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Application of a New, Energy-Based ΔS* Crack Driving Force for Fatigue Crack Growth Rate Description
This paper presents the problem of the description of fatigue cracking development in metallic constructional materials. Fatigue crack growth models (mostly empirical) are usually constructed using a stress intensity factor ΔK in linear-elastic fracture mechanics. Contrary to the kinetic fatigue fra...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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MDPI
2019
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6384631/ https://www.ncbi.nlm.nih.gov/pubmed/30744085 http://dx.doi.org/10.3390/ma12030518 |
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author | Lesiuk, Grzegorz |
author_facet | Lesiuk, Grzegorz |
author_sort | Lesiuk, Grzegorz |
collection | PubMed |
description | This paper presents the problem of the description of fatigue cracking development in metallic constructional materials. Fatigue crack growth models (mostly empirical) are usually constructed using a stress intensity factor ΔK in linear-elastic fracture mechanics. Contrary to the kinetic fatigue fracture diagrams (KFFDs) based on stress intensity factor K, new energy KFFDs show no sensitivity to mean stress effect expressed by the stress ratio R. However, in the literature there is a lack of analytical description and interpretation of this parameter in order to promote this approach in engineering practice. Therefore, based on a dimensional analysis approach, ΔH is replaced by elastic-plastic fracture mechanics parameter—the ΔJ-integral range. In this case, the invariance from stress is not clear. Hence, the main goal of this paper is the application of the new averaged (geometrically) strain energy density parameter ΔS* based on the relationship of the maximal value of J integral and its range ΔJ. The usefulness and invariance of this parameter have been confirmed for three different metallic materials, 10HNAP, 18G2A, and 19th century puddle iron from the Eiffel bridge. |
format | Online Article Text |
id | pubmed-6384631 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-63846312019-02-23 Application of a New, Energy-Based ΔS* Crack Driving Force for Fatigue Crack Growth Rate Description Lesiuk, Grzegorz Materials (Basel) Article This paper presents the problem of the description of fatigue cracking development in metallic constructional materials. Fatigue crack growth models (mostly empirical) are usually constructed using a stress intensity factor ΔK in linear-elastic fracture mechanics. Contrary to the kinetic fatigue fracture diagrams (KFFDs) based on stress intensity factor K, new energy KFFDs show no sensitivity to mean stress effect expressed by the stress ratio R. However, in the literature there is a lack of analytical description and interpretation of this parameter in order to promote this approach in engineering practice. Therefore, based on a dimensional analysis approach, ΔH is replaced by elastic-plastic fracture mechanics parameter—the ΔJ-integral range. In this case, the invariance from stress is not clear. Hence, the main goal of this paper is the application of the new averaged (geometrically) strain energy density parameter ΔS* based on the relationship of the maximal value of J integral and its range ΔJ. The usefulness and invariance of this parameter have been confirmed for three different metallic materials, 10HNAP, 18G2A, and 19th century puddle iron from the Eiffel bridge. MDPI 2019-02-09 /pmc/articles/PMC6384631/ /pubmed/30744085 http://dx.doi.org/10.3390/ma12030518 Text en © 2019 by the author. 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 Lesiuk, Grzegorz Application of a New, Energy-Based ΔS* Crack Driving Force for Fatigue Crack Growth Rate Description |
title | Application of a New, Energy-Based ΔS* Crack Driving Force for Fatigue Crack Growth Rate Description |
title_full | Application of a New, Energy-Based ΔS* Crack Driving Force for Fatigue Crack Growth Rate Description |
title_fullStr | Application of a New, Energy-Based ΔS* Crack Driving Force for Fatigue Crack Growth Rate Description |
title_full_unstemmed | Application of a New, Energy-Based ΔS* Crack Driving Force for Fatigue Crack Growth Rate Description |
title_short | Application of a New, Energy-Based ΔS* Crack Driving Force for Fatigue Crack Growth Rate Description |
title_sort | application of a new, energy-based δs* crack driving force for fatigue crack growth rate description |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6384631/ https://www.ncbi.nlm.nih.gov/pubmed/30744085 http://dx.doi.org/10.3390/ma12030518 |
work_keys_str_mv | AT lesiukgrzegorz applicationofanewenergybaseddscrackdrivingforceforfatiguecrackgrowthratedescription |