The Experts below are selected from a list of 4695 Experts worldwide ranked by ideXlab platform
Guedes C Soares - One of the best experts on this subject based on the ideXlab platform.
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experimental and numerical strength assessment of stiffened plates subjected to severe non Uniform Corrosion degradation and compressive load
Ships and Offshore Structures, 2017Co-Authors: Y Garbatov, M Tekgoz, Guedes C SoaresAbstract:ABSTRACTThe objective of this work is to investigate experimentally and numerically the severe non-Uniform Corrosion degradation effect on the load carrying capacity of stiffened plates. Eight stiffened plates, which are initially corroded in real open sea conditions with different Corrosion degradation levels, have been tested under compressive load. Different factors leading to a reduction of structural capacity have been investigated, including the material properties, degree of degradation, equivalent thickness and testing support conditions. The experimental results also showed to be very close to those estimated by the existing guideline procedure for a numerical evaluation of the ultimate strength, adjusted to be used for the severe corroded stiffened plates.
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fast approach for ultimate strength assessment of steel box girders subjected to non Uniform Corrosion degradation
Corrosion Engineering Science and Technology, 2016Co-Authors: S Saadeldeen, Y Garbatov, Guedes C SoaresAbstract:The present paper assesses the ultimate bending moment of steel box girders subjected to intensive non-Uniform Corrosion degradation. A comparison between the experimental results of three corroded box girders and different existing formulations has been performed. The moment–curvature relationship for the three corroded box girders has been calculated using the Common Structural Rules iterative process and the finite element method, leading to a development of Corrosion scale factors to account for both geometrical and mechanical properties changes. Based on the experimental results, a relationship has been developed to calculate the equivalent Young's modulus of corroded structures as a function of the total reduction in cross-sectional area. A systematic procedure for the application of the newly developed fast approach and the new equivalent Young's modulus has been presented that can be used for any ultimate bending moment–curvature calculation tools.
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fatigue reliability of a web frame subjected to random non Uniform Corrosion wastage
Structural Safety, 2014Co-Authors: Wei Huang, Y Garbatov, Guedes C SoaresAbstract:An approach for reliability assessment of a welded structure subjected to Corrosion degradation and fatigue is developed. The objective of this work is to evaluate the fatigue reliability of a complicated ship welded structure subjected to random non-Uniform Corrosion and fatigue loading simultaneously. A three-dimensional finite element model accounting for randomly distributed non-Uniform Corrosion wastage based on non-linear time-dependent model is generated. Randomly corroded surface geometries are simulated by the use of the Monte Carlo simulation technique for different service times of Corrosion wastage and linear elastic finite element analysis are performed. Hotspot stresses around welded details on a web frame joint are determined. Based on nonlinear regression analysis, the time-dependent functions for the hot-spot stresses affected by Corrosion deterioration are fitted. The relationship between the structural fatigue damage and Corrosion deterioration caused by Corrosion thickness wastage at different times is quantified employing S–N approach. The statistical properties of fatigue damage and service life of critical hot-spots in the web frame welded joint are estimated taking into account random non-Uniform time-dependent Corrosion wastage. The fatigue reliability of the web frame welded joint during its service life is modelled as a series system of correlated components using the Ditlevsen bounds method.
R G Buchheit - One of the best experts on this subject based on the ideXlab platform.
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dependence on temperature ph and cl in the Uniform Corrosion of aluminum alloys 2024 t3 6061 t6 and 7075 t6
Electrochimica Acta, 2016Co-Authors: Iwen Huang, Belinda Hurley, Fan Yang, R G BuchheitAbstract:Abstract With regards to localized Corrosion, the role of Uniform Corrosion of aluminum alloys has not always been accounted for in the past. The impact of Uniform Corrosion on aluminum alloys 2024-T3, 6061-T6, and 7075-T6 is studied here to provide quantitative evidence of its importance. Preliminary weight loss experiments combined with optical profilometry (OP) indicate that Corrosion attributed to Uniform Corrosion is very significant when compared to localized Corrosion. A series of free immersion tests were conducted to understand the influence of environmental variables including temperature (20, 40, 60, 80 °C), initial pH without buffering (3, 5, 8, 10) and chloride concentration (0.01, 0.1, 1 M) for 1, 7, and 30 days. With time, Uniform Corrosion results exhibited a strong dependence on temperature accompanied by variable pH- and temperature-dependent Corrosion product formation. Electrochemical approaches including electrochemical impedance spectroscopy (EIS) and cathodic polarization were utilized to characterize the oxygen reduction reaction (ORR) and Corrosion product formation as a function of temperature. Electron microscopy was conducted to assess the microstructure and morphology of Corrosion products and provide supporting evidence for electrochemical findings.
