Accession Number:

ADA071660

Title:

Environment - Load Interaction Effects on Crack Growth

Descriptive Note:

Final rept. Jul 1976-Aug 1978

Corporate Author:

MCDONNELL AIRCRAFT CO ST LOUIS MO

Personal Author(s):

Report Date:

1978-11-01

Pagination or Media Count:

224.0

Abstract:

The objective of this program was to systematically investigate chemical environment-load interaction effects on crack propagation. The program was focused by developing a set of design guidelines and criteria for a durability and damage tolerance control plan for landing gear. Current life prediction capability was assessed by comparison of prediction and test. A field survey was conducted to catalog the size, type, and locations of flaws in landing gear components. A crack growth prediction capability developed through analysis and test accounts for environment and load interaction effects. Materials studied are HP-9Ni-4Co-.30 and 300M steels, and 7075-T6 and 7049-T73 aluminums. A flight-by-flight test stress history was developed for a landing gear component, and crack growth predictions prepared. Subsequently, spectrum tests were performed. A DurabilityDamage Tolerance Control Plan for landing gear is outlined.

Subject Categories:

  • Attack and Fighter Aircraft
  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE