Accession Number : ADA329663

Title :   Materials Degradation and Fatigue in Aerospace Structures

Descriptive Note : Final rept. 1 Jul 93-30 Jun 97

Corporate Author : PURDUE UNIV LAFAYETTE IN SCHOOL OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Grandt, A. F., Jr.

PDF Url : ADA329663

Report Date : AUG 1997

Pagination or Media Count : 331

Abstract : This report summarizes research conducted by the Purdue University Schools of Engineering and Science during a four year AFOSR University Research Initiative focused on basic issues dealing with aging aircraft. The coordinated goals of the program fall into four main categories: damage development, prediction of crack growth and interaction failure prevention techniques, and advanced analysis methods. The damage development goals addressed the failure mechanisms of corrosion, fatigue crack formation, and fretting. The general objective of the crack growth and interaction tasks was to develop techniques to predict the growth of service induced cracks and to determine the impact of widespread cracking on damage tolerance. The theme of the failure prevention projects was to develop procedures to extend the operational life of older aircraft by delaying service induced damage. repairing cracked structure, and employing fleet tracking methods to prioritize maintenance actions within a fleet of aircraft. Finally, research was directed at developing advanced analysis methods used in other research tasks. These projects dealt with adding Statistical components to various materials evaluations and structural analyses, and developing ductile fracture criteria relative to aircraft materials and structures.

Descriptors :   *COMMERCIAL AIRCRAFT, *MILITARY AIRCRAFT, *FATIGUE LIFE, *AIRCRAFT MAINTENANCE, AGING(MATERIALS), LIFE EXPECTANCY(SERVICE LIFE), PREVENTIVE MAINTENANCE, STRUCTURAL ANALYSIS, FRACTURE(MECHANICS), CRACK PROPAGATION, REPAIR, DUCTILITY, TOLERANCES(MECHANICS), LIFE CYCLE MANAGEMENT, FRETTING, GALVANIC CORROSION, STRUCTURAL INTEGRITY.

Subject Categories : Aircraft
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE