Fatigue crack paths under the influence of changes in stiffness
An important topic of the Collaborative Research Centre TRR 30 of the Deutsche Forschungsgemeinschaft (DFG) is the crack growth behaviour in graded materials. In addition, the growth of cracks in the neighbourhood of regions and through regions with different material properties belongs under thi...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2016-02-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero35/numero_35_art_42.pdf |
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| Summary: | An important topic of the Collaborative Research Centre TRR 30 of the Deutsche
Forschungsgemeinschaft (DFG) is the crack growth behaviour in graded materials. In addition, the growth of
cracks in the neighbourhood of regions and through regions with different material properties belongs under
this topic. Due to the different material properties, regions with differing stiffness compared to the base
material may arise. Regions with differing stiffness also arise from ribs, grooves or boreholes. Since secure
findings on the propagation behaviour of fatigue cracks are essential for the evaluation of the safety of
components and structures, the growth of cracks near changes in stiffness has to be considered, too. Depending
on the way a crack penetrates the zone of influence of such a change in stiffness and depending on whether this
region is more compliant or stiffer than the surrounding area the crack may grow towards or away from this
region. Both cases result in curved crack paths that cannot be explained only by the global loading situation. To
evaluate the influence of regions with differing stiffness on the path of fatigue cracks the paths and the stress
intensity factors of cracks growing near and through regions with differing stiffness are numerically determined
with the program system ADAPCRACK3D. Therefore, arrangements of changes in stiffness modelled as
material inclusions with stiffness properties different from the base material or modelled as ribs and grooves are
systematically varied to develop basic conclusions about the crack growth behaviour near and through changes
in stiffness. |
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| ISSN: | 1971-8993 1971-8993 |