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Dependence on Temperature, pH, and Cl− in the Uniform Corrosion of Aluminum Alloys 2024-T3, 6061-T6, and 7075-T6
Electrochimica Acta, 2016Co-Authors: Iwen Huang, Belinda Hurley, Fan Yang, R G BuchheitAbstract:Abstract With regards to localized Corrosion, the role of Uniform Corrosion of aluminum alloys has not always been accounted for in the past. The impact of Uniform Corrosion on aluminum alloys 2024-T3, 6061-T6, and 7075-T6 is studied here to provide quantitative evidence of its importance. Preliminary weight loss experiments combined with optical profilometry (OP) indicate that Corrosion attributed to Uniform Corrosion is very significant when compared to localized Corrosion. A series of free immersion tests were conducted to understand the influence of environmental variables including temperature (20, 40, 60, 80 °C), initial pH without buffering (3, 5, 8, 10) and chloride concentration (0.01, 0.1, 1 M) for 1, 7, and 30 days. With time, Uniform Corrosion results exhibited a strong dependence on temperature accompanied by variable pH- and temperature-dependent Corrosion product formation. Electrochemical approaches including electrochemical impedance spectroscopy (EIS) and cathodic polarization were utilized to characterize the oxygen reduction reaction (ORR) and Corrosion product formation as a function of temperature. Electron microscopy was conducted to assess the microstructure and morphology of Corrosion products and provide supporting evidence for electrochemical findings.
Yun Li - One of the best experts on this subject based on the ideXlab platform.
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Observation of the pitting Corrosion and Uniform Corrosion for X80 steel in 3.5 wt.% NaCl solutions using in-situ and 3-D measuring microscope
Corrosion Science, 2016Co-Authors: Yafei Wang, Guangxu Cheng, Yun LiAbstract:The Corrosion morphology of X80 steel in neutral NaCl solutions was investigated using an in situ 3-D measuring microscope. The time-evolutions of the initiation and propagation process of Corrosion pits are presented and the three-dimensional structure of the Corrosion pits could be observed. Both regular Corrosion pits and Corrosion products of this Uniform Corrosion could be analyzed. Furthermore, the effect of temperature on the Corrosion morphology was studied. The mechanisms related to the initiation and propagation processes of pitting Corrosion as well as the effect of temperature for X80 in NaCl solutions have been proposed.
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observation of the pitting Corrosion and Uniform Corrosion for x80 steel in 3 5 wt nacl solutions using in situ and 3 d measuring microscope
Corrosion Science, 2016Co-Authors: Yafei Wang, Guangxu Cheng, Yun LiAbstract:The Corrosion morphology of X80 steel in neutral NaCl solutions was investigated using an in situ 3-D measuring microscope. The time-evolutions of the initiation and propagation process of Corrosion pits are presented and the three-dimensional structure of the Corrosion pits could be observed. Both regular Corrosion pits and Corrosion products of this Uniform Corrosion could be analyzed. Furthermore, the effect of temperature on the Corrosion morphology was studied. The mechanisms related to the initiation and propagation processes of pitting Corrosion as well as the effect of temperature for X80 in NaCl solutions have been proposed.
Iwen Huang - One of the best experts on this subject based on the ideXlab platform.
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dependence on temperature ph and cl in the Uniform Corrosion of aluminum alloys 2024 t3 6061 t6 and 7075 t6
Electrochimica Acta, 2016Co-Authors: Iwen Huang, Belinda Hurley, Fan Yang, R G BuchheitAbstract:Abstract With regards to localized Corrosion, the role of Uniform Corrosion of aluminum alloys has not always been accounted for in the past. The impact of Uniform Corrosion on aluminum alloys 2024-T3, 6061-T6, and 7075-T6 is studied here to provide quantitative evidence of its importance. Preliminary weight loss experiments combined with optical profilometry (OP) indicate that Corrosion attributed to Uniform Corrosion is very significant when compared to localized Corrosion. A series of free immersion tests were conducted to understand the influence of environmental variables including temperature (20, 40, 60, 80 °C), initial pH without buffering (3, 5, 8, 10) and chloride concentration (0.01, 0.1, 1 M) for 1, 7, and 30 days. With time, Uniform Corrosion results exhibited a strong dependence on temperature accompanied by variable pH- and temperature-dependent Corrosion product formation. Electrochemical approaches including electrochemical impedance spectroscopy (EIS) and cathodic polarization were utilized to characterize the oxygen reduction reaction (ORR) and Corrosion product formation as a function of temperature. Electron microscopy was conducted to assess the microstructure and morphology of Corrosion products and provide supporting evidence for electrochemical findings.
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Dependence on Temperature, pH, and Cl− in the Uniform Corrosion of Aluminum Alloys 2024-T3, 6061-T6, and 7075-T6
Electrochimica Acta, 2016Co-Authors: Iwen Huang, Belinda Hurley, Fan Yang, R G BuchheitAbstract:Abstract With regards to localized Corrosion, the role of Uniform Corrosion of aluminum alloys has not always been accounted for in the past. The impact of Uniform Corrosion on aluminum alloys 2024-T3, 6061-T6, and 7075-T6 is studied here to provide quantitative evidence of its importance. Preliminary weight loss experiments combined with optical profilometry (OP) indicate that Corrosion attributed to Uniform Corrosion is very significant when compared to localized Corrosion. A series of free immersion tests were conducted to understand the influence of environmental variables including temperature (20, 40, 60, 80 °C), initial pH without buffering (3, 5, 8, 10) and chloride concentration (0.01, 0.1, 1 M) for 1, 7, and 30 days. With time, Uniform Corrosion results exhibited a strong dependence on temperature accompanied by variable pH- and temperature-dependent Corrosion product formation. Electrochemical approaches including electrochemical impedance spectroscopy (EIS) and cathodic polarization were utilized to characterize the oxygen reduction reaction (ORR) and Corrosion product formation as a function of temperature. Electron microscopy was conducted to assess the microstructure and morphology of Corrosion products and provide supporting evidence for electrochemical findings.
Y Garbatov - One of the best experts on this subject based on the ideXlab platform.
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experimental and numerical strength assessment of stiffened plates subjected to severe non Uniform Corrosion degradation and compressive load
Ships and Offshore Structures, 2017Co-Authors: Y Garbatov, M Tekgoz, Guedes C SoaresAbstract:ABSTRACTThe objective of this work is to investigate experimentally and numerically the severe non-Uniform Corrosion degradation effect on the load carrying capacity of stiffened plates. Eight stiffened plates, which are initially corroded in real open sea conditions with different Corrosion degradation levels, have been tested under compressive load. Different factors leading to a reduction of structural capacity have been investigated, including the material properties, degree of degradation, equivalent thickness and testing support conditions. The experimental results also showed to be very close to those estimated by the existing guideline procedure for a numerical evaluation of the ultimate strength, adjusted to be used for the severe corroded stiffened plates.
-
fast approach for ultimate strength assessment of steel box girders subjected to non Uniform Corrosion degradation
Corrosion Engineering Science and Technology, 2016Co-Authors: S Saadeldeen, Y Garbatov, Guedes C SoaresAbstract:The present paper assesses the ultimate bending moment of steel box girders subjected to intensive non-Uniform Corrosion degradation. A comparison between the experimental results of three corroded box girders and different existing formulations has been performed. The moment–curvature relationship for the three corroded box girders has been calculated using the Common Structural Rules iterative process and the finite element method, leading to a development of Corrosion scale factors to account for both geometrical and mechanical properties changes. Based on the experimental results, a relationship has been developed to calculate the equivalent Young's modulus of corroded structures as a function of the total reduction in cross-sectional area. A systematic procedure for the application of the newly developed fast approach and the new equivalent Young's modulus has been presented that can be used for any ultimate bending moment–curvature calculation tools.
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fatigue reliability of a web frame subjected to random non Uniform Corrosion wastage
Structural Safety, 2014Co-Authors: Wei Huang, Y Garbatov, Guedes C SoaresAbstract:An approach for reliability assessment of a welded structure subjected to Corrosion degradation and fatigue is developed. The objective of this work is to evaluate the fatigue reliability of a complicated ship welded structure subjected to random non-Uniform Corrosion and fatigue loading simultaneously. A three-dimensional finite element model accounting for randomly distributed non-Uniform Corrosion wastage based on non-linear time-dependent model is generated. Randomly corroded surface geometries are simulated by the use of the Monte Carlo simulation technique for different service times of Corrosion wastage and linear elastic finite element analysis are performed. Hotspot stresses around welded details on a web frame joint are determined. Based on nonlinear regression analysis, the time-dependent functions for the hot-spot stresses affected by Corrosion deterioration are fitted. The relationship between the structural fatigue damage and Corrosion deterioration caused by Corrosion thickness wastage at different times is quantified employing S–N approach. The statistical properties of fatigue damage and service life of critical hot-spots in the web frame welded joint are estimated taking into account random non-Uniform time-dependent Corrosion wastage. The fatigue reliability of the web frame welded joint during its service life is modelled as a series system of correlated components using the Ditlevsen bounds method.
