Ultrasonic Detection of Fatigue Damage in Aircraft Components.
Abstract
The purpose of the present research is to extend and apply the ultrasonic techniques developed under AFOSR Contract No. F44620-71-C-0062 to the detection of fatigue damage in test specimens which are made from materials and possess geometries typical of actual aircraft components. Ultrasonic attenuation measurements made simultaneously with fatigue tests on aluminum alloy bars gave warning of crack formation and eminent fracture much earlier than conventional ultrasonic methods. Similar tests are currently being run on aluminum alloys possessing geometries typical of actual aircraft components. Analysis of acoustic emission measurements made simultaneously with ultrasonic attenuation measurements during fatigue testing have run into difficulty because of the lack of a proper acoustic emission characterization system which would permit optimum separation of the defect created acoustic emission signals from the background noise.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1977
- Accession Number
- ADA040009
Entities
People
- Robert B. Pond Sr.
- Robert E. Green Jr.
Organizations
- Johns Hopkins University