Variability in room temperature fatigue life of alpha + beta processed Ti–6Al–4V

The variability in fatigue behavior is often what drives the design of components such as turbine engine blades and disks. These components are critical and must be designed with a very low probability of failure over the lifetime of the system. To meet that design criterion, the lower limit of fati...

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Veröffentlicht in:International journal of fatigue 2009-11, Vol.31 (11), p.1764-1770
Hauptverfasser: Golden, Patrick J., John, Reji, Porter, W. John
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container_issue 11
container_start_page 1764
container_title International journal of fatigue
container_volume 31
creator Golden, Patrick J.
John, Reji
Porter, W. John
description The variability in fatigue behavior is often what drives the design of components such as turbine engine blades and disks. These components are critical and must be designed with a very low probability of failure over the lifetime of the system. To meet that design criterion, the lower limit of fatigue life capability is typically used. The challenge is to reliably predict the lower limit of fatigue behavior. This study investigates the fatigue variability of an alpha + beta processed Ti–6Al–4V turbine engine alloy by conducting a statistically significant number of repeated tests at a few conditions. Testing includes three conditions including two maximum stresses, 675 and 635 MPa; and two surface conditions, electropolished and low stress grinding. All tests are constant amplitude with a stress ratio of 0.1. A similar approach has been performed on several other turbine engine material systems often revealing a bimodal behavior. It is proposed that crack propagation using small crack growth data can be used to predict the low life behavior mode and is demonstrated with the Ti–6Al–4V data.
doi_str_mv 10.1016/j.ijfatigue.2009.01.005
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source Elsevier ScienceDirect Journals
subjects Applied sciences
Exact sciences and technology
Fatigue
Fatigue crack growth
Fatigue nucleation
Life variability
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Small crack growth
Ti–6Al–4V
title Variability in room temperature fatigue life of alpha + beta processed Ti–6Al–4V
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