International Journal of Pressure Vessels and Piping最新文献

{"title":"Study on dynamic strain aging and thermal aging on mechanical behavior of Alloy 709 using an improved unified viscoplastic constitutive model","authors":"Xiaohui Chen,&nbsp;Xu Zhao,&nbsp;Xiaodong Cui,&nbsp;Xiaoyue Zhang","doi":"10.1016/j.ijpvp.2025.105613","DOIUrl":"10.1016/j.ijpvp.2025.105613","url":null,"abstract":"<div><div>Taking Alloy 709 for Sodium-cooled Fast Reactor (SFR) operating conditions as the research object, an improved unified viscoplastic model (UVM) is established to simulate the uniaxial tension at the temperature range of 25 °C–800 °C and the cyclic viscoplastic behaviors at 550 °C and 650 °C for different ageing time. Within the temperature range 455∼650 °C, the dynamic strain aging (DSA) effect is found. Therefore, the influence of operating temperature on the mechanical behavior of Alloy 709 was introduced through an exponential function into the dynamic recovery of the hardening framework. Moreover, the influences of DSA effect and aging times on the yield stress and the kinematic hardening parameters are also considered into the UVM to realize the change of mechanical behaviors of the material under thermal aging conditions. To assess the accuracy and the predictive capability of the improved UVM, uniaxial tension tests at the temperature range of 25 °C–800 °C, and CFI tests at 550 °C and 650 °C are conducted under the ageing time, 100h and 2000h, respectively. A good correlation is obtained between the simulated results and the experiment data.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"218 ","pages":"Article 105613"},"PeriodicalIF":3.5,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Improving fatigue testing of AISI 304L stainless steel in high temperature water regarding their complex hardening and softening material behaviour","authors":"Georg Veile ,&nbsp;Jürgen Rudolph ,&nbsp;Nina Grözinger ,&nbsp;Martin Herzig ,&nbsp;Michael Grimm ,&nbsp;Stefan Weihe","doi":"10.1016/j.ijpvp.2025.105612","DOIUrl":"10.1016/j.ijpvp.2025.105612","url":null,"abstract":"<div><div>For multiple strain amplitudes the complex material behaviour of the austenitic stainless steel AISI 304L has been modelled with an analytical function to replicate hardening, softening and secondary hardening during strain-controlled cyclic loading at the elevated temperature of 240 °C. This material behaviour was then replicated for fatigue testing in corrosive medium conditions (high temperature water) at 240 °C and 70 bar, where no local strain control could be applied to the specimen without incurring the risk of reduced fatigue life. Thus, avoiding conservative assumptions at the experimental execution determining the fatigue life of the material. The resulting stress amplitudes in high temperature water environment coincided to the stress amplitudes in ambient air and also demonstrated the distinctive hardening and softening behaviour of the investigated material.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"218 ","pages":"Article 105612"},"PeriodicalIF":3.0,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144703824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of tempering time on microstructure and residual stress of surfacing weldments of thin tube sheets","authors":"Haiyang Xue,&nbsp;Xiao Li,&nbsp;Shijun Xiao,&nbsp;Mengzhe Yan","doi":"10.1016/j.ijpvp.2025.105611","DOIUrl":"10.1016/j.ijpvp.2025.105611","url":null,"abstract":"<div><div>Strip electrode electroslag welding was applied to deposit a weld overlay on Q345R thin tube sheets with dimensions of Φ600mm × 20 mm.After welding, four specimens were subjected to heat treatment with varying tempering durations.Post-welding, the matrix microstructure of the EQ309MoL weld overlay consists of austenite and interdendritic ferrite with a dendritic morphology at grain boundaries, while the Q345R base metal near the weld exhibits a microstructure of bainite and acicular ferrite.Following heat treatment, significant carbide precipitation was observed at the austenite grain boundaries in the weld overlay. Moreover, the extent of carbide precipitation increased with prolonged tempering time, and the precipitates were identified as M23C6.The thin tube sheet weldments exhibited the highest residual stress in the as-welded condition, with a magnitude approaching