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Theodore E. Matikas - One of the best experts on this subject based on the ideXlab platform.
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cyclic loading of a sic fiber reinforced ceramic matrix composite reveals damage mechanisms and thermal residual stress state
Composites Part A-applied Science and Manufacturing, 2013Co-Authors: Konstantinos G Dassios, Evangelos Z. Kordatos, Dimitrios G Aggelis, Theodore E. MatikasAbstract:Abstract This study reports on the effects of axial thermal residual stresses, cyclic loading and presence of notches on the tensile performance of a SiC-fiber-reinforced barium–magnesium–alumina–silicate (BMAS) ceramic matrix composite. The residual stress state of the composite was experimentally measured by interrogation of the tensile curves at a uniquely well-defined common intersection point of unloading–reloading cycles in the tensile domain. Notch presence was critical on the material’s mechanical response and promoted catastrophic failure shortly after the achievement of a saturated matrix crack state. The result of cyclic loading was an increase by 20% in sustainable stress throughout loading, as compared to pure tension. Scatter in elastic properties within specimens of different notch-to-width ratios was reconciled with theoretical expectations by application of a translation vector approach in the stress–Strain Plane, based on the material’s residual stress state. Acoustic emission and infrared thermography provided valuable insight into damage identification, location and sequence.
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Damage Assessment in a SiC-fiber reinforced Ceramic Matrix Composite
Journal of Engineering, 2013Co-Authors: Konstantinos G Dassios, Theodore E. MatikasAbstract:Assessment of the fracture behavior of a SiC-fbre-reinforced barium osumilite (BMAS) ceramic matrix composite tested under static and cyclic tension conditions is reported herein. Notched specimens were used in order to limit material damage within a predefined gauge length. Imposition of successive unloading/reloading loops was found to result in an increase by 20% in material strength as compared to pure tension; the observed increase is attributed to energy dissipation from large-scale interfacial debonding phenomena that dominated the post-elastic tensile behaviour of the composite. Cyclic loading also helped establish the axial residual stress state of the fibres in the composite of tensile nature via a well-defined common intersection point of unloading-reloading cycles. A translation vector approach in the stress-Strain Plane was successful in establishing the residual stress-free properties of the composite and in reconciling the scatter noted in elastic properties of specimens with respect to theoretical expectations.
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Large-scale interfacial damage and residual stresses in a glass–ceramic matrix composite
Composite Interfaces, 2012Co-Authors: Konstantinos G Dassios, Theodore E. MatikasAbstract:The current work is concerned with the micro-mechanics of fracture of a SiC-fiber-reinforced barium osumilite (BMAS) ceramic matrix composite tested under both monotonic and cyclic tension. The double-edge notch (DEN) specimen configuration was employed in order to confine material damage within a predefined gage length. The imposition of successive loops of unloading to complete load relaxation and subsequent reloading were found to result in an increase by 20% in material strength as compared to pure tension; the finding is attributed to energy dissipation from large-scale interfacial debonding phenomena that dominated the post-elastic mechanical behavior of the composite. Cyclic loading also helped establish the axial residual stress state of the fibers in the composite, of tensile nature, via a well-defined common intersection point of unloading–reloading cycles. An approach consisting of the application of a translation vector in the stress–Strain Plane was successfully used to derive the residual st...
Konstantinos G Dassios - One of the best experts on this subject based on the ideXlab platform.
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cyclic loading of a sic fiber reinforced ceramic matrix composite reveals damage mechanisms and thermal residual stress state
Composites Part A-applied Science and Manufacturing, 2013Co-Authors: Konstantinos G Dassios, Evangelos Z. Kordatos, Dimitrios G Aggelis, Theodore E. MatikasAbstract:Abstract This study reports on the effects of axial thermal residual stresses, cyclic loading and presence of notches on the tensile performance of a SiC-fiber-reinforced barium–magnesium–alumina–silicate (BMAS) ceramic matrix composite. The residual stress state of the composite was experimentally measured by interrogation of the tensile curves at a uniquely well-defined common intersection point of unloading–reloading cycles in the tensile domain. Notch presence was critical on the material’s mechanical response and promoted catastrophic failure shortly after the achievement of a saturated matrix crack state. The result of cyclic loading was an increase by 20% in sustainable stress throughout loading, as compared to pure tension. Scatter in elastic properties within specimens of different notch-to-width ratios was reconciled with theoretical expectations by application of a translation vector approach in the stress–Strain Plane, based on the material’s residual stress state. Acoustic emission and infrared thermography provided valuable insight into damage identification, location and sequence.
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Damage Assessment in a SiC-fiber reinforced Ceramic Matrix Composite
Journal of Engineering, 2013Co-Authors: Konstantinos G Dassios, Theodore E. MatikasAbstract:Assessment of the fracture behavior of a SiC-fbre-reinforced barium osumilite (BMAS) ceramic matrix composite tested under static and cyclic tension conditions is reported herein. Notched specimens were used in order to limit material damage within a predefined gauge length. Imposition of successive unloading/reloading loops was found to result in an increase by 20% in material strength as compared to pure tension; the observed increase is attributed to energy dissipation from large-scale interfacial debonding phenomena that dominated the post-elastic tensile behaviour of the composite. Cyclic loading also helped establish the axial residual stress state of the fibres in the composite of tensile nature via a well-defined common intersection point of unloading-reloading cycles. A translation vector approach in the stress-Strain Plane was successful in establishing the residual stress-free properties of the composite and in reconciling the scatter noted in elastic properties of specimens with respect to theoretical expectations.
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Large-scale interfacial damage and residual stresses in a glass–ceramic matrix composite
Composite Interfaces, 2012Co-Authors: Konstantinos G Dassios, Theodore E. MatikasAbstract:The current work is concerned with the micro-mechanics of fracture of a SiC-fiber-reinforced barium osumilite (BMAS) ceramic matrix composite tested under both monotonic and cyclic tension. The double-edge notch (DEN) specimen configuration was employed in order to confine material damage within a predefined gage length. The imposition of successive loops of unloading to complete load relaxation and subsequent reloading were found to result in an increase by 20% in material strength as compared to pure tension; the finding is attributed to energy dissipation from large-scale interfacial debonding phenomena that dominated the post-elastic mechanical behavior of the composite. Cyclic loading also helped establish the axial residual stress state of the fibers in the composite, of tensile nature, via a well-defined common intersection point of unloading–reloading cycles. An approach consisting of the application of a translation vector in the stress–Strain Plane was successfully used to derive the residual st...
Dimitrios G Aggelis - One of the best experts on this subject based on the ideXlab platform.
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cyclic loading of a sic fiber reinforced ceramic matrix composite reveals damage mechanisms and thermal residual stress state
Composites Part A-applied Science and Manufacturing, 2013Co-Authors: Konstantinos G Dassios, Evangelos Z. Kordatos, Dimitrios G Aggelis, Theodore E. MatikasAbstract:Abstract This study reports on the effects of axial thermal residual stresses, cyclic loading and presence of notches on the tensile performance of a SiC-fiber-reinforced barium–magnesium–alumina–silicate (BMAS) ceramic matrix composite. The residual stress state of the composite was experimentally measured by interrogation of the tensile curves at a uniquely well-defined common intersection point of unloading–reloading cycles in the tensile domain. Notch presence was critical on the material’s mechanical response and promoted catastrophic failure shortly after the achievement of a saturated matrix crack state. The result of cyclic loading was an increase by 20% in sustainable stress throughout loading, as compared to pure tension. Scatter in elastic properties within specimens of different notch-to-width ratios was reconciled with theoretical expectations by application of a translation vector approach in the stress–Strain Plane, based on the material’s residual stress state. Acoustic emission and infrared thermography provided valuable insight into damage identification, location and sequence.
Evangelos Z. Kordatos - One of the best experts on this subject based on the ideXlab platform.
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cyclic loading of a sic fiber reinforced ceramic matrix composite reveals damage mechanisms and thermal residual stress state
Composites Part A-applied Science and Manufacturing, 2013Co-Authors: Konstantinos G Dassios, Evangelos Z. Kordatos, Dimitrios G Aggelis, Theodore E. MatikasAbstract:Abstract This study reports on the effects of axial thermal residual stresses, cyclic loading and presence of notches on the tensile performance of a SiC-fiber-reinforced barium–magnesium–alumina–silicate (BMAS) ceramic matrix composite. The residual stress state of the composite was experimentally measured by interrogation of the tensile curves at a uniquely well-defined common intersection point of unloading–reloading cycles in the tensile domain. Notch presence was critical on the material’s mechanical response and promoted catastrophic failure shortly after the achievement of a saturated matrix crack state. The result of cyclic loading was an increase by 20% in sustainable stress throughout loading, as compared to pure tension. Scatter in elastic properties within specimens of different notch-to-width ratios was reconciled with theoretical expectations by application of a translation vector approach in the stress–Strain Plane, based on the material’s residual stress state. Acoustic emission and infrared thermography provided valuable insight into damage identification, location and sequence.
Sylvain Barbot - One of the best experts on this subject based on the ideXlab platform.
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Deformation of a half‐space from anelastic Strain confined in a tetrahedral volume
Bulletin of the Seismological Society of America, 2018Co-Authors: Sylvain BarbotAbstract:Deformation in the lithosphere-asthenosphere system can be accommodated by faulting and plastic flow. However, incorporating structural data in models of distributed deformation still represents a challenge. Here, I present solutions for the displacements and stress in a half-space caused by distributed anelastic Strain confined in a tetrahedral volume. These solutions form the basis of curvilinear meshes that can adapt to realistic structural settings, such as a mantle wedge corner, a spherical shell around a magma chamber, or an aquifer. I provide computer programs to evaluate them in the cases of antiPlane Strain, Plane Strain, and three-dimensional deformation. These tools may prove useful in the modeling of deformation data in tectonics, volcanology, and hydrology studies.
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Displacement and Stress Associated with Distributed Anelastic Deformation in a Half‐Space
Bulletin of the Seismological Society of America, 2017Co-Authors: Sylvain Barbot, James D P Moore, Valère LambertAbstract:We present a suite of analytical and semianalytical solutions for the displacements, Strains, and stress due to distributed anelastic deformation of finite Strain volumes in a half‐space for cuboid sources. We provide the solutions in the cases of antiPlane Strain, Plane Strain, and 3D deformation. These expressions represent powerful tools for the analysis of deformation data to image distributed Strain in the Earth’s interior and for the dynamic modeling of distributed deformation off faults, including thermoelasticity, poroelasticity, and viscoelasticity. We include computer programs that evaluate these expressions free of major singular points. Combined with formulas that describe the deformation around faults, these solutions represent a comprehensive description of quasi‐static deformation throughout the earthquake cycle within the lithosphere–asthenosphere system. [Electronic Supplement:][1]Animations of displacement and stress. [1]: http://www.bssaonline.org/lookup/suppl/doi:10.1785/0120160237/-/DC1
