The Experts below are selected from a list of 22788 Experts worldwide ranked by ideXlab platform
Wei Zhang - One of the best experts on this subject based on the ideXlab platform.
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Study on Corrosion Damage Rule for Two Type of Aluminum Alloy
Applied Mechanics and Materials, 2014Co-Authors: Dan Feng Zhang, Xiao Ming Tan, Dan Gui Zhang, Fang Zhang, Wei ZhangAbstract:Corrosion exists everywhere. It’s very widespread that the aluminum alloy aircraft structure suffers the Corrosion Damage under the marine environment particularly. The equivalent accelerated Corrosion test of the new aluminum alloy 2B06 and 7B04 was carried out.Corrosion Damage was inspected and measured through microscope. The rule of the Corrosion Damage can be obtained by statistical analysis. And which can supply the reference basis for the Corrosion Damage repair and evaluating the calendar life.
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Acoustic Emission Evaluation of the Pitting Corrosion Damage on the Cut-Stubble Disc Sickle
Advanced Materials Research, 2013Co-Authors: Wei Zhang, Hong Li WangAbstract:Disc Sickle; Acoustic Emission evaluation; pitting Corrosion Damage Abstract. By the pitting Corrosion simulation test in the laboratory, the law that the Disc Sickle Corrosion degree and AE signal vary with Corrosion time has been studied, and relationship curve between Corrosion Damage and AE parameter has been obtained. This explains that AE technology can be used for detecting forepart pitting Corrosion, researching the law of pitting Corrosion development, and evaluating Corrosion Damage.
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Detection and Evaluation of Corrosion Damage under Coating by Infrared Thermal Wave Technology
Applied Mechanics and Materials, 2012Co-Authors: Zhi Yong Huang, Wei Zhang, Zheng Wei YangAbstract:Aims at the safety problems caused by Corrosion under coating for it can not easily be observed, specimen of Corrosion Damage under coating was made for the research of detection by applying infrared thermal wave technology. The surface temperature distribution infrared thermal images were captured, also the surface temperature history of Corrosion area, non-Corrosion area and their difference. Analysis of test results show that the infrared thermal wave technology is an effective tool in detecting Corrosion Damage under coating, there has a fine detection time used to estimate the coating thickness, and the position and sizes of defects can be found out directly by the hot spots in the infrared images. The Damages can be quantitatively recognized by images processing, but surface uniformity of the specimen has great impact on the Damage identification.
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The Design of Image Database about Corrosion Damage of Aluminum Alloy
Applied Mechanics and Materials, 2011Co-Authors: Dong Mei She, Wei Zhang, Xiao Yan TongAbstract:As the data of aluminum alloy Corrosion is increasing, the experimental data and results of Corrosion Damage are collected in this paper, thus the Corrosion Damage draft at different Corrosion time and temperature are obtained. The Oracle 10g is introduced as basic database to design the image database of aluminum alloy Corrosion Damage. The front makes use of the asp.net to realize the web information displaying, meanwhile the Corrosion Damage database of aluminum alloy is realized the image data storage and retrieval. This provides a great convenience for researchers to utilize Corrosion Damage data. At the same time, the database stores the image data effectively, which improves the computer memory usage.
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Corrosion Damage Research of Shot Peening Aluminum Alloy
Applied Mechanics and Materials, 2011Co-Authors: Song Lin, Wei Zhang, Xiao Yan TongAbstract:The pre-Corrosion Damage tests of LC4 aluminum alloy with the shot peening surface treatment and un-shot peening surface treatment are performed under two different time levels: 12h and 24h. Based on the observation of the Corrosion morphology of aluminum alloy, the Corrosion Damage mechanism of shot peening aluminum alloy can be divided into three stages: intergranular Corrosion occurs first, and then denudation generates, at last pitting Corrosion occurs as denudation depth reaches a certain degree. For shot peening aluminum alloy, the denudation depth, mass loss and the total depth of Corrosion Damage are used to represent the Corrosion characteristics. With the Corrosion time increase, the three parameters all increase correspondingly.
Xiao Yan Tong - One of the best experts on this subject based on the ideXlab platform.
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The Design of Image Database about Corrosion Damage of Aluminum Alloy
Applied Mechanics and Materials, 2011Co-Authors: Dong Mei She, Wei Zhang, Xiao Yan TongAbstract:As the data of aluminum alloy Corrosion is increasing, the experimental data and results of Corrosion Damage are collected in this paper, thus the Corrosion Damage draft at different Corrosion time and temperature are obtained. The Oracle 10g is introduced as basic database to design the image database of aluminum alloy Corrosion Damage. The front makes use of the asp.net to realize the web information displaying, meanwhile the Corrosion Damage database of aluminum alloy is realized the image data storage and retrieval. This provides a great convenience for researchers to utilize Corrosion Damage data. At the same time, the database stores the image data effectively, which improves the computer memory usage.
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Corrosion Damage Research of Shot Peening Aluminum Alloy
Applied Mechanics and Materials, 2011Co-Authors: Song Lin, Wei Zhang, Xiao Yan TongAbstract:The pre-Corrosion Damage tests of LC4 aluminum alloy with the shot peening surface treatment and un-shot peening surface treatment are performed under two different time levels: 12h and 24h. Based on the observation of the Corrosion morphology of aluminum alloy, the Corrosion Damage mechanism of shot peening aluminum alloy can be divided into three stages: intergranular Corrosion occurs first, and then denudation generates, at last pitting Corrosion occurs as denudation depth reaches a certain degree. For shot peening aluminum alloy, the denudation depth, mass loss and the total depth of Corrosion Damage are used to represent the Corrosion characteristics. With the Corrosion time increase, the three parameters all increase correspondingly.
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Corrosion Damage Residual Strength Research of Shot Peening Aluminum Alloy
Applied Mechanics and Materials, 2011Co-Authors: You Cui, Wei Zhang, Xiao Yan TongAbstract:The pre-Corrosion Damage tests of LC4 aluminum alloy with the shot peening surface treatment and un-shot peening surface treatment are performed under different time levels. The residual strength has been studied by test after Corrosion Damage. An analysis procedure is developed using 3D reconstruction solid model and finite element analysis to predict residual strength, The relationship of static intensity and the Corrosion Damage are founded. An effective engineering technique for predicting residual strength of corroded structure is established on the base of this studying work.
You Hong Zhang - One of the best experts on this subject based on the ideXlab platform.
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Corrosion Damage of Aluminum Alloy in Unsymmetric Uimethyl Hydrazine and Dinitrogen Tetroxide Liquid Propellant
MATEC Web of Conferences, 2016Co-Authors: You Hong Zhang, Xin Long Chang, Wan Lei LiuAbstract:The high strength aluminum alloy double cantilever beam (DCB) specimens were corroded under the conditions of different liquid propellant environment. After the stress Corrosion exposure, the scanning electron microscopy and energy-dispersal analyses on Corrosion Damage were carried out. The Corrosion Damage sensitivity and the stress Corrosion character of the LD10 high strength aluminum alloy in N 2 O 4 , UDMH and 3.5% NaCl Corrosion solution were analyzed.
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Aging Effect on Corrosion Damage Evolution Behavior of Fuse-Head Used for Electric Explosive Device
Applied Mechanics and Materials, 2012Co-Authors: Shi-ying Zhang, You Hong Zhang, Chun Guo Yue, Xin Long Chang, Qian Bo-zhang, Wan Lei LiuAbstract:Degradation of mechanical properties of electric explosive device fuse-head was serious in different temperature and humidity environments. The objective of this study was to examine the effects of temperature and humidity aging on the Damage evolution behavior of fuse-head used for electric explosive device. In this paper, the experimental studies were presented to appreciate the influence of humidity and temperature on the Corrosion Damage and firing of electric explosive device. The Damage mechanisms and failure modes were determined through nondestructive evaluation. The explosive broken and Corrosion Damage on lead induced by temperature and humidity aging were the main factors affecting the firing probability. At last, the evolution rule of Corrosion Damage in the environment of different relative humidity and temperature was discussed.
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Appraisal Parameters of Corrosion Damage of Aged Aluminum Alloy Material
Applied Mechanics and Materials, 2012Co-Authors: You Hong Zhang, Chun Guo Yue, Xin Long Chang, Shi-ying Zhang, Qian Bo-zhang, Wan Lei LiuAbstract:The Corrosion fatigue character of aluminum alloy material was investigated. The aluminum alloy specimens were pre-corroded in different corrosive solutions and then were tested under fatigue load. The two key parameters of describing Corrosion Damage, surface Corrosion Damage ratio and average depth of Corrosion Damage, were analyzed using experimental observation and finite element method. The preliminary results indicated that the two key parameters could be the appraisal parameters for Corrosion Damage of aluminum alloy structure.
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Life Prediction of Aluminum Alloy Structure Subjected to Corrosion Fatigue and Corrosion Damage
Applied Mechanics and Materials, 2012Co-Authors: You Hong Zhang, Chun Guo Yue, Xin Long Chang, Shi-ying Zhang, Qian Bo-zhang, Wan Lei LiuAbstract:The strength of the aging structure deteriorates mainly as a result of Corrosion and fatigue Damage. In this paper, the life prediction methods of corroded and Corrosion fatigued aluminum alloy structure were proposed. The stress multiplication of aluminum alloy structure subjected to Corrosion Damage was simulated by ANSYS software. We proposed the AFGROW software simulation method to predicate the numerical simulation of Corrosion fatigue crack growth. At last, the life cycles of structures subjected to Corrosion Damage and Corrosion fatigue were estimated, and a very good performance of the proposed methods are achieved after validation with the experimental data.
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Numerical Simulation of the Surface Corrosion Damage Evolution
2009 International Association of Computer Science and Information Technology - Spring Conference, 2009Co-Authors: You Hong Zhang, Rui Zhang, Shengli ZhouAbstract:In this paper, the Corrosion Damage of the aluminum alloy specimens were studied at different temperature for various Corrosion times. The surface Corrosion Damage ratio of aluminum alloy structure was defined to reveal the degree of pit Corrosion intensity. Based on the probability model of pitting Corrosion growth, a new probability model capable of simulating the surface Corrosion Damage is developed and validated. The surface Corrosion Damage evolution is simulated using a Monte Carlo process and a reasonable agreement was found between experimental and calculated results.
E Sosa - One of the best experts on this subject based on the ideXlab platform.
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modelling steel Corrosion Damage in soil environment
Corrosion Science, 2009Co-Authors: Jorge L Alamilla, M A Espinosamedina, E SosaAbstract:Abstract In this work a mathematical model to estimate the localized Corrosion Damage propagation in buried structures has been developed considering physicochemical variables of the environment observed in the field (pH, resistivity, redox potential, and electric potential at the soil–metallic structure interface). The model is based upon the concept that Damage evolution is an irreversible process. According to the results, this model provides an adequate description of Damage evolution and overcomes many of the inconveniences of other models characterized by a power function. The variability of Corrosion Damages is adequately described by the Gumbel probability distribution function, whose parameters are specified by environmental parameters. Model robustness allows the application in professional practice conditions and provides good Damage prediction by using environmental parameters typically measurable in field.
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stochastic modelling of Corrosion Damage propagation in active sites from field inspection data
Corrosion Science, 2008Co-Authors: Jorge L Alamilla, E SosaAbstract:A stochastic model for prediction of Corrosion Damage evolution in active sites, applicable under professional practice conditions is presented here. The Damage of a material and its evolution are determined from the Damage state at a given time instant and the rate of Damage occurrence. To this end, probability density function of the Corrosion Damage depths of the system is estimated and four models to calculate Corrosion Damage velocities at localized defects are shown. Their application depends on the amount of inspection reports available. This work takes into account two settings: the first considers that the system has only one inspection report and the second assumes that there are two inspection reports; this latter setting has two variations, the first, when the same defects can be identified at both inspections, and the second, when they are not identifiable. Furthermore, the work introduces a Bayesian model that allows updating Corrosion Damage velocity on the basis of new measurements found in successive inspection reports. The stochastic model is exemplified by inspection data from a real pipeline system. Its analysis takes into account technical specifications of the system, measured depths of Corrosion defects and the number of defects. Additionally, it considers measurement errors during inspection and the variability of Corrosion phenomenon under field conditions. Model robustness lies in the fact that Corrosion Damage estimates are based on measurements reported during inspections. It implicitly considers multiple factors, such as aggressive chemical environment, microstructure composition, operating conditions (temperature, fluid velocity, etc) intervening in the Corrosion process, as well as their correlations and variability.
J T Bernhard - One of the best experts on this subject based on the ideXlab platform.
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estimation of general Corrosion Damage to steel reinforced mortar using frequency sweeps of guided mechanical waves
Insight, 2006Co-Authors: Benjamin L Ervin, J T Bernhard, Daniel A Kuchma, Henrique ReisAbstract:A frequency sweep from 50 to 200 kHz of guided mechanical waves has been conducted to detect and assess general Corrosion Damage in steel reinforced mortar specimens with seeded defects and in specimens undergoing accelerated Corrosion using impressed current. The sweep was conducted by primarily invoking the fundamental longitudinal mode of propagation, ie the L(0,1) mode. The change in waveform energy (indicative of attenuation) at different frequencies is presented and discussed in terms of general Corrosion Damage. The isolated effects of rebar surrounded by water and mortar are also discussed. Experimental results indicate that general Corrosion Damage can be detected and evaluated by invoking the fundamental longitudinal mode of propagation. Results are presented and discussed within the framework of a Corrosion process degradation model and service life. A review and discussion of the Corrosion process and service life analysis of reinforced concrete is also presented.
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Estimation of Corrosion Damage to steel reinforced mortar using frequency sweeps of guided mechanical waves
Smart Structures and Materials 2006: Sensors and Smart Structures Technologies for Civil Mechanical and Aerospace Systems, 2006Co-Authors: Benjamin L Ervin, J T Bernhard, Daniel A Kuchma, Henrique M ReisAbstract:A frequency sweep from 50 to 200 kHz of guided mechanical waves have been conducted to detect and assess Corrosion Damage in steel reinforced mortar specimens with seeded defects and in specimens undergoing accelerated Corrosion using impressed current. The sweep was conducted by invoking primarily the fundamental longitudinal mode of propagation, i.e., the L(0,1) mode. The decay of waveform energy (indicative of attenuation) at different frequencies is presented and discussed in terms of Corrosion Damage. Experimental results indicate that the percentage of Corrosion Damage can be detected and evaluated invoking the fundamental longitudinal mode of propagation.
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estimation of Corrosion Damage in steel reinforced mortar using guided waves
Journal of Pressure Vessel Technology-transactions of The Asme, 2005Co-Authors: Henrique Reis, Benjamin L Ervin, Daniel A Kuchma, J T BernhardAbstract:Corrosion of reinforced concrete is a chronic infrastructure problem, particularly in areas with deicing salt and marine exposure. To maintain structural integrity, a testing method is needed to identify areas of corroding reinforcement. For purposes of rehabilitation, the method must also be able to evaluate the degree, rate, and location of Damage. Toward the development of a wireless embedded sensor system to monitor and assess Corrosion Damage in reinforced concrete, reinforced mortar specimens were manufactured with seeded defects to simulate Corrosion Damage. Taking advantage of waveguide effects of the reinforcing bars, these specimens were then tested using an ultrasonic approach. Using the same ultrasonic approach, specimens without seeded defects were also monitored during accelerated Corrosion tests. Both the ultrasonic sending and the receiving transducers were mounted on the steel rebar. Advantage was taken of the lower frequency (<250 kHz) fundamental flexural propagation mode because of its relatively large displacements at the interface between the reinforcing steel and the surrounding mortar. Waveform energy (indicative of attenuation) is presented and discussed in terms of Corrosion Damage. Current results indicate that the loss of bond strength between the reinforcing steel and the surrounding concrete can be detected and evaluated.
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Estimation of Corrosion Damage in steel reinforced mortar using waveguides
Nondestructive Evaluation and Health Monitoring of Aerospace Materials Composites and Civil Infrastructure IV, 2005Co-Authors: Henrique Reis, Benjamin L Ervin, Daniel A Kuchma, J T BernhardAbstract:Corrosion of reinforced concrete is a chronic infrastructure problem, particularly in areas with deicing salt and marine exposure. To maintain structural integrity, a testing method is needed to identify areas of corroding reinforcement. For purposes of rehabilitation, the method must also be able to evaluate the degree, rate and location of Damage. Towards the development of a wireless embedded sensor system to monitor and assess Corrosion Damage in reinforced concrete, reinforced mortar specimens were manufactured with seeded defects to simulate Corrosion Damage. Taking advantage of waveguide effects of the reinforcing bars, these specimens were then tested using an ultrasonic approach. Using the same ultrasonic approach, specimens without seeded defects were also monitored during accelerated Corrosion tests. Both the ultrasonic sending and the receiving transducers were mounted on the steel rebar. Advantage was taken of the lower frequency (
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Estimation of Corrosion Damage in Steel Reinforced Mortar Using Guided Waves
Journal of Pressure Vessel Technology, 2005Co-Authors: Henrique Reis, Benjamin L Ervin, Daniel A Kuchma, J T BernhardAbstract:Corrosion of reinforced concrete is a chronic infrastructure problem, particularly in areas with deicing salt and marine exposure. To maintain structural integrity, a testing method is needed to identify areas of corroding reinforcement. For purposes of rehabilitation, the method must also be able to evaluate the degree, rate, and location of Damage. Toward the development of a wireless embedded sensor system to monitor and assess Corrosion Damage in reinforced concrete, reinforced mortar specimens were manufactured with seeded defects to simulate Corrosion Damage. Taking advantage of waveguide effects of the reinforcing bars, these specimens were then tested using an ultrasonic approach. Using the same ultrasonic approach, specimens without seeded defects were also monitored during accelerated Corrosion tests. Both the ultrasonic sending and the receiving transducers were mounted on the steel rebar. Advantage was taken of the lower frequency (
