columbus · Reduction of the Endurance Limit as a Result of Stress Interaction in Fatigue

Reduction of the Endurance Limit as a Result of Stress Interaction in Fatigue

Title: Reduction of the Endurance Limit as a Result of Stress Interaction in Fatigue
Date: 1961
Index Abstract: Not Available
Photo Quality: Undetermined
Report Number: WADD TR 60-752
Creator: Heller, Robert A.
Corporate Author: Columbia University
Laboratory: Materials Central
Extent: 33
Identifier: AD0258024
Access Rights: OTS
Distribution Classification: 1
Contract: AF 33(616)-7042
DoD Task: 73521
DTIC Record Exists: Yes
Distribution Change Authority Correspondence: None
Abstract: This paper presents the results of an investigation of the effects of stress interaction on fatigue life of aircraft structural materials subjected to randomized load spectra. All three materials: 2024 and 70?5 aluminum and SAE 4340 steel exhibit fatigue lives shorter than those predicted on the basis of the linear (Miner) damage rule. A quasi-linear rule is proposed with a variable, spectrum dependent. endurance limit producing safe life estimates; the dependence of the endurance limit on the stress spectrum and its resulting design inadequacy is shown. Tests were performed on high speed, programmed, rotating bending fatigue machines of special design.
Report Availability: Not available via Contrails
DoD Project: 7351 - Metallic Materials
Date Issued: 1961-02
Index In: DTIC
Type: report