SEDL / STP / STP981-EB / STP30341S

Stress Analysis Concepts for Adhesive Bonding of Aircraft Primary Structure

Krieger, RB
Manager, American Cyanamid Company, Havre de Grace, MD

Pages: 12    Published: Jan 1988

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Abstract

This paper is a summation of the author's work towards creating valid stress analysis of adhesively bonded structure. The context is airframe construction, specifically metal to metal bonds, and excluding sandwich structure. A model joint is presented as being a basic representation of the problem. A linear formula is given to calculate the maximum stress on the joint. This is seen to be stiffness driven, hence the adhesive shear stiffness is indispensable. Two extensometers are described as follows: KGR-1 for adhesive shear stress versus strain, and KGR-2 for maximum adhesive strain on the model joint. An actual design is discussed, including adhesive selection by strain properties and adhesive quality control by adhesive stress versus strain data.