Abstract
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.
Highlights
M ajority of fracture mechanics problems seen in practice are type of mode-I
Results of Finite Element Models In this subsection, results from mode-I/III fracture analyses are presented for different loading angles and different specimen thicknesses
Overall view of the experimental set-up and the equipment used is shown. As seen from this figure, the test assembly consists of the mode-I/III compact tension tearing (CTT) specimen (Al 7075-T651), the loading apparatus (St 4140), the pins (HSS), the bolts and two cameras that monitor and record the crack tips on the front and back specimen surfaces
Summary
M ajority of fracture mechanics problems seen in practice are type of mode-I. there are still many problems that include mixed mode loading. H.A Richard et al investigate 2D - 3D mixed mode crack problems and compared the fracture criteria [1]. Ayatollahi et al presented a loading fixture for mode-I/III experimental study [2].
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