The Experts below are selected from a list of 15045 Experts worldwide ranked by ideXlab platform
Etienne Patoor - One of the best experts on this subject based on the ideXlab platform.
-
thermomechanical transformation fatigue of tinicu sma actuators under a Corrosive Environment part i experimental results
International Journal of Fatigue, 2009Co-Authors: Olivier W. Bertacchini, Dimitris C. Lagoudas, Etienne PatoorAbstract:Abstract In this two-part paper, the thermomechanical fatigue of TiNiCu shape memory alloy (SMA) wire actuators undergoing thermally induced martensitic phase transformation in a Corrosive Environment is investigated. The main objective of this work is to evaluate the cyclic response and fatigue behavior of TiNiCu SMA wire under Corrosive conditions and to compare it to results obtained for fatigue testing in a corrosion-free Environment. Part I focuses on the various experimental aspects of this work, including the presentation of fatigue results as a function of various testing parameters. The variable test parameters are five applied stress levels from about 50 MPa to about 250 MPa, and two different actuation strains, one corresponding to full actuation or complete transformation and the other to partial transformation. The results from fatigue testing in a Corrosive Environment show a consistent reduction of the fatigue life compared to corrosion-free fatigue results, in both complete and partial transformation conditions. It is also observed that corrosion-assisted fatigue leads to more scattered fatigue data and this spread is mostly attributed to enhanced and accelerated damage mechanisms due to corrosion. From these conclusions, a microstructure evaluation is performed to understand the damage that contributes to lower fatigue limits under corrosion and is presented in Part II of this work. Fracture surfaces, development of fatigue cracks and effect of corrosion are presented and discussed. The conclusion from the microstructure analysis has led to the formulation of a damage accumulation model accounting for a cyclic corrosion mechanism. This modeling approach allows for determining the fatigue life reduction of SMA wire actuators in a Corrosive Environment. All results of the microstructure analysis and fatigue life modeling are presented in Part II.
-
Thermomechanical transformation fatigue of TiNiCu SMA actuators under a Corrosive Environment – Part I: Experimental results
International Journal of Fatigue, 2009Co-Authors: Olivier W. Bertacchini, Dimitris C. Lagoudas, Etienne PatoorAbstract:Abstract In this two-part paper, the thermomechanical fatigue of TiNiCu shape memory alloy (SMA) wire actuators undergoing thermally induced martensitic phase transformation in a Corrosive Environment is investigated. The main objective of this work is to evaluate the cyclic response and fatigue behavior of TiNiCu SMA wire under Corrosive conditions and to compare it to results obtained for fatigue testing in a corrosion-free Environment. Part I focuses on the various experimental aspects of this work, including the presentation of fatigue results as a function of various testing parameters. The variable test parameters are five applied stress levels from about 50 MPa to about 250 MPa, and two different actuation strains, one corresponding to full actuation or complete transformation and the other to partial transformation. The results from fatigue testing in a Corrosive Environment show a consistent reduction of the fatigue life compared to corrosion-free fatigue results, in both complete and partial transformation conditions. It is also observed that corrosion-assisted fatigue leads to more scattered fatigue data and this spread is mostly attributed to enhanced and accelerated damage mechanisms due to corrosion. From these conclusions, a microstructure evaluation is performed to understand the damage that contributes to lower fatigue limits under corrosion and is presented in Part II of this work. Fracture surfaces, development of fatigue cracks and effect of corrosion are presented and discussed. The conclusion from the microstructure analysis has led to the formulation of a damage accumulation model accounting for a cyclic corrosion mechanism. This modeling approach allows for determining the fatigue life reduction of SMA wire actuators in a Corrosive Environment. All results of the microstructure analysis and fatigue life modeling are presented in Part II.
Olivier W. Bertacchini - One of the best experts on this subject based on the ideXlab platform.
-
thermomechanical transformation fatigue of tinicu sma actuators under a Corrosive Environment part i experimental results
International Journal of Fatigue, 2009Co-Authors: Olivier W. Bertacchini, Dimitris C. Lagoudas, Etienne PatoorAbstract:Abstract In this two-part paper, the thermomechanical fatigue of TiNiCu shape memory alloy (SMA) wire actuators undergoing thermally induced martensitic phase transformation in a Corrosive Environment is investigated. The main objective of this work is to evaluate the cyclic response and fatigue behavior of TiNiCu SMA wire under Corrosive conditions and to compare it to results obtained for fatigue testing in a corrosion-free Environment. Part I focuses on the various experimental aspects of this work, including the presentation of fatigue results as a function of various testing parameters. The variable test parameters are five applied stress levels from about 50 MPa to about 250 MPa, and two different actuation strains, one corresponding to full actuation or complete transformation and the other to partial transformation. The results from fatigue testing in a Corrosive Environment show a consistent reduction of the fatigue life compared to corrosion-free fatigue results, in both complete and partial transformation conditions. It is also observed that corrosion-assisted fatigue leads to more scattered fatigue data and this spread is mostly attributed to enhanced and accelerated damage mechanisms due to corrosion. From these conclusions, a microstructure evaluation is performed to understand the damage that contributes to lower fatigue limits under corrosion and is presented in Part II of this work. Fracture surfaces, development of fatigue cracks and effect of corrosion are presented and discussed. The conclusion from the microstructure analysis has led to the formulation of a damage accumulation model accounting for a cyclic corrosion mechanism. This modeling approach allows for determining the fatigue life reduction of SMA wire actuators in a Corrosive Environment. All results of the microstructure analysis and fatigue life modeling are presented in Part II.
-
Thermomechanical transformation fatigue of TiNiCu SMA actuators under a Corrosive Environment – Part I: Experimental results
International Journal of Fatigue, 2009Co-Authors: Olivier W. Bertacchini, Dimitris C. Lagoudas, Etienne PatoorAbstract:Abstract In this two-part paper, the thermomechanical fatigue of TiNiCu shape memory alloy (SMA) wire actuators undergoing thermally induced martensitic phase transformation in a Corrosive Environment is investigated. The main objective of this work is to evaluate the cyclic response and fatigue behavior of TiNiCu SMA wire under Corrosive conditions and to compare it to results obtained for fatigue testing in a corrosion-free Environment. Part I focuses on the various experimental aspects of this work, including the presentation of fatigue results as a function of various testing parameters. The variable test parameters are five applied stress levels from about 50 MPa to about 250 MPa, and two different actuation strains, one corresponding to full actuation or complete transformation and the other to partial transformation. The results from fatigue testing in a Corrosive Environment show a consistent reduction of the fatigue life compared to corrosion-free fatigue results, in both complete and partial transformation conditions. It is also observed that corrosion-assisted fatigue leads to more scattered fatigue data and this spread is mostly attributed to enhanced and accelerated damage mechanisms due to corrosion. From these conclusions, a microstructure evaluation is performed to understand the damage that contributes to lower fatigue limits under corrosion and is presented in Part II of this work. Fracture surfaces, development of fatigue cracks and effect of corrosion are presented and discussed. The conclusion from the microstructure analysis has led to the formulation of a damage accumulation model accounting for a cyclic corrosion mechanism. This modeling approach allows for determining the fatigue life reduction of SMA wire actuators in a Corrosive Environment. All results of the microstructure analysis and fatigue life modeling are presented in Part II.
Dimitris C. Lagoudas - One of the best experts on this subject based on the ideXlab platform.
-
thermomechanical transformation fatigue of tinicu sma actuators under a Corrosive Environment part i experimental results
International Journal of Fatigue, 2009Co-Authors: Olivier W. Bertacchini, Dimitris C. Lagoudas, Etienne PatoorAbstract:Abstract In this two-part paper, the thermomechanical fatigue of TiNiCu shape memory alloy (SMA) wire actuators undergoing thermally induced martensitic phase transformation in a Corrosive Environment is investigated. The main objective of this work is to evaluate the cyclic response and fatigue behavior of TiNiCu SMA wire under Corrosive conditions and to compare it to results obtained for fatigue testing in a corrosion-free Environment. Part I focuses on the various experimental aspects of this work, including the presentation of fatigue results as a function of various testing parameters. The variable test parameters are five applied stress levels from about 50 MPa to about 250 MPa, and two different actuation strains, one corresponding to full actuation or complete transformation and the other to partial transformation. The results from fatigue testing in a Corrosive Environment show a consistent reduction of the fatigue life compared to corrosion-free fatigue results, in both complete and partial transformation conditions. It is also observed that corrosion-assisted fatigue leads to more scattered fatigue data and this spread is mostly attributed to enhanced and accelerated damage mechanisms due to corrosion. From these conclusions, a microstructure evaluation is performed to understand the damage that contributes to lower fatigue limits under corrosion and is presented in Part II of this work. Fracture surfaces, development of fatigue cracks and effect of corrosion are presented and discussed. The conclusion from the microstructure analysis has led to the formulation of a damage accumulation model accounting for a cyclic corrosion mechanism. This modeling approach allows for determining the fatigue life reduction of SMA wire actuators in a Corrosive Environment. All results of the microstructure analysis and fatigue life modeling are presented in Part II.
