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Proceedings Paper

Life determination of riveted aircraft structure by holographic NDE
Author(s): John P. Baird; Rikard B. Heslehurst; Hugh M. Williamson; Robert K. Clark; Derek Hollamby
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Paper Abstract

In a project funded by the Federal Aviation Administration's (FAA) Aging Aircraft Program, a Portable Holographic Inspection System (PHITS) has been further developed. The technique involves taking a double exposure white light reflection hologram of aircraft structures. Each exposure is taken at a slightly different load state, and the resulting interferogram shows the deformations that occur between the two load states. Results showed that the rivets in a simple lap joint, designed to simulate the longitudinal lap splice on a Boeing 737, behaved in two distinct and easily recognizable modes. The first mode occurred at low loads and was an indication that friction forces between the two sheets of the lap joint dominated the load transfer mechanism. Indications were that the second mode related to higher loads for which the friction forces played a much lesser role. The load at which the changeover begins to occur has been called the critical load. Preliminary experiments showed that structures with a high value of critical load had a fatigue life of order ten times that of a normally fastened splice. Critical load can be readily determined in the field using the PHITS system. Research designed to establish the relationship between fatigue life and critical load is continuing. An understanding of that relationship could lead to a technique capable of fatigue life determination in typical aircraft structures.

Paper Details

Date Published: 14 November 1996
PDF: 6 pages
Proc. SPIE 2945, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware, (14 November 1996); doi: 10.1117/12.259090
Show Author Affiliations
John P. Baird, Univ. of New South Wales (Australia)
Rikard B. Heslehurst, Univ. of New South Wales (Australia)
Hugh M. Williamson, Univ. of New South Wales (Australia)
Robert K. Clark, Univ. of New South Wales (Australia)
Derek Hollamby, Univ. of New South Wales (Australia)

Published in SPIE Proceedings Vol. 2945:
Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware
Raymond D. Rempt; Alfred L. Broz, Editor(s)

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