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Joris Degrieck - One of the best experts on this subject based on the ideXlab platform.
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THE USE OF HAT-Shaped SpecimenS FOR DYNAMIC SHEAR TESTING
Foundations of Civil and Environmental Engineering, 2020Co-Authors: Jan Peirs, Patricia Verleysen, Joris DegrieckAbstract:In recent decades, Specimens with hat-Shaped geometry have been used to study materials with respect to their shear behavior incl uding strain localization and adiabatic shear banding (ASB). However, the interpretation of the experimental results is still not straightforward because of the complex stress distr ibution in the shear region of the Specimen. More comprehensive use of the hat-Shaped Specimen is possible when a better description of the distribution and evolution of th e stress state in the Specimen is available. This paper presents the results of dynamic and stat ic experiments on Ti-6Al-4V and numerical simulations in ABAQUS/Explicit. The stress, strain and temperature distribution and evolution is examined for Specimens with varying dimensions. The aim is to identify the important factors that affect the expe rimental results.
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on the tension tension fatigue behaviour of a carbon reinforced thermoplastic part ii evaluation of a dumbbell Shaped Specimen
Polymer Testing, 2011Co-Authors: I De Baere, W Van Paepegem, Christian Hochard, Joris DegrieckAbstract:For performing uni-axial fatigue tests on composite materials, ASTM D3479/D3479M Standard Test Method for Tension–Tension Fatigue of Polymer Matrix Composite Materials is often considered. This standard prescribes a rectangular Shaped Specimen with end tabs. However, in part I of this study it became clear that for some materials, such as the carbon PPS under study, the proposed geometry is not ideal for fatigue tests. In this manuscript, a dumbbell (dogbone) shape is assessed to see whether it performs better under fatigue loading conditions, primarily meaning that failure does not occur in the tabbed section. The shape is first optimised using finite element modelling, after which fatigue experiments are performed. It may be concluded, for the material under study, that the dumbbell shape is preferable to rectangular since failure never occurred under or near the tabbed section, and fatigue life is highly underestimated when using the rectangular Specimen.
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On the tension–tension fatigue behaviour of a carbon reinforced thermoplastic part II: Evaluation of a dumbbell-Shaped Specimen
Polymer Testing, 2011Co-Authors: I De Baere, W Van Paepegem, Christian Hochard, Joris DegrieckAbstract:For performing uni-axial fatigue tests on composite materials, ASTM D3479/D3479M Standard Test Method for Tension–Tension Fatigue of Polymer Matrix Composite Materials is often considered. This standard prescribes a rectangular Shaped Specimen with end tabs. However, in part I of this study it became clear that for some materials, such as the carbon PPS under study, the proposed geometry is not ideal for fatigue tests. In this manuscript, a dumbbell (dogbone) shape is assessed to see whether it performs better under fatigue loading conditions, primarily meaning that failure does not occur in the tabbed section. The shape is first optimised using finite element modelling, after which fatigue experiments are performed. It may be concluded, for the material under study, that the dumbbell shape is preferable to rectangular since failure never occurred under or near the tabbed section, and fatigue life is highly underestimated when using the rectangular Specimen.
I De Baere - One of the best experts on this subject based on the ideXlab platform.
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on the tension tension fatigue behaviour of a carbon reinforced thermoplastic part ii evaluation of a dumbbell Shaped Specimen
Polymer Testing, 2011Co-Authors: I De Baere, W Van Paepegem, Christian Hochard, Joris DegrieckAbstract:For performing uni-axial fatigue tests on composite materials, ASTM D3479/D3479M Standard Test Method for Tension–Tension Fatigue of Polymer Matrix Composite Materials is often considered. This standard prescribes a rectangular Shaped Specimen with end tabs. However, in part I of this study it became clear that for some materials, such as the carbon PPS under study, the proposed geometry is not ideal for fatigue tests. In this manuscript, a dumbbell (dogbone) shape is assessed to see whether it performs better under fatigue loading conditions, primarily meaning that failure does not occur in the tabbed section. The shape is first optimised using finite element modelling, after which fatigue experiments are performed. It may be concluded, for the material under study, that the dumbbell shape is preferable to rectangular since failure never occurred under or near the tabbed section, and fatigue life is highly underestimated when using the rectangular Specimen.
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On the tension–tension fatigue behaviour of a carbon reinforced thermoplastic part II: Evaluation of a dumbbell-Shaped Specimen
Polymer Testing, 2011Co-Authors: I De Baere, W Van Paepegem, Christian Hochard, Joris DegrieckAbstract:For performing uni-axial fatigue tests on composite materials, ASTM D3479/D3479M Standard Test Method for Tension–Tension Fatigue of Polymer Matrix Composite Materials is often considered. This standard prescribes a rectangular Shaped Specimen with end tabs. However, in part I of this study it became clear that for some materials, such as the carbon PPS under study, the proposed geometry is not ideal for fatigue tests. In this manuscript, a dumbbell (dogbone) shape is assessed to see whether it performs better under fatigue loading conditions, primarily meaning that failure does not occur in the tabbed section. The shape is first optimised using finite element modelling, after which fatigue experiments are performed. It may be concluded, for the material under study, that the dumbbell shape is preferable to rectangular since failure never occurred under or near the tabbed section, and fatigue life is highly underestimated when using the rectangular Specimen.
Q M Zhang - One of the best experts on this subject based on the ideXlab platform.
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electron backscatter diffraction analysis of strain distribution in adiabatic shear band and its nearby area in ti 3al 5mo 4 5v alloy
Materials Science and Technology, 2012Co-Authors: Yuling Yang, Fang Jiang, M Yang, X M Li, Hui Zheng, Q M ZhangAbstract:Adiabatic shear bands (ASBs) were produced in the hat Shaped Specimen of Ti–3Al–5Mo–4·5V alloy by split Hopkinson pressure bar technique. Strain distribution in the ASB and its nearby area was investigated by electron backscatter diffraction technology. Image quality, confidential index and Fit value treated as strain sensitive parameters are applied to evaluate the strain field in the present study. The results show that the region including the ASB and its nearby area can be divided into three parts according to the strain gradient. The first part is the area of the ASB, which has the largest strain in the whole region; the second part is the area within ∼2 μm on both sides of the ASB, where the strain is second only to the ASB area; and the last part is far from the ASB area, and the strain there is the smallest. In addition, further analysis reveals that the initiation and propagation of the microcrack could occur more likely in the ASB area than in the other areas.
Youwen Yang - One of the best experts on this subject based on the ideXlab platform.
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microstructure evolution in adiabatic shear band in fine grain sized ti 3al 5mo 4 5v alloy
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2008Co-Authors: Bin Wang, Youwen YangAbstract:Abstract Dynamic testing of Ti–3Al–5Mo–4.5V (TC16) alloy was carried out in a hat-Shaped Specimen by a split Hopkinson pressure bar (SHPB) at ambient temperature. The microstructure and phase transformation in adiabatic shear band (ASB) produced in TC16 alloy were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). ASB in TC16 alloy is a “white” band of width about 13 μm. The elongated cell structures of width about 0.2–0.5 μm with thick dislocation exist in the boundary of the shear band. Results suggest that the fine equiaxed grains with α-phase and α″-phase coexist in the shear band. The “white” band is a transformation band. Calculation indicates that the maximum temperature within ASB is about 1069 K. The phase transformation and the microstructure evolution within ASB in TC16 alloy are explained.
Christian Hochard - One of the best experts on this subject based on the ideXlab platform.
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on the tension tension fatigue behaviour of a carbon reinforced thermoplastic part ii evaluation of a dumbbell Shaped Specimen
Polymer Testing, 2011Co-Authors: I De Baere, W Van Paepegem, Christian Hochard, Joris DegrieckAbstract:For performing uni-axial fatigue tests on composite materials, ASTM D3479/D3479M Standard Test Method for Tension–Tension Fatigue of Polymer Matrix Composite Materials is often considered. This standard prescribes a rectangular Shaped Specimen with end tabs. However, in part I of this study it became clear that for some materials, such as the carbon PPS under study, the proposed geometry is not ideal for fatigue tests. In this manuscript, a dumbbell (dogbone) shape is assessed to see whether it performs better under fatigue loading conditions, primarily meaning that failure does not occur in the tabbed section. The shape is first optimised using finite element modelling, after which fatigue experiments are performed. It may be concluded, for the material under study, that the dumbbell shape is preferable to rectangular since failure never occurred under or near the tabbed section, and fatigue life is highly underestimated when using the rectangular Specimen.
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On the tension–tension fatigue behaviour of a carbon reinforced thermoplastic part II: Evaluation of a dumbbell-Shaped Specimen
Polymer Testing, 2011Co-Authors: I De Baere, W Van Paepegem, Christian Hochard, Joris DegrieckAbstract:For performing uni-axial fatigue tests on composite materials, ASTM D3479/D3479M Standard Test Method for Tension–Tension Fatigue of Polymer Matrix Composite Materials is often considered. This standard prescribes a rectangular Shaped Specimen with end tabs. However, in part I of this study it became clear that for some materials, such as the carbon PPS under study, the proposed geometry is not ideal for fatigue tests. In this manuscript, a dumbbell (dogbone) shape is assessed to see whether it performs better under fatigue loading conditions, primarily meaning that failure does not occur in the tabbed section. The shape is first optimised using finite element modelling, after which fatigue experiments are performed. It may be concluded, for the material under study, that the dumbbell shape is preferable to rectangular since failure never occurred under or near the tabbed section, and fatigue life is highly underestimated when using the rectangular Specimen.