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Effect of Surface Finishing State on Fatigue Strength of Cast Aluminium and Steel Alloys

The endurance limit of structural mechanical components is affected by the residual stress state, which depends strongly on the manufacturing process. In general, compressive residual stresses tend to result in an increased fatigue strength. Post-manufacturing processes such as shot peening or vibra...

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Autores principales: Oberreiter, Matthias, Horvath, Michael, Stoschka, Michael, Fladischer, Stefan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10342587/
https://www.ncbi.nlm.nih.gov/pubmed/37445075
http://dx.doi.org/10.3390/ma16134755
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author Oberreiter, Matthias
Horvath, Michael
Stoschka, Michael
Fladischer, Stefan
author_facet Oberreiter, Matthias
Horvath, Michael
Stoschka, Michael
Fladischer, Stefan
author_sort Oberreiter, Matthias
collection PubMed
description The endurance limit of structural mechanical components is affected by the residual stress state, which depends strongly on the manufacturing process. In general, compressive residual stresses tend to result in an increased fatigue strength. Post-manufacturing processes such as shot peening or vibratory finishing may achieve such a compressive residual stress state. But within complex components, manufacturing-process-based imperfections severely limit the fatigue strength. Thus, the interactions of imperfections, residual stress state and material strength are key aspects in fatigue design. In this work, cast steel and aluminium alloys are investigated, each of them in vibratory finished and polished surface condition. A layer-based fatigue assessment concept is extended towards stable effective mean stress state considering the elastic–plastic material behaviour. Murakami’s concept was applied to incorporate the effect of hardness change and residual stress state. Residual stress relaxation is determined by elastic–plastic simulations invoking a combined hardening model. If the effective stress ratio within the local layer-based fatigue strength is evaluated as critical distance value, a sound calculation of fatigue strength can be achieved. Summing up, the layer-based fatigue strength design is extended and features an enhanced understanding of the effective stabilized mean stress state during cyclic loading.
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spelling pubmed-103425872023-07-14 Effect of Surface Finishing State on Fatigue Strength of Cast Aluminium and Steel Alloys Oberreiter, Matthias Horvath, Michael Stoschka, Michael Fladischer, Stefan Materials (Basel) Article The endurance limit of structural mechanical components is affected by the residual stress state, which depends strongly on the manufacturing process. In general, compressive residual stresses tend to result in an increased fatigue strength. Post-manufacturing processes such as shot peening or vibratory finishing may achieve such a compressive residual stress state. But within complex components, manufacturing-process-based imperfections severely limit the fatigue strength. Thus, the interactions of imperfections, residual stress state and material strength are key aspects in fatigue design. In this work, cast steel and aluminium alloys are investigated, each of them in vibratory finished and polished surface condition. A layer-based fatigue assessment concept is extended towards stable effective mean stress state considering the elastic–plastic material behaviour. Murakami’s concept was applied to incorporate the effect of hardness change and residual stress state. Residual stress relaxation is determined by elastic–plastic simulations invoking a combined hardening model. If the effective stress ratio within the local layer-based fatigue strength is evaluated as critical distance value, a sound calculation of fatigue strength can be achieved. Summing up, the layer-based fatigue strength design is extended and features an enhanced understanding of the effective stabilized mean stress state during cyclic loading. MDPI 2023-06-30 /pmc/articles/PMC10342587/ /pubmed/37445075 http://dx.doi.org/10.3390/ma16134755 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Oberreiter, Matthias
Horvath, Michael
Stoschka, Michael
Fladischer, Stefan
Effect of Surface Finishing State on Fatigue Strength of Cast Aluminium and Steel Alloys
title Effect of Surface Finishing State on Fatigue Strength of Cast Aluminium and Steel Alloys
title_full Effect of Surface Finishing State on Fatigue Strength of Cast Aluminium and Steel Alloys
title_fullStr Effect of Surface Finishing State on Fatigue Strength of Cast Aluminium and Steel Alloys
title_full_unstemmed Effect of Surface Finishing State on Fatigue Strength of Cast Aluminium and Steel Alloys
title_short Effect of Surface Finishing State on Fatigue Strength of Cast Aluminium and Steel Alloys
title_sort effect of surface finishing state on fatigue strength of cast aluminium and steel alloys
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10342587/
https://www.ncbi.nlm.nih.gov/pubmed/37445075
http://dx.doi.org/10.3390/ma16134755
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