their yield strength (469 MPa). As tempering time increased, the residual stress gradually decreased; after 3 h of tempering, it stabilized at approximately 100 MPa.In the as-welded state, the weldments showed the highest dislocation density, with numerous dislocations accumulating at grain boundaries and within grains. This led to the formation of dislocation tangles and internal strains, resulting in further dislocation accumulation and stress field concentration within grains and near grain boundaries.After tempering, elevated temperatures provided the driving force for dislocation glide, reducing dislocation accumulation and intersections, decreasing dislocation density, and promoting uniform dislocation distribution. This alleviated dislocation accumulation and stress concentration at grain boundaries and within grains, thereby reducing residual stress in the weld overlay.The maximum grain size was 990304 μm² in the as-welded state, 1122848 μm² after 1 h of tempering, 1274160 μm² after 2.5 h, and 1544880 μm² after 3 h.Grain growth was accompanied by homogenization of grain size distribution, which reduced deformation incompatibility caused by variations in grain size and thus lowered the risk of stress concentration.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"218 ","pages":"Article 105611"},"PeriodicalIF":3.0,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144711153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Crack arrest analysis of dense-phase CO2 pipelines reinforced with CFRP wraps using a coupled fluid–structure–damage model","authors":"Zhenxi Liu ,&nbsp;Lei Chen ,&nbsp;Fanfan Qiao ,&nbsp;Xingqing Yan ,&nbsp;Shuai Yu ,&nbsp;Jianliang Yu","doi":"10.1016/j.ijpvp.2025.105610","DOIUrl":"10.1016/j.ijpvp.2025.105610","url":null,"abstract":"<div><div>Carbon capture, utilization, and storage (CCUS) technologies are widely regarded as critical pathways toward achieving carbon peaking and carbon neutrality goals, where the pipeline transportation of CO₂ plays a pivotal role. Due to the extended decompression plateau of CO₂ in dense-phase or supercritical states, pipeline rupture events can lead to rapid crack propagation because the crack tip pressure cannot be relieved promptly, potentially triggering long-range ductile fracture (RDF) accidents. Therefore, investigating crack propagation control and arrest technologies for CO₂ pipelines holds significant engineering value. In this study, the effectiveness of carbon fiber composite crack arrestors in mitigating crack propagation in dense-phase CO₂ pipelines was systematically evaluated through a combined approach of numerical simulations and full-scale burst tests. Firstly, fracture strain data under multiple stress triaxialities were extracted based on different tensile specimen types to calibrate the Johnson–Cook (J–C) damage model. A finite element model incorporating an initial crack was developed. The coupled Eulerian–Lagrangian (CEL) method was employed to simulate the fluid–structure interaction (FSI) between dense-phase CO₂ decompression behavior and crack propagation, while the Hashin damage criterion was applied to the composite arrestor to accurately capture its failure evolution mechanisms. The crack propagation velocity and path were measured and validated through self-designed full-scale CO₂ pipeline burst tests. Results demonstrated that the external carbon fiber composite arrestor significantly reduced crack propagation speed and length, thereby enhancing the fracture control capacity of dense-phase CO₂ pipelines. The simulation predictions showed good agreement with experimental data, verifying the accuracy and applicability of the developed FSI–damage coupled modeling approach. Furthermore, a parametric study was conducted to systematically analyze the effects of arrestor layer, axial length, and initial pipeline pressure on the arrest performance, and minimum design parameters for crack arrestors were proposed. This study establishes a \" CO₂–pipeline damage–composite crack arrestor Hashin damage model\" framework, providing theoretical references and engineering guidance for the design and optimization of novel composite crack arrestors for CO₂ pipelines.