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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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2016-07-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero37/numero_37_art_08.pdf |
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| Summary: | 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. |
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| ISSN: | 1971-8993 1971-8993 |