Finite element modeling and experimental studies on mixed mode-I/III fracture specimens
In this study, finite element modeling and experimental studies on a mode-I/III specimen similar to the compact tension specimen are presented. By using bolts, the specimen is attached to two loading apparatus that allow different levels of mode-I/III loading by changing the loading holes. Specime...
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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_40.pdf |
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| Summary: | In this study, finite element modeling and experimental studies on a mode-I/III specimen similar to
the compact tension specimen are presented. By using bolts, the specimen is attached to two loading apparatus
that allow different levels of mode-I/III loading by changing the loading holes. Specimens having two different
thicknesses are analyzed and tested. Modeling, meshing and the solution of the problem involving the whole
assembly, i.e., loading devices, bolts and the specimen, with contact mechanics are performed using ANSYSTM.
Then, the mode-I/III specimen is analyzed separately using a submodeling approach, in which threedimensional
enriched finite elements are used in FRAC3D solver to calculate the resulting stress intensity
factors along the crack front. In all of the analyses, it is clearly shown that although the loading is in the mode-I
and III directions, mode-II stress intensity factors coupled with mode-III are also generated due to rotational
relative deformations of crack surfaces. The results show that the mode-II stress intensity factors change sign
along the crack front and their magnitudes are close to the mode-III stress intensity factors. It is also seen that
magnitudes of the mode-III stress intensity factors do not vary much along the crack front. Fracture
experiments also performed and, using the stress intensity factors from the analyses and crack paths and
surfaces are shown. |
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| ISSN: | 1971-8993 1971-8993 |