Surface crack growth subject to bending and biaxial tension-compression
Fatigue surface crack growth and the in-plane and out-of-plane constraint effects are studied through experiments and computations for aluminium alloy D16T. Subjects for studies are cruciform specimens under different biaxial loading and bending central notched specimens with external semi-ellipti...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2016-01-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero35/numero_35_art_14.pdf |
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| Summary: | Fatigue surface crack growth and the in-plane and out-of-plane constraint effects are studied
through experiments and computations for aluminium alloy D16T. Subjects for studies are cruciform specimens
under different biaxial loading and bending central notched specimens with external semi-elliptical surface
crack. Both the optical microscope measurements and the crack opening displacement (COD) method are used
to monitor and calculate both crack depth and crack length during the tests. The variation of crack growth rate
and surface crack paths behaviour is studied under cyclic pure bending and biaxial tension-compression fatigue
loading. This work is centered on the relations between crack size on the free surface of specimen considered
configurations, COD and aspect ratio under different fatigue loading conditions. For the experimental surface
crack paths in tested specimens the T-stress, the local triaxiality parameter h, the out-of-plane TZ factor and the
governing parameter for the 3D-fields of the stresses and strains at the crack tip in the form of In-integral were
calculated as a function of aspect ratio by finite element analysis to characterization of the constraint effects
along semi-elliptical crack front. The plastic stress intensity factor approach is applied to the fatigue crack
growth on the free surface of the tested bending and cruciform specimens as well as the deepest point of the
semi-elliptical surface crack front. As result fatigue surface crack paths or crack front positions as a function of
accumulated number of cycle of loading are obtained. |
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| ISSN: | 1971-8993 1971-8993 |