Cargando…
Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy
Ultrasonic fatigue tests up to 10(10) cycles were performed on a turbine engine titanium alloy (Ti-8Al-1Mo-1V) at the stress ratio (R) of −1 with smooth specimens and at R = −1, 0.1 and 0.5 with notched specimens. As a result, with increase of fatigue life, the source of reduced fatigue life caused...
Autores principales: | , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6163757/ https://www.ncbi.nlm.nih.gov/pubmed/30235842 http://dx.doi.org/10.3390/ma11091778 |
_version_ | 1783359437949370368 |
---|---|
author | Yang, Kun Zhong, Bin Huang, Qi He, Chao Huang, Zhi-Yong Wang, Qingyuan Liu, Yong-Jie |
author_facet | Yang, Kun Zhong, Bin Huang, Qi He, Chao Huang, Zhi-Yong Wang, Qingyuan Liu, Yong-Jie |
author_sort | Yang, Kun |
collection | PubMed |
description | Ultrasonic fatigue tests up to 10(10) cycles were performed on a turbine engine titanium alloy (Ti-8Al-1Mo-1V) at the stress ratio (R) of −1 with smooth specimens and at R = −1, 0.1 and 0.5 with notched specimens. As a result, with increase of fatigue life, the source of reduced fatigue life caused by multi-point surface crack initiation changes from crack propagation stage to crack initiation stage in the high cycle fatigue regime. Notch effect further promotes the degeneration of high cycle and very high cycle fatigue strength at R > −1. The bilinear model, extended from the Goodman method, can better estimate the mean stress sensitivity of this titanium alloy. The fatigue mean stress sensitivity and fatigue-creep mean stress sensitivity of this material increased with the increase of fatigue life. The new model, based on the Murakami model, can provide more appropriate predictions for notch fatigue strength. |
format | Online Article Text |
id | pubmed-6163757 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-61637572018-10-12 Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy Yang, Kun Zhong, Bin Huang, Qi He, Chao Huang, Zhi-Yong Wang, Qingyuan Liu, Yong-Jie Materials (Basel) Article Ultrasonic fatigue tests up to 10(10) cycles were performed on a turbine engine titanium alloy (Ti-8Al-1Mo-1V) at the stress ratio (R) of −1 with smooth specimens and at R = −1, 0.1 and 0.5 with notched specimens. As a result, with increase of fatigue life, the source of reduced fatigue life caused by multi-point surface crack initiation changes from crack propagation stage to crack initiation stage in the high cycle fatigue regime. Notch effect further promotes the degeneration of high cycle and very high cycle fatigue strength at R > −1. The bilinear model, extended from the Goodman method, can better estimate the mean stress sensitivity of this titanium alloy. The fatigue mean stress sensitivity and fatigue-creep mean stress sensitivity of this material increased with the increase of fatigue life. The new model, based on the Murakami model, can provide more appropriate predictions for notch fatigue strength. MDPI 2018-09-19 /pmc/articles/PMC6163757/ /pubmed/30235842 http://dx.doi.org/10.3390/ma11091778 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Yang, Kun Zhong, Bin Huang, Qi He, Chao Huang, Zhi-Yong Wang, Qingyuan Liu, Yong-Jie Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy |
title | Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy |
title_full | Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy |
title_fullStr | Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy |
title_full_unstemmed | Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy |
title_short | Stress Ratio and Notch Effects on the Very High Cycle Fatigue Properties of a Near-Alpha Titanium Alloy |
title_sort | stress ratio and notch effects on the very high cycle fatigue properties of a near-alpha titanium alloy |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6163757/ https://www.ncbi.nlm.nih.gov/pubmed/30235842 http://dx.doi.org/10.3390/ma11091778 |
work_keys_str_mv | AT yangkun stressratioandnotcheffectsontheveryhighcyclefatiguepropertiesofanearalphatitaniumalloy AT zhongbin stressratioandnotcheffectsontheveryhighcyclefatiguepropertiesofanearalphatitaniumalloy AT huangqi stressratioandnotcheffectsontheveryhighcyclefatiguepropertiesofanearalphatitaniumalloy AT hechao stressratioandnotcheffectsontheveryhighcyclefatiguepropertiesofanearalphatitaniumalloy AT huangzhiyong stressratioandnotcheffectsontheveryhighcyclefatiguepropertiesofanearalphatitaniumalloy AT wangqingyuan stressratioandnotcheffectsontheveryhighcyclefatiguepropertiesofanearalphatitaniumalloy AT liuyongjie stressratioandnotcheffectsontheveryhighcyclefatiguepropertiesofanearalphatitaniumalloy |