Accession Number:

ADA061053

Title:

Definition and Modeling of Critical Flaws in Graphite Fiber Reinforced Epoxy Resin Matrix Composite Materials.

Descriptive Note:

Final rept. 28 Dec 76-28 Dec 77,

Corporate Author:

MATERIALS SCIENCES CORP SPRING HOUSE PA

Report Date:

1978-01-01

Pagination or Media Count:

138.0

Abstract:

Typical flaws are identified and static analyses developed or presented to predict their growth. A wearout fatigue concept is incorporated into the staticfatigue model and the concept of an instability boundary established for every flaw size and location. An experimental program is outlined to support the analysis and to measure the specific adhesive surface fracture energy quantitatively. Acoustic monitoring of the specimens to detect damage growth and a corresponding vibration analysis are carried out as a potential NDT and for correlation studies. Ultrasonic C scans are used to ensure quality control and to determine approximate damage growth rates. The analytical and experimental results are incorporated into an NDE technique to quantitatively determine a measure of the residual lifetime and strength of the structural component. A comparison of these with a quantified criterion for damage tolerance would establish flaw criticality through the need, or lack of it, for mandatory repair.

Subject Categories:

  • Polymer Chemistry
  • Ceramics, Refractories and Glass
  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE