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...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2016-07-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero37/numero_37_art_08.pdf |
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| _version_ | 1841564391813677056 |
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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-65371362cc6849d3b9913df6f630506d |
| institution | Kabale University |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2016-07-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-65371362cc6849d3b9913df6f630506d2025-01-02T22:45:28ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932016-07-011037525910.3221/IGF-ESIS37.08The non-proportionality of local stress paths in engineering applicationsC. Riess0M. Obermayr1M. Vormwald2Friedrichshafen, GermanyFriedrichshafen, GermanyTechnische Universität Darmstadt,GermanyA 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.http://www.gruppofrattura.it/pdf/rivista/numero37/numero_37_art_08.pdfNon-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 | http://www.gruppofrattura.it/pdf/rivista/numero37/numero_37_art_08.pdf |
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