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Remaining Life Assessment for Steel After Low-Cycle Fatigue by Surface Crack Image
After pre-fatigue cycles at different strain amplitudes with different N/N(f) values (33.3%, 50%, and 75%), specimens of HRB335 steel were subjected to uniaxial tension until failure. By this method the mechanical properties of the specimens after pre-fatigue testing were measured, and the fracture...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6427471/ https://www.ncbi.nlm.nih.gov/pubmed/30862079 http://dx.doi.org/10.3390/ma12050823 |
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author | Shi, Che-Si Zeng, Bin Liu, Gui-Long Zhang, Ke-Shi |
author_facet | Shi, Che-Si Zeng, Bin Liu, Gui-Long Zhang, Ke-Shi |
author_sort | Shi, Che-Si |
collection | PubMed |
description | After pre-fatigue cycles at different strain amplitudes with different N/N(f) values (33.3%, 50%, and 75%), specimens of HRB335 steel were subjected to uniaxial tension until failure. By this method the mechanical properties of the specimens after pre-fatigue testing were measured, and the fracture morphology and microscopic morphology in the vicinity of the specimen’s neck surface near the fracture were observed. The verification of the characteristics to be used to estimate the damage caused during the loading cycles was conducted. By observing optical microscope images of the surface area near the neck of the specimens, it was found that the images of surface cracks were significantly different and strongly depended on the number of pre-fatigue cycles the specimen had undergone. In response to this phenomenon, both the microscopic images taken directly from the photos of the surface crack distribution and the binary images based on them were statistically analyzed, and then a parameter, S, denoted as the “unit crack area”, characterizing the cumulative fatigue damage was suggested. Furthermore, the test procedure and the calculation formula for determining the image parameters were summarized, and a method for evaluating the remaining life of steel after low-cycles of reversed tension and compression was proposed. |
format | Online Article Text |
id | pubmed-6427471 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-64274712019-04-15 Remaining Life Assessment for Steel After Low-Cycle Fatigue by Surface Crack Image Shi, Che-Si Zeng, Bin Liu, Gui-Long Zhang, Ke-Shi Materials (Basel) Article After pre-fatigue cycles at different strain amplitudes with different N/N(f) values (33.3%, 50%, and 75%), specimens of HRB335 steel were subjected to uniaxial tension until failure. By this method the mechanical properties of the specimens after pre-fatigue testing were measured, and the fracture morphology and microscopic morphology in the vicinity of the specimen’s neck surface near the fracture were observed. The verification of the characteristics to be used to estimate the damage caused during the loading cycles was conducted. By observing optical microscope images of the surface area near the neck of the specimens, it was found that the images of surface cracks were significantly different and strongly depended on the number of pre-fatigue cycles the specimen had undergone. In response to this phenomenon, both the microscopic images taken directly from the photos of the surface crack distribution and the binary images based on them were statistically analyzed, and then a parameter, S, denoted as the “unit crack area”, characterizing the cumulative fatigue damage was suggested. Furthermore, the test procedure and the calculation formula for determining the image parameters were summarized, and a method for evaluating the remaining life of steel after low-cycles of reversed tension and compression was proposed. MDPI 2019-03-11 /pmc/articles/PMC6427471/ /pubmed/30862079 http://dx.doi.org/10.3390/ma12050823 Text en © 2019 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 Shi, Che-Si Zeng, Bin Liu, Gui-Long Zhang, Ke-Shi Remaining Life Assessment for Steel After Low-Cycle Fatigue by Surface Crack Image |
title | Remaining Life Assessment for Steel After Low-Cycle Fatigue by Surface Crack Image |
title_full | Remaining Life Assessment for Steel After Low-Cycle Fatigue by Surface Crack Image |
title_fullStr | Remaining Life Assessment for Steel After Low-Cycle Fatigue by Surface Crack Image |
title_full_unstemmed | Remaining Life Assessment for Steel After Low-Cycle Fatigue by Surface Crack Image |
title_short | Remaining Life Assessment for Steel After Low-Cycle Fatigue by Surface Crack Image |
title_sort | remaining life assessment for steel after low-cycle fatigue by surface crack image |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6427471/ https://www.ncbi.nlm.nih.gov/pubmed/30862079 http://dx.doi.org/10.3390/ma12050823 |
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