Accession Number:

ADA094349

Title:

Investigation of EMAT Base System for the Detection of Bolt Hole Type Cracks. Part 1. Detection of Cracks in the Inaccessible Lower Half of Wing Lap Joints Using EMATS

Descriptive Note:

Interim rept. 1 Apr-31 Aug 1978

Corporate Author:

ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CA SCIENCE CENTER

Report Date:

1980-07-01

Pagination or Media Count:

66.0

Abstract:

The detection of saw slots in an aircraft wing lap joint is demonstrated with EMATS Electromagnetic acoustic transducers utilizing 250 KHz horizontal shear acoustic waves reflected from the fastener area. A real-time Fourier transform signal processor was developed and used to gather experimental data and generate plots of power vs. frequency as well as the complex transform. A simple ultrasonics model is described which is capable of explaining many of the features of the experimental data.

Subject Categories:

  • Aircraft
  • Couplers, Fasteners and Joints
  • Test Facilities, Equipment and Methods
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE