Critical length parameter of HDPE and its use in fatigue lifetime predictions
The contribution describes the fatigue lifetime predictions of polyethylene notched specimens based on the theory of critical distance. The approach uses the line method, which averages the axial stress over the critical distance. The critical distance is determined from experimental data of Cracke...
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Gruppo Italiano Frattura
2024-11-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://fracturae.com/index.php/fis/article/view/5211 |
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| author | Kamila Kozáková Lukáš Trávníček Jan Poduška Jan Klusák |
| author_facet | Kamila Kozáková Lukáš Trávníček Jan Poduška Jan Klusák |
| author_sort | Kamila Kozáková |
| collection | DOAJ |
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The contribution describes the fatigue lifetime predictions of polyethylene notched specimens based on the theory of critical distance. The approach uses the line method, which averages the axial stress over the critical distance. The critical distance is determined from experimental data of Cracked Round Bar (CRB) specimens and specimens with a model notch. From these two sets of experimental fatigue data and corresponding axial stress distributions, the critical distance is determined. The critical distance depends on the number of cycles to failure and notch radius. For this reason, the critical distance is modified by the ratio of stress concentration factors and the modified distance is used for fatigue lifetime predictions of notched specimens with various notch radii. Using this approach significant savings in testing time can be achieved. CRB fatigue tests are commonly used tests for ranking PE pipe grades and are easily available. Adding the fatigue tests of notched specimens with a model notch, the critical parameter can be found, and fatigue lifetime predictions of various notches can be calculated.
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| format | Article |
| id | doaj-art-f96b276b953c489b91d3b248db9e1f72 |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-f96b276b953c489b91d3b248db9e1f722025-02-07T06:12:25ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932024-11-011971Critical length parameter of HDPE and its use in fatigue lifetime predictionsKamila Kozáková0https://orcid.org/0000-0002-0178-8536Lukáš Trávníček1https://orcid.org/0000-0001-7173-427XJan Poduška2https://orcid.org/0000-0002-5320-4854Jan Klusák3https://orcid.org/0000-0002-5422-4793Faculty of Mechanical Engineering, Brno University of Technology, Technická 289/2, 616 69 Brno, Czech Republic; Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 513/22, 616 00 Brno, Czech RepublicMaterials Science and Testing of Polymers, Montanuniversität Leoben, Otto Glöckel-Strasse 2, 8700 Leoben, Austria Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 513/22, 616 00 Brno, Czech RepublicInstitute of Physics of Materials, Czech Academy of Sciences, Žižkova 513/22, 616 00 Brno, Czech Republic The contribution describes the fatigue lifetime predictions of polyethylene notched specimens based on the theory of critical distance. The approach uses the line method, which averages the axial stress over the critical distance. The critical distance is determined from experimental data of Cracked Round Bar (CRB) specimens and specimens with a model notch. From these two sets of experimental fatigue data and corresponding axial stress distributions, the critical distance is determined. The critical distance depends on the number of cycles to failure and notch radius. For this reason, the critical distance is modified by the ratio of stress concentration factors and the modified distance is used for fatigue lifetime predictions of notched specimens with various notch radii. Using this approach significant savings in testing time can be achieved. CRB fatigue tests are commonly used tests for ranking PE pipe grades and are easily available. Adding the fatigue tests of notched specimens with a model notch, the critical parameter can be found, and fatigue lifetime predictions of various notches can be calculated. https://fracturae.com/index.php/fis/article/view/5211Polyethylenetheory of critical distancesnotchesCRB testsfatigue lifetime predictions |
| spellingShingle | Kamila Kozáková Lukáš Trávníček Jan Poduška Jan Klusák Critical length parameter of HDPE and its use in fatigue lifetime predictions Fracture and Structural Integrity Polyethylene theory of critical distances notches CRB tests fatigue lifetime predictions |
| title | Critical length parameter of HDPE and its use in fatigue lifetime predictions |
| title_full | Critical length parameter of HDPE and its use in fatigue lifetime predictions |
| title_fullStr | Critical length parameter of HDPE and its use in fatigue lifetime predictions |
| title_full_unstemmed | Critical length parameter of HDPE and its use in fatigue lifetime predictions |
| title_short | Critical length parameter of HDPE and its use in fatigue lifetime predictions |
| title_sort | critical length parameter of hdpe and its use in fatigue lifetime predictions |
| topic | Polyethylene theory of critical distances notches CRB tests fatigue lifetime predictions |
| url | https://fracturae.com/index.php/fis/article/view/5211 |
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