Primary Adhesively Bonded Structure Technology (PABST). Design Handbook for Adhesive Bonding

摘要

The Air Force Primary Adhesively Bonded Structure Technology (PABST) Program was started in February 1975 for the purpose of validating the concept of adhesive bonding primary fuselage structural members together in lieu of the use of rivets. The goal of the Program was to provide a cost saving of 20 percent of the acquisition and maintenance cost of ownership. It was further desired to show a 15 percent weight saving for the bonded assemblies. The Program is now complete and the damage tolerance and durability of bonded structure has been shown to exceed, by far, that of riveted structure. Also the cost and weight savings goals appear to be obtainable for a production article. The design guidelines for a bonded primary structure are presented. The complete design criteria are identified for successfully developing bonded primary structure. It includes the fatigue, damage tolerance, and fail-safe criteria for both the metallic structure and adhesive bond area. A section discusses the material selection requirements, and another one presents the manufacturing considerations required to properly bond the primary structure. A review of the inspection needs is presented followed by a discussion of the repairability of the bonded structure. The cost and weight analysis review the methods used to determine results obtained on the Program. A complete section covers the loads, load transfer, and failure modes of bonded joints and this is followed by an analysis section which describes numerical methods for analyzing all manner of bonded joints with and without adjacent metal flaws.