Accession Number:

ADA361403

Title:

Crack Growth Testing

Descriptive Note:

Final rept. 9 Jul 93-31 Jan 94

Corporate Author:

WRIGHT LAB WRIGHT-PATTERSON AFB OH FLIGHT DYNAMICS DIRECTORATE

Personal Author(s):

• Post, Roger A.

Report Date:

1994-03-01

Pagination or Media Count:

10.0

Abstract:

Test specimens of TI-6-2-4-2 were tested in an effort to determine the basic properties of the material. The main property investigated was the crack growth rate, dadn, relative to the size of the crack, a, over the fatigue life of the specimen. Yield zones at crack tips were also investigated on tills material. Specimens of Beta2lSSCS6, a titanium matrix composite, were also fatigue tested resulting in plots of crack growth rate, dadn, against the stress concentration factor K. Effort was also devoted to the development and installation of a new data system.

Descriptors:

• *CRACK PROPAGATION
• *TITANIUM
• STRUCTURAL PROPERTIES
• COMPOSITE MATERIALS
• CRACKING(FRACTURING)
• METAL MATRIX COMPOSITES
• FATIGUE(MECHANICS)

Subject Categories:

• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE