” SAE International Warrendale, PA 978-0-7680-2170-7 2009
- LS_DYNA Keyword User's Manual 1 LSTC
- Fatigue life improvement in fatigue-aged fastener holes using the cold expansion technique X. Zhang a , and Z. Wang b International Journal of Fatigue sept 2003 a School of Engineering Cranfield College of Aeronautics Cranfield University Bedford MK43 0AL, UK b Beijing Aeronautical Technology Institute Beijing 100076, PR China