The non-proportionality of local stress paths in engineering applications
A scalar measure, which describes the non-proportionality of local stress paths in engineering applications, is introduced. For this purpose the moment of inertia approach by Meggiolaro is modified in a way that the stress time history is evaluated in a tresca-stress-space. This modification makes t...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2016-06-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://212.237.37.202/index.php/fis/article/view/1718 |
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| author | C. Riess M. Obermayr M. Vormwald |
| author_facet | C. Riess M. Obermayr M. Vormwald |
| author_sort | C. Riess |
| collection | DOAJ |
| description | A scalar measure, which describes the non-proportionality of local stress paths in engineering applications, is introduced. For this purpose the moment of inertia approach by Meggiolaro is modified in a way that the stress time history is evaluated in a tresca-stress-space. This modification makes the non-proportionality factor invariant with respect to the coordinate system. An optimization procedure is implemented to derive a test set-up for new component tests with 2 load channels. The aim of the planned tests is to get a high non-proportionality at the potential crack initiation site. It is not possible to obtain a high non-proportionality factor at the failure location without selective weakening of the component (housing of a rear axle steering). Therefore specific areas of the structure are cut out and the optimization procedure is repeated. As a result of the optimization a test set-up with high local non-proportionality at the potential crack initiation site is achieved for the weakened structure. Another set-up with slightly less non-proportionality but with a very localized damage is derived. This set-up is preferred, because of the robustness in the physical test. |
| format | Article |
| id | doaj-art-3043897011454222817729f5c0d00be7 |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2016-06-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-3043897011454222817729f5c0d00be72025-01-03T00:40:23ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932016-06-011037The non-proportionality of local stress paths in engineering applicationsC. Riess0M. Obermayr1M. Vormwald2ZF Friedrichshafen AGZF Friedrichshafen AGTechnische Universität DarmstadtA scalar measure, which describes the non-proportionality of local stress paths in engineering applications, is introduced. For this purpose the moment of inertia approach by Meggiolaro is modified in a way that the stress time history is evaluated in a tresca-stress-space. This modification makes the non-proportionality factor invariant with respect to the coordinate system. An optimization procedure is implemented to derive a test set-up for new component tests with 2 load channels. The aim of the planned tests is to get a high non-proportionality at the potential crack initiation site. It is not possible to obtain a high non-proportionality factor at the failure location without selective weakening of the component (housing of a rear axle steering). Therefore specific areas of the structure are cut out and the optimization procedure is repeated. As a result of the optimization a test set-up with high local non-proportionality at the potential crack initiation site is achieved for the weakened structure. Another set-up with slightly less non-proportionality but with a very localized damage is derived. This set-up is preferred, because of the robustness in the physical test.https://212.237.37.202/index.php/fis/article/view/1718Non-proportional fatigueMultiaxial testing |
| spellingShingle | C. Riess M. Obermayr M. Vormwald The non-proportionality of local stress paths in engineering applications Fracture and Structural Integrity Non-proportional fatigue Multiaxial testing |
| title | The non-proportionality of local stress paths in engineering applications |
| title_full | The non-proportionality of local stress paths in engineering applications |
| title_fullStr | The non-proportionality of local stress paths in engineering applications |
| title_full_unstemmed | The non-proportionality of local stress paths in engineering applications |
| title_short | The non-proportionality of local stress paths in engineering applications |
| title_sort | non proportionality of local stress paths in engineering applications |
| topic | Non-proportional fatigue Multiaxial testing |
| url | https://212.237.37.202/index.php/fis/article/view/1718 |
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