-
Thermomechanical transformation fatigue of TiNiCu SMA actuators under a Corrosive Environment – Part I: Experimental results
International Journal of Fatigue, 2009Co-Authors: Olivier W. Bertacchini, Dimitris C. Lagoudas, Etienne PatoorAbstract:Abstract In this two-part paper, the thermomechanical fatigue of TiNiCu shape memory alloy (SMA) wire actuators undergoing thermally induced martensitic phase transformation in a Corrosive Environment is investigated. The main objective of this work is to evaluate the cyclic response and fatigue behavior of TiNiCu SMA wire under Corrosive conditions and to compare it to results obtained for fatigue testing in a corrosion-free Environment. Part I focuses on the various experimental aspects of this work, including the presentation of fatigue results as a function of various testing parameters. The variable test parameters are five applied stress levels from about 50 MPa to about 250 MPa, and two different actuation strains, one corresponding to full actuation or complete transformation and the other to partial transformation. The results from fatigue testing in a Corrosive Environment show a consistent reduction of the fatigue life compared to corrosion-free fatigue results, in both complete and partial transformation conditions. It is also observed that corrosion-assisted fatigue leads to more scattered fatigue data and this spread is mostly attributed to enhanced and accelerated damage mechanisms due to corrosion. From these conclusions, a microstructure evaluation is performed to understand the damage that contributes to lower fatigue limits under corrosion and is presented in Part II of this work. Fracture surfaces, development of fatigue cracks and effect of corrosion are presented and discussed. The conclusion from the microstructure analysis has led to the formulation of a damage accumulation model accounting for a cyclic corrosion mechanism. This modeling approach allows for determining the fatigue life reduction of SMA wire actuators in a Corrosive Environment. All results of the microstructure analysis and fatigue life modeling are presented in Part II.
Gary L. Leatherman - One of the best experts on this subject based on the ideXlab platform.
-
Static‐Fatigue Life of Ce‐TZP and Si3N4 in a Corrosive Environment
Journal of the American Ceramic Society, 1992Co-Authors: Jeffrey J. Swab, Gary L. LeathermanAbstract:Stress rupture testing was performed in four-point flexure at 1000°C to determine the effects of Na2SO4-induced corrosion on the static-fatigue life of a Ce-TZP and a MgO-doped Si3N4. The results showed that the static-fatigue life of the Ce-TZP was unaffected by this Corrosive Environment. However, the static-fatigue life of a MgO-doped Si3N4 was reduced by the introduction of Na2SO4.
Ryuichi Hamano - One of the best experts on this subject based on the ideXlab platform.
-
Fatigue crack growth from stage I to stage II in a Corrosive Environment
International Journal of Fatigue, 1997Co-Authors: Ryuichi HamanoAbstract:Abstract How a Corrosive Environment such as a 3.5% NaCl aqueous solution would affect the transition of fatigue crack initiation mode from stage I (shear mode) cracking to stage II (normal mode) cracking was investigated, using notched specimens of HT80 and SNCM439 steels (corresponding to AISI 4340 steel). The experimental result that the transition of fatigue crack growth from stage I to stage II was accelerated in a hydrogen-related Environment was discussed in terms of hydrogen induced dislocation multiplication near a crack tip. The microstructures immune to Environmental damage were examined, using a precipitate-hardened steel.
