The Experts below are selected from a list of 249 Experts worldwide ranked by ideXlab platform
Jonatha D Haftel - One of the best experts on this subject based on the ideXlab platform.
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slow crack growth behavior of zirconia toughened alumina and alumina using the Dynamic Fatigue indentation technique
Journal of the American Ceramic Society, 2011Co-Authors: Subramania Ramalingam, Edwi R Fulle, Ivar E. Reimanis, Jonatha D HaftelAbstract:A Dynamic Fatigue indentation technique was used to determine the slow crack growth (SCG) parameters of a medical-grade platelet-reinforced zirconia-toughened alumina and two different fine-grain aluminas: one a common grade of nominal 99.5% purity, and the other a high-purity (99.94%) medical-grade alumina. Fatigue tests in bending were performed at various loading rates with precracked Vickers indentations in 100% relative humidity conditions. Inert strength tests were performed in dry nitrogen. The Dynamic Fatigue analysis accounts for the presence of the indentation. The SCG power law exponent was found to be 36, 65, and 93 for the 99.5% alumina, the 99.94% alumina, and the zirconia-toughened alumina, respectively. The presence of glassy phase likely increases SCG in the 99.5% alumina compared with the higher purity alumina. The zirconia-toughened alumina exhibits a relatively steep R curve that forms due to two toughening mechanisms: platelet reinforcement and transformation toughening. It is apparent that neither of mechanisms degrades significantly due to moisture-assisted SCG.
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Slow Crack Growth Behavior of Zirconia‐Toughened Alumina and Alumina Using the Dynamic Fatigue Indentation Technique
Journal of the American Ceramic Society, 2010Co-Authors: Subramanian Ramalingam, Edwin R. Fuller, Ivar E. Reimanis, Jonatha D HaftelAbstract:A Dynamic Fatigue indentation technique was used to determine the slow crack growth (SCG) parameters of a medical-grade platelet-reinforced zirconia-toughened alumina and two different fine-grain aluminas: one a common grade of nominal 99.5% purity, and the other a high-purity (99.94%) medical-grade alumina. Fatigue tests in bending were performed at various loading rates with precracked Vickers indentations in 100% relative humidity conditions. Inert strength tests were performed in dry nitrogen. The Dynamic Fatigue analysis accounts for the presence of the indentation. The SCG power law exponent was found to be 36, 65, and 93 for the 99.5% alumina, the 99.94% alumina, and the zirconia-toughened alumina, respectively. The presence of glassy phase likely increases SCG in the 99.5% alumina compared with the higher purity alumina. The zirconia-toughened alumina exhibits a relatively steep R curve that forms due to two toughening mechanisms: platelet reinforcement and transformation toughening. It is apparent that neither of mechanisms degrades significantly due to moisture-assisted SCG.
Minoru Tomozawa - One of the best experts on this subject based on the ideXlab platform.
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Ion‐Exchanged Lithium Aluminosilicate Glass: Strength and Dynamic Fatigue
Journal of the American Ceramic Society, 2016Co-Authors: Emily M. Aaldenberg, Peter Joseph Lezzi, Jared H. Seaman, Thierry A. Blanchet, Minoru TomozawaAbstract:Sodium for lithium and potassium for lithium ion-exchanges of a lithium aluminosilicate glass were conducted and the resulting strength and Dynamic Fatigue characteristics were studied. Four-point bend mechanical tests revealed that greater strengthening can be achieved by the potassium for lithium ion-exchange, compared to the sodium for lithium ion-exchange, and that the Dynamic Fatigue tendency is strongly suppressed by both exchanges. This suppression of Dynamic Fatigue characteristics of ion-exchange strengthened glass was explained by the ability of the surface compressive layer to delay the onset of slow crack growth. Bulk stresses continue to increase in magnitude while the crack is arrested in the surface compressive stress region. Upon offsetting the surface compressive stress, the crack rapidly propagates into a high-magnitude tensile stress field until the fracture toughness is reached, resulting in minimal crack growth prior to material failure. A slow crack growth model utilizing a fracture mechanics weight function was developed to simulate the experiments. Dynamic Fatigue characteristics of the as-received glass, without ion-exchange treatment, were also measured and simulated for comparison.
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Effect of Fictive Temperature on Dynamic Fatigue Behavior of Silica and Soda‐Lime Glasses
Journal of the American Ceramic Society, 1995Co-Authors: Anand Agarwal, Minoru TomozawaAbstract:The Dynamic Fatigue characteristics of silica glasses with fictive temperatures of 1000°, 1100°, and 1300°C and soda-lime glasses with fictive temperatures of 470° and 530°C were measured in air. For both glasses, samples with higher fictive temperatures had a greater Fatigue resistance. Inert strength of silica glasses with flctive temperatures of 1000° and 1300°C was also measured at liquid nitrogen temperature. Glass with higher flctive temperature had a greater inert strength.
Anand Agarwal - One of the best experts on this subject based on the ideXlab platform.
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effect of fictive temperature on Dynamic Fatigue behavior of silica and soda lime glasses
Journal of the American Ceramic Society, 1995Co-Authors: Anand Agarwal, M TomozawaAbstract:The Dynamic Fatigue characteristics of silica glasses with fictive temperatures of 1000°, 1100°, and 1300°C and soda-lime glasses with fictive temperatures of 470° and 530°C were measured in air. For both glasses, samples with higher fictive temperatures had a greater Fatigue resistance. Inert strength of silica glasses with flctive temperatures of 1000° and 1300°C was also measured at liquid nitrogen temperature. Glass with higher flctive temperature had a greater inert strength.
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Effect of Fictive Temperature on Dynamic Fatigue Behavior of Silica and Soda‐Lime Glasses
Journal of the American Ceramic Society, 1995Co-Authors: Anand Agarwal, Minoru TomozawaAbstract:The Dynamic Fatigue characteristics of silica glasses with fictive temperatures of 1000°, 1100°, and 1300°C and soda-lime glasses with fictive temperatures of 470° and 530°C were measured in air. For both glasses, samples with higher fictive temperatures had a greater Fatigue resistance. Inert strength of silica glasses with flctive temperatures of 1000° and 1300°C was also measured at liquid nitrogen temperature. Glass with higher flctive temperature had a greater inert strength.
Ivar E. Reimanis - One of the best experts on this subject based on the ideXlab platform.
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slow crack growth behavior of zirconia toughened alumina and alumina using the Dynamic Fatigue indentation technique
Journal of the American Ceramic Society, 2011Co-Authors: Subramania Ramalingam, Edwi R Fulle, Ivar E. Reimanis, Jonatha D HaftelAbstract:A Dynamic Fatigue indentation technique was used to determine the slow crack growth (SCG) parameters of a medical-grade platelet-reinforced zirconia-toughened alumina and two different fine-grain aluminas: one a common grade of nominal 99.5% purity, and the other a high-purity (99.94%) medical-grade alumina. Fatigue tests in bending were performed at various loading rates with precracked Vickers indentations in 100% relative humidity conditions. Inert strength tests were performed in dry nitrogen. The Dynamic Fatigue analysis accounts for the presence of the indentation. The SCG power law exponent was found to be 36, 65, and 93 for the 99.5% alumina, the 99.94% alumina, and the zirconia-toughened alumina, respectively. The presence of glassy phase likely increases SCG in the 99.5% alumina compared with the higher purity alumina. The zirconia-toughened alumina exhibits a relatively steep R curve that forms due to two toughening mechanisms: platelet reinforcement and transformation toughening. It is apparent that neither of mechanisms degrades significantly due to moisture-assisted SCG.
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Slow Crack Growth Behavior of Zirconia‐Toughened Alumina and Alumina Using the Dynamic Fatigue Indentation Technique
Journal of the American Ceramic Society, 2010Co-Authors: Subramanian Ramalingam, Edwin R. Fuller, Ivar E. Reimanis, Jonatha D HaftelAbstract:A Dynamic Fatigue indentation technique was used to determine the slow crack growth (SCG) parameters of a medical-grade platelet-reinforced zirconia-toughened alumina and two different fine-grain aluminas: one a common grade of nominal 99.5% purity, and the other a high-purity (99.94%) medical-grade alumina. Fatigue tests in bending were performed at various loading rates with precracked Vickers indentations in 100% relative humidity conditions. Inert strength tests were performed in dry nitrogen. The Dynamic Fatigue analysis accounts for the presence of the indentation. The SCG power law exponent was found to be 36, 65, and 93 for the 99.5% alumina, the 99.94% alumina, and the zirconia-toughened alumina, respectively. The presence of glassy phase likely increases SCG in the 99.5% alumina compared with the higher purity alumina. The zirconia-toughened alumina exhibits a relatively steep R curve that forms due to two toughening mechanisms: platelet reinforcement and transformation toughening. It is apparent that neither of mechanisms degrades significantly due to moisture-assisted SCG.
M Tomozawa - One of the best experts on this subject based on the ideXlab platform.
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effect of fictive temperature on Dynamic Fatigue behavior of silica and soda lime glasses
Journal of the American Ceramic Society, 1995Co-Authors: Anand Agarwal, M TomozawaAbstract:The Dynamic Fatigue characteristics of silica glasses with fictive temperatures of 1000°, 1100°, and 1300°C and soda-lime glasses with fictive temperatures of 470° and 530°C were measured in air. For both glasses, samples with higher fictive temperatures had a greater Fatigue resistance. Inert strength of silica glasses with flctive temperatures of 1000° and 1300°C was also measured at liquid nitrogen temperature. Glass with higher flctive temperature had a greater inert strength.
