Non-Destructive Inspection Techniques for Acrylic Canopies,
Abstract
The advantages and necessities of non-destructive inspection (NDI) of aircraft structural components have gained wide recognition in the aerospace industry. This extends to evaluation of transparent enclosure materials in which the structural adequacy and integrity of the component must be determined. This paper describes the tank required in the development and application of an ultrasonic NDI method for detection of defects and determination of variations in material characteristics in aircraft canopies. Selection and development of applicable NDI techniques sensitive for measurement or detection of three test conditions is discussed. Three different techniques were required. These include: (1) a pulse-echo technique for detection of debond condition at the inner surface of the nylon and canopy glass, (2) a delta technique for detection of subcritical cracks in canopy glass, and (3) an angle beam technique for determination of the distance between the canopy glass and attach holes. A brief theoretical approach to each technique is presented in terms of wave propagation and response characteristics relative to location, size, type, and orientation of defects or variations in required material properties. Transducer evaluation and reference standard development is described as well as the development of various fixturing devices and inspection aids. Inspection capabilities, limitations, and test results are discussed. Information is presented concerning the application of the techniques for each test condition in terms of procedures, equipment requirements, and personnel training. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1976
- Accession Number
- ADA092982
Entities
People
- G. F. Thomas
- S. I. Shelton
Organizations
- Vought