Aluminum-Lithium Light Weight Frangible Collar Development
Document Number: 2008-01-2310
Date Published: September 2008
Author(s):
Hasim Mulazimoglu - Alcoa Fastening Systems
Rodrigo Pinheiro - Alcoa
Luke Haylock - Alcoa Global Fasteners
Abstract:
Light-weight aerospace fastening collars were manufactured from 2099 alloy which is a new-generation Al-Li alloy developed by Alcoa. The collars studied in this work are threaded self-locking collars with controlled torque-off feature and are to be used in a fastener assembly with a treated pin. The mechanical properties of 2099 collars were measured and compared to the ones made of incumbent alloys such as 7075 and 2024. It was found that the 2099 collars were 16% lighter but provided the equivalent mechanical properties. In addition, the corrosion characteristics of the 2099 collars were studied using the salt spray and alternate immersion test methods. It was observed that 2099 collars exhibited an improved corrosion performance as compared to the base line 7075 collars. This paper presents the results obtained from the mechanical and corrosion testing of the Al-Li collars along with the weight-saving potentials of the new product.
File Size: 1622K
Product Status: In Stock
Included in:
V117-2008
See other papers presented at Aerospace Manufacturing and Automated Fastening Conference & Exhibition, September 2008, North Charleston, SC, USA, Session: Fastening System Enhancements
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