Accession Number:

ADA123541

Title:

Time - Domain First Born Approximations to Elastodynamic Backscatter with Applications to Non-Destructive Evaluation of Composites.

Descriptive Note:

Final rept. Jun 81-Jan 82,

Corporate Author:

AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1982-12-01

Pagination or Media Count:

54.0

Abstract:

Fiber-reinforced composite materials are bieng introduced into primary structures of modern jet fighter aircraft, e.g., vertical and horizontal stabilizers on the F-15 and F-16 fighters. These materials are made of many layers each layer consists of many rows of parallel fibers bound together by a matrix material of different composition than the fibers. Failure often occurs in these composites via delamination which initiates at gas bubbles porosity remaining in the matrix after the manufacturing process. For this and other reasons, non-destructive inspection techniques capable of determining the presence of the porosity are being sought. Current efforts include inspection with elastic waves. Items of interest include comparison of the response from the fibers to that from porosity and the degree to which the fibers may appear transparent to the waves.

Subject Categories:

  • Laminates and Composite Materials
  • Numerical Mathematics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE