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Martin O Saar - One of the best experts on this subject based on the ideXlab platform.

  • Magma Yield Stress and permeability: Insights from multiphase percolation theory
    2020
    Co-Authors: Stuart D C Walsh, Martin O Saar
    Abstract:

    a b s t r a c t a r t i c l e i n f o Magmas often contain multiple interacting phases of embedded solid and gas inclusions. Multiphase percolation theory provides a means of modeling assemblies of these different classes of magmatic inclusions in a simple, yet powerful way. Like its single phase counterpart, multiphase percolation theory describes the connectivity of discrete inclusion assemblies as a function of phase topology. In addition, multiphase percolation employs basic laws to distinguish separate classes of objects and is characterized by its dependency on the order in which the different phases appear. This paper examines two applications of multiphase percolation theory: the first considers how the presence of bubble inclusions influences Yield Stress onset and growth in a magma's crystal network; the second examines the effect of bi-modal bubble-size distributions on magma permeability. We find that the presence of bubbles induces crystal clustering, thereby 1) reducing the percolation threshold, or critical crystal volume fraction, ϕ c , at which the crystals form a space-spanning network providing a Minimum Yield Stress, and 2) resulting in a larger Yield Stress for a given crystal volume fraction above ϕ c . This increase in the Yield Stress of the crystal network may also occur when crystal clusters are formed due to processes other than bubble formation, such as heterogeneous crystallization, synneusis, and heterogeneity due to deformation or flow. Further, we find that bimodal bubble size distributions can significantly affect the permeability of the system beyond the percolation threshold. This study thus demonstrates that larger-scale structures and topologies, as well as the order in which different phases appear, can have significant effects on macroscopic properties in multiphase materials

  • magma Yield Stress and permeability insights from multiphase percolation theory
    Journal of Volcanology and Geothermal Research, 2008
    Co-Authors: Stuart D C Walsh, Martin O Saar
    Abstract:

    Abstract Magmas often contain multiple interacting phases of embedded solid and gas inclusions. Multiphase percolation theory provides a means of modeling assemblies of these different classes of magmatic inclusions in a simple, yet powerful way. Like its single phase counterpart, multiphase percolation theory describes the connectivity of discrete inclusion assemblies as a function of phase topology. In addition, multiphase percolation employs basic laws to distinguish separate classes of objects and is characterized by its dependency on the order in which the different phases appear. This paper examines two applications of multiphase percolation theory: the first considers how the presence of bubble inclusions influences Yield Stress onset and growth in a magma's crystal network; the second examines the effect of bi-modal bubble-size distributions on magma permeability. We find that the presence of bubbles induces crystal clustering, thereby 1) reducing the percolation threshold, or critical crystal volume fraction, ϕ c , at which the crystals form a space-spanning network providing a Minimum Yield Stress, and 2) resulting in a larger Yield Stress for a given crystal volume fraction above ϕ c . This increase in the Yield Stress of the crystal network may also occur when crystal clusters are formed due to processes other than bubble formation, such as heterogeneous crystallization, synneusis, and heterogeneity due to deformation or flow. Further, we find that bimodal bubble size distributions can significantly affect the permeability of the system beyond the percolation threshold. This study thus demonstrates that larger-scale structures and topologies, as well as the order in which different phases appear, can have significant effects on macroscopic properties in multiphase materials.

Stuart D C Walsh - One of the best experts on this subject based on the ideXlab platform.

  • Magma Yield Stress and permeability: Insights from multiphase percolation theory
    2020
    Co-Authors: Stuart D C Walsh, Martin O Saar
    Abstract:

    a b s t r a c t a r t i c l e i n f o Magmas often contain multiple interacting phases of embedded solid and gas inclusions. Multiphase percolation theory provides a means of modeling assemblies of these different classes of magmatic inclusions in a simple, yet powerful way. Like its single phase counterpart, multiphase percolation theory describes the connectivity of discrete inclusion assemblies as a function of phase topology. In addition, multiphase percolation employs basic laws to distinguish separate classes of objects and is characterized by its dependency on the order in which the different phases appear. This paper examines two applications of multiphase percolation theory: the first considers how the presence of bubble inclusions influences Yield Stress onset and growth in a magma's crystal network; the second examines the effect of bi-modal bubble-size distributions on magma permeability. We find that the presence of bubbles induces crystal clustering, thereby 1) reducing the percolation threshold, or critical crystal volume fraction, ϕ c , at which the crystals form a space-spanning network providing a Minimum Yield Stress, and 2) resulting in a larger Yield Stress for a given crystal volume fraction above ϕ c . This increase in the Yield Stress of the crystal network may also occur when crystal clusters are formed due to processes other than bubble formation, such as heterogeneous crystallization, synneusis, and heterogeneity due to deformation or flow. Further, we find that bimodal bubble size distributions can significantly affect the permeability of the system beyond the percolation threshold. This study thus demonstrates that larger-scale structures and topologies, as well as the order in which different phases appear, can have significant effects on macroscopic properties in multiphase materials

  • magma Yield Stress and permeability insights from multiphase percolation theory
    Journal of Volcanology and Geothermal Research, 2008
    Co-Authors: Stuart D C Walsh, Martin O Saar
    Abstract:

    Abstract Magmas often contain multiple interacting phases of embedded solid and gas inclusions. Multiphase percolation theory provides a means of modeling assemblies of these different classes of magmatic inclusions in a simple, yet powerful way. Like its single phase counterpart, multiphase percolation theory describes the connectivity of discrete inclusion assemblies as a function of phase topology. In addition, multiphase percolation employs basic laws to distinguish separate classes of objects and is characterized by its dependency on the order in which the different phases appear. This paper examines two applications of multiphase percolation theory: the first considers how the presence of bubble inclusions influences Yield Stress onset and growth in a magma's crystal network; the second examines the effect of bi-modal bubble-size distributions on magma permeability. We find that the presence of bubbles induces crystal clustering, thereby 1) reducing the percolation threshold, or critical crystal volume fraction, ϕ c , at which the crystals form a space-spanning network providing a Minimum Yield Stress, and 2) resulting in a larger Yield Stress for a given crystal volume fraction above ϕ c . This increase in the Yield Stress of the crystal network may also occur when crystal clusters are formed due to processes other than bubble formation, such as heterogeneous crystallization, synneusis, and heterogeneity due to deformation or flow. Further, we find that bimodal bubble size distributions can significantly affect the permeability of the system beyond the percolation threshold. This study thus demonstrates that larger-scale structures and topologies, as well as the order in which different phases appear, can have significant effects on macroscopic properties in multiphase materials.

Hiroyuki Takada - One of the best experts on this subject based on the ideXlab platform.

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    Journal of Pressure Vessel Technology-transactions of The Asme, 2009
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    This paper is based on work done to establish the validity of a simple engineering approach to assess plastic collapse for a vessel with a local thin area (LTA). The approach is based on a recently developed p-M (internal pressure ratio and external bending moment ratio) diagram, which is an easy way to visualize the status of a vessel with a LTA simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. If the assessment point (M r , p r ) lies inside the p-M line, the vessel with the LTA is judged to be safe. Numerous experiments and finite element analyses for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are similar to those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki fitness for service (FFS) rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0-3.0, about 1.5-4.0 for the TES loads at LTA, and 2.5-6.5 for the plastic instability (break) loads.

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    Journal of Pressure Vessel Technology-transactions of The Asme, 2009
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    This paper is based on work done to establish the validity of a simple engineering approach to assess plastic collapse for a vessel with a local thin area (LTA). The approach is based on a recently developed p-M (internal pressure ratio and external bending moment ratio) diagram, which is an easy way to visualize the status of a vessel with a LTA simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. If the assessment point (M r , p r ) lies inside the p-M line, the vessel with the LTA is judged to be safe. Numerous experiments and finite element analyses for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are similar to those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki fitness for service (FFS) rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0-3.0, about 1.5-4.0 for the TES loads at LTA, and 2.5-6.5 for the plastic instability (break) loads.

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    ASME 2007 Pressure Vessels and Piping Conference, 2007
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    The newly-developed p-M diagram provides a means for readily evaluating the collapse load of pressure equipment with external flaws simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. In this paper, numerous experiments and FEAs for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are much the same as those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki FFS rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0–3.0, about 1.5–4.0 for the TES loads at LTA and 2.5–6.5 for the plastic instability (break) loads.Copyright © 2007 by ASME

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    ASME 2007 Pressure Vessels and Piping Conference, 2007
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    The newly-developed p-M diagram provides a means for readily evaluating the collapse load of pressure equipment with external flaws simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. In this paper, numerous experiments and FEAs for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are much the same as those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki FFS rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0–3.0, about 1.5–4.0 for the TES loads at LTA and 2.5–6.5 for the plastic instability (break) loads.Copyright © 2007 by ASME

Shinji Konosu - One of the best experts on this subject based on the ideXlab platform.

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    Journal of Pressure Vessel Technology-transactions of The Asme, 2009
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    This paper is based on work done to establish the validity of a simple engineering approach to assess plastic collapse for a vessel with a local thin area (LTA). The approach is based on a recently developed p-M (internal pressure ratio and external bending moment ratio) diagram, which is an easy way to visualize the status of a vessel with a LTA simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. If the assessment point (M r , p r ) lies inside the p-M line, the vessel with the LTA is judged to be safe. Numerous experiments and finite element analyses for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are similar to those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki fitness for service (FFS) rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0-3.0, about 1.5-4.0 for the TES loads at LTA, and 2.5-6.5 for the plastic instability (break) loads.

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    Journal of Pressure Vessel Technology-transactions of The Asme, 2009
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    This paper is based on work done to establish the validity of a simple engineering approach to assess plastic collapse for a vessel with a local thin area (LTA). The approach is based on a recently developed p-M (internal pressure ratio and external bending moment ratio) diagram, which is an easy way to visualize the status of a vessel with a LTA simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. If the assessment point (M r , p r ) lies inside the p-M line, the vessel with the LTA is judged to be safe. Numerous experiments and finite element analyses for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are similar to those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki fitness for service (FFS) rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0-3.0, about 1.5-4.0 for the TES loads at LTA, and 2.5-6.5 for the plastic instability (break) loads.

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    ASME 2007 Pressure Vessels and Piping Conference, 2007
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    The newly-developed p-M diagram provides a means for readily evaluating the collapse load of pressure equipment with external flaws simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. In this paper, numerous experiments and FEAs for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are much the same as those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki FFS rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0–3.0, about 1.5–4.0 for the TES loads at LTA and 2.5–6.5 for the plastic instability (break) loads.Copyright © 2007 by ASME

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    ASME 2007 Pressure Vessels and Piping Conference, 2007
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    The newly-developed p-M diagram provides a means for readily evaluating the collapse load of pressure equipment with external flaws simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. In this paper, numerous experiments and FEAs for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are much the same as those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki FFS rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0–3.0, about 1.5–4.0 for the TES loads at LTA and 2.5–6.5 for the plastic instability (break) loads.Copyright © 2007 by ASME

Masato Kano - One of the best experts on this subject based on the ideXlab platform.

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    Journal of Pressure Vessel Technology-transactions of The Asme, 2009
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    This paper is based on work done to establish the validity of a simple engineering approach to assess plastic collapse for a vessel with a local thin area (LTA). The approach is based on a recently developed p-M (internal pressure ratio and external bending moment ratio) diagram, which is an easy way to visualize the status of a vessel with a LTA simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. If the assessment point (M r , p r ) lies inside the p-M line, the vessel with the LTA is judged to be safe. Numerous experiments and finite element analyses for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are similar to those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki fitness for service (FFS) rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0-3.0, about 1.5-4.0 for the TES loads at LTA, and 2.5-6.5 for the plastic instability (break) loads.

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    Journal of Pressure Vessel Technology-transactions of The Asme, 2009
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    This paper is based on work done to establish the validity of a simple engineering approach to assess plastic collapse for a vessel with a local thin area (LTA). The approach is based on a recently developed p-M (internal pressure ratio and external bending moment ratio) diagram, which is an easy way to visualize the status of a vessel with a LTA simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. If the assessment point (M r , p r ) lies inside the p-M line, the vessel with the LTA is judged to be safe. Numerous experiments and finite element analyses for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are similar to those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki fitness for service (FFS) rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0-3.0, about 1.5-4.0 for the TES loads at LTA, and 2.5-6.5 for the plastic instability (break) loads.

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    ASME 2007 Pressure Vessels and Piping Conference, 2007
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    The newly-developed p-M diagram provides a means for readily evaluating the collapse load of pressure equipment with external flaws simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. In this paper, numerous experiments and FEAs for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are much the same as those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki FFS rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0–3.0, about 1.5–4.0 for the TES loads at LTA and 2.5–6.5 for the plastic instability (break) loads.Copyright © 2007 by ASME

  • plastic collapse load for vessel with external flaw simultaneously subjected to internal pressure and external bending moment experimental and fea results
    ASME 2007 Pressure Vessels and Piping Conference, 2007
    Co-Authors: Shinji Konosu, Masato Kano, Norihiko Mukaimachi, Hiroyuki Komura, Hiroyuki Takada
    Abstract:

    The newly-developed p-M diagram provides a means for readily evaluating the collapse load of pressure equipment with external flaws simultaneously subjected to internal pressure, p and external bending moment, M due to earthquake, etc. In this paper, numerous experiments and FEAs for a cylinder with an external flaw were conducted under (1) pure internal pressure, (2) pure external bending moment, and (3) subjected simultaneously to both internal pressure and external bending moment, in order to determine the plastic initiation load and plastic collapse load by applying the twice-elastic slope (TES) as recommended by ASME. It has been clarified that the collapse (TES) loads are much the same as those calculated under the proposed p-M line based on the measured Yield Stress. The p-M line adopted in the Ibaraki FFS rule based on the specified Minimum Yield Stress with a safety factor of 1.5 indicates that the safety margin for the plastic initiation loads at LTA is about 1.0–3.0, about 1.5–4.0 for the TES loads at LTA and 2.5–6.5 for the plastic instability (break) loads.Copyright © 2007 by ASME