Accession Number : AD0653282

Title :   MONOTONIC AND COMPLETELY REVERSED CYCLIC STRESS-STRAIN AND FATIGUE BEHAVIOR OF REPRESENTATIVE AIRCRAFT METALS.

Descriptive Note : Final rept., 1 Feb 65-1 Feb 66,

Corporate Author : ILLINOIS UNIV URBANA DEPT OF THEORETICAL AND APPLIED MECHANICS

Personal Author(s) : Endo,T. ; Morrow,JoDean

Report Date : JUN 1966

Pagination or Media Count : 38

Abstract : Monotonic and cyclic stress-strain and fatigue behavior in the life range of approximately 10 to 100,000 cycles are experimentally determined for 2024-T4 and 7075-T6 aluminum alloys, SAE 4340 steel (quenched and tempered at 1000F), and titanium alloy 8-1-1. The purpose of the investigation is to establish the necessary materials information and base line fatigue data for cumulative damage studies. Plots of the fatigue life as function of elastic, plastic and total strain at half the fatigue life are presented for the four metals. The usual log-log linear relationships between fatigue life and the elastic and plastic components of strain do not satisfactorily fit the fatigue results, especially for the two aluminum alloys. Thus, it will be necessary to use the actual fatigue plots rather than simple power functions as the base line fatigue data for cumulative damage studies. (Author)

Descriptors :   (*ALUMINUM ALLOYS, MECHANICAL PROPERTIES), (*STEEL, MECHANICAL PROPERTIES), (*TITANIUM ALLOYS, MECHANICAL PROPERTIES), AIRCRAFT, METALS, STRESSES, STRAIN(MECHANICS), FATIGUE(MECHANICS), PLASTIC PROPERTIES, ELASTIC PROPERTIES, TENSILE PROPERTIES

Subject Categories : Aircraft
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE