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chemo-mechanical coupling effect in the high-temperature oxidation of metal materials: A review

Science China(Technological Sciences) 2019年第8期62卷 1246-1254页

作者： WANG HaiLong YU WenShan SHEN ShengPing School of Civil Engineering Chang 'an University Xi'an 710061 China State Key Laboratory for Strength and Vibration of mechanical Structures Shaanxi Engineering Laboratory for Vibration Control of Aerospace Structures School of Aerospace Engineering Xi'an Jiaotong University Xi'an 710049 China

The metal materials are susceptible to be oxidized when they are exposed to the complex and harsh environments, especially at the elevated temperature. The development of corresponding chemo-mechanical coupling theory is indispensable in theoretically and numerically predicting the material properties reduction and failures due to the oxidation. In this paper, we review the historical sketch of the coupling theory of chemical reactions and mechanics in the high-temperature oxidation of metal materials. The oxidation results in the stress generation while the generated stress in turn affects the chemical reaction rate and the diffusion process of the reactants. It is therefore a complex chemo-mechanical coupling problem. This review begins with the discussion of the diffusion-controlled oxidation, and then discusses the stress-dependent diffussion during the oxidation and the oxide growth induced stress, and ends with the discussion of interaction between chemical reactions and stress. This review of chemo-mechanical coupling literature is not exhaustive;we review much of the fundamental literature and draw comparisons of coupling theory development in the filed of metal oxidation.

关键词： oxidation diffusion growth stress chemo-mechanical coupling metal

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chemo-mechanical coupling effect on high temperature oxidation:A review

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Science China(Technological Sciences) 2019年第8期62卷 1297-1321页

作者： FANG XuFei LI Yan YUE MengKun FENG Xue AML Department of Engineering Mechanics Tsinghua University Beijing 100084 China Center for Mechanics and Materials Tsinghua University Beijing 100084 China Institute of Materials Science Technische Universitat Darmstadt Darmstadt 64287 Germany

The rapid development in the field of chemo-mechanical coupling has drawn increasing attention in recent years. chemomechanical coupling phenomena exist in many research areas, ranging from development of advanced batteries, biomechanical engineering, hydrogen embrittlement, and high temperature oxidation, etc. In this review, we attempt to provide an overview of the recent advances in chemo-mechanical coupling study on high temperature oxidation. The theoretical frameworks, computational modeling, and experimental studies on this subject are summarized and discussed. The stress-diffusion coupling effect in diffusion-controlled oxidation process, stress-induced evolution of oxide morphology in microscale experiment, and stressoxidation interaction at crack front for intergranular fracture are highlighted. In addition, potential applications and possible methods via surface engineering for improving oxidation-resistance of high temperature structural materials are briefly discussed.

关键词： chemo-mechanical coupling high temperature oxidation microscale experiment fracture

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A Finite Element Procedure for Analysis of chemo-mechanical Coupling Behavior of Hydrogels

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Computer Modeling in Engineering & Sciences 2016年第7期112卷 33-58页

作者： Wei Wei Qingsheng Yang Department of Engineering Mechanics Beijing University of TechnologyBeijing 100124PR China School of Civil Engineering Hebei University of EngineeringHandan 056038PR China

chemo-mechanical coupling behavior of materials is a transformation process between mechanical and chemical *** this paper,based on the coupled chemo-mechanical constitutive equations and governing equations during isothermal process,the equivalent integral forms of chemo-mechanical coupling governing equations and corresponding finite element procedure are obtained by using Hamilton’s *** isoparametric plane element for chemo-mechanical coupling is associated into ABAQUS finite element package through user element subroutine *** numerical examples exhibit that the ionic concentration variation can cause mechanical deformation and mechanical action can produce redistribution of ionic concentration for *** is proved that the present developed chemo-mechanical coupling finite element procedure can be utilized to model the coupling behavior of hydrogels effectively.

关键词： Hydrogel chemo-mechanical coupling Hamilton’s principle Coupled finite element method

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Theory and Calculation of the J-Integral for Coupled chemo-mechanical Fracture Mechanics

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Computer Modeling in Engineering & Sciences 2018年第6期115卷 387-409页

作者： Wei Wei Qingsheng Yang Xia Liu Xiaoqiao He Kim-Meow Liew School of Civil Engineering Hebei University of EngineeringHandan 056038China Department of Engineering Mechanics Beijing University of TechnologyBeijing 100124China Department of Civil and Architectural Engineering City University of Hong KongTat Chee AvenueKowloonHong Kong

In this paper,by introducing a chemical field,the J-integral formulation is presented for the chemo-mechanical coupled medium based on the laws of thermodynamics.A finite element implementation of the J-integral was performed to study the mode I chemo-mechanical coupled fracture *** derivation of the coupled J-integral,the equivalent domain integral(EDI)method was applied to obtain the mode I J-integral,with expression of the area integrals based on constitutive relationships of a linear elastic small deformation for chemo-mechanical coupling,instead of the finite deformation problem.A finite element procedure is developed to compute the mode I J-integral,and numerical simulation of the y-direction stress field is studied by a subroutine UEL(User defined element)developed in ABAQUS *** of the numerical results obtained using the mode I J-integral was verified by comparing them to a well-established model based on linear elastic fracture mechanics(LEFM).Furthermore,a numerical example was presented to illustrate path-independence of the formulated J-integral for a chemo-mechanical coupled specimen under different boundary conditions,showing a high accuracy and reliability of the present *** variation laws of J-integral and the y-direction stress field with external chemical,mechanical loading and time are *** J-integral value increases with larger external concentration loading in the same integral *** extent of diffusion is much greater with larger concentration,which leads to a stronger coupling effect due to the chemical *** work provides new insights into the fracture mechanics for the chemo-mechanical coupled medium.

关键词： chemo-mechanical coupling fracture J-integral equivalent domain integral(EDI)method finite element method

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Study of Chemical Etching and chemo-mechanical Polishing on CdZnTe Nuclear Detectors

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Journal of Materials Science and Chemical Engineering 2019年第8期7卷 33-41页

作者： Aaron L. Adams Stephen U. Egarievwe Ezekiel O. Agbalagba Rubi Gul Anwar Hossain Utpal N. Roy Ralph B. James Department of mechanical & Civil Engineering and Construction Management Alabama A&M University Huntsville AL USA Nuclear Engineering and Radiological Science Center Alabama A&M University Huntsville AL USA Department of Nonproliferation and National Security Brookhaven National Laboratory Upton NY USA Department of Electrical Engineering and Computer Science Alabama A&M University Huntsville AL USA Department of Physics Federal University of Petroleum Resources Effurun Nigeria Science and Technology Savannah River National Laboratory Aiken SC USA

Cadmium zinc telluride (CdZnTe) semiconductor has applications in the detection of X-rays and gamma-rays at room temperature without having to use a cooling system. Chemical etching and chemo-mechanical polishing are processes used to smoothen CdZnTe wafer during detector device fabrication. These processes reduce surface damages left after polishing the wafers. In this paper, we compare the effects of etching and chemo-mechanical polishing on CdZnTe nuclear detectors, using a solution of hydrogen bromide in hydrogen peroxide and ethylene glycol mixture. X-ray photoelectron spectroscopy (XPS) was used to monitor TeO2 on the wafer surfaces. Current-voltage and detector-response measurements were made to study the electrical properties and energy resolution. XPS results showed that the chemical etching process resulted in the formation of more TeO2 on the detector surfaces compared to chemo-mechanical polishing. The electrical resistivity of the detector is of the order of 1010 Ω-cm. The chemo-mechanical polishing process increased the leakage current more that chemical etching. For freshly treated surfaces, the etching process is more detrimental to the energy resolution compared to chemo-mechanically polishing.

关键词： CdZnTe Chemical Etching chemo-mechanical Polishing Gamma Rays Nuclear Detectors X-Ray Photoelectron Spectroscopy

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Degradation of chemical and mechanical properties of cements with different formulations in CO_(2)-containing HTHP downhole environment

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Petroleum Science 2023年第2期20卷 1119-1128页

作者： Wei Yan Hao-Guang Wei Nguu Dickson Muchiri Fu-Li Li Jing-Ru Zhang Zheng-Xian Xu State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China Sinopec Petroleum Engineering Technology Research Institute Co. Ltd.Beijing102206China

The increasing energy demand has pushed oil and gas exploration and development limits to extremely challenging and harsher HTHP (High Temperature and High Pressure) environments. Maintaining wellbore integrity in these environments, particularly in HPHT reservoirs with corrosive gases, presents a significant challenge. Robust risk evaluation and mitigation strategies are required to address these reservoirs' safety, economic, and environmental uncertainties. This study investigates chemo-mechanical properties degradations of class G oil well cement blended with silica fume, liquid silica, and latex when exposed to high temperature (150 °C) and high partial pressure of CO_(2) saturated brine. The result shows that these admixtures surround the cement grains and fill the interstitial spaces between the cement particles to form a dense crystal system of C–S–H. Consequently, the cement's percentage of pore voids, permeability, and the content of alkali compounds reduce, resulting in increased resistance to CO_(2) corrosion. Liquid silica, a specially prepared silica suspension, is a more effective alternative to silica fume in protecting oil well cement against CO_(2) chemical degradation. Micro-indentation analysis shows a significant deterioration in the mechanical properties of the cement, including average elastic modulus and hardness, particularly in the outer zones in direct contact with corrosive fluids. This study highlights the significance of incorporating admixtures to mitigate the effects of CO_(2) corrosion in HPHT environments and provides a valuable technique for quantitatively evaluating the mechanical-chemical degradation of cement sheath.

关键词： HPHT reservoirs Oil well cement CO_(2)corrosion chemo-mechanical mechanical properties Micro-indentation

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