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"218 ","pages":"Article 105610"},"PeriodicalIF":3.5,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144722980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolution of microstructure and crystallographic texture of high-frequency electric-resistance welded X65 pipeline steel","authors":"Jin Yu ,&nbsp;Juan Jia ,&nbsp;Xinli Song ,&nbsp;Leilei Sun","doi":"10.1016/j.ijpvp.2025.105609","DOIUrl":"10.1016/j.ijpvp.2025.105609","url":null,"abstract":"<div><div>The microstructure and texture evolution in X65 steel pipe high-frequency electric-resistance welding (HF-ERW) zones under as-welded and heat-treated conditions were investigated in this study. Dynamic recrystallization occurs in austenite within the bondline and coarse-grained heat-affected zone (CGHAZ), but in ferrite within the fine-grained heat-affected zone (FGHAZ). The CGHAZ exhibits higher residual stress than the FGHAZ. The thermomechanical-affected zone (TMAZ) exhibits only dynamic recovery and deformation. The grain orientations in the weld zone and matrix were similar under compressive stress direction (weld zone-TD, matrix-ND). Along TD, the bondline, CGHAZ and FGHAZ develop {111} recrystallization textures, whereas TMAZ forms {100}&lt;011&gt; and {111} deformation textures. After heat treatment, the weld zone retains the texture characteristics of the as-welded condition. Conventional heat treatment increases harmful &lt;100&gt;//TD and &lt;110&gt;//TD texture components in the CGHAZ, whereas optimized treatment reduces these components, enhances high-angle grain boundaries, and refines grains. These texture components originate from {110}&lt;001&gt;, {100}&lt;011&gt;, and {110}&lt;110&gt; orientations formed during welding thermo-mechanical processes. They intensify in the CGHAZ after conventional treatment due to residual stresses but weaken after optimized treatment through phase transformation effects. This provides valuable insights into texture development during welding.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"218 ","pages":"Article 105609"},"PeriodicalIF":3.0,"publicationDate":"2025-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144703935","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of overheating on microstructure and mechanical properties of Cr-Mo steel hydrogenation reactors","authors":"Juanbo Liu ,&nbsp;Zhiyuan Han ,&nbsp;Guoshan Xie ,&nbsp;Jun Li ,&nbsp;Sheng Chen ,&nbsp;Meng He","doi":"10.1016/j.ijpvp.2025.105608","DOIUrl":"10.1016/j.ijpvp.2025.105608","url":null,"abstract":"<div><div>Hydrogenation reactors are critical equipment in the petrochemical industry, where overheating phenomenon (temperature runaway) poses a significant threat to their structural integrity. This article performs the short-time overheating investigation at different temperatures (600 °C, 700 °C, 800 °C, 900 °C) and time (2 h, 6 h, and 10 h) as well as the long-time overheating investigation at 500 °C for 14000 h. The evolution of microstructure and mechanical properties is further characterized with the metallographic analysis, tensile testing, impact testing, hardness testing and scanning electron microscopy (SEM). The results demonstrate that short-time exposure at 600 °C and 700 °C enhances material toughness without causing deterioration, while 800 °C emerges as a critical threshold leading to a pronounced variation of microstructure and mechanical properties. Upon reaching or exceeding 900 °C, the material undergoes severe deterioration. For the long-time overheating at 500 °C for 14000 h, a remarkable embrittlement appears but it still enabling safety operation. To mitigate the risk of catastrophic failures, hydrogenation reactors that have experienced overheating above 900 °C warrant thorough evaluation and must be handled with utmost caution during reuse considerations. These findings provide critical guidance for assessing and managing overheating incidents in industrial hydrogenation reactors.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"218 ","pages":"Article 105608"},"PeriodicalIF":3.5,"publicationDate":"2025-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A comprehensive review of in-service pipeline repair methods with a focus on axial strain capacity","authors":"Mohammad Hosseini ,&nbsp;Hossein Daneshvar ,&nbsp;Ali Fathi ,&nbsp;Nasser Daiyan ,&nbsp;Eric Lepine","doi":"10.1016/j.ijpvp.2025.105607","DOIUrl":"10.1016/j.ijpvp.2025.105607","url":null,"abstract":"<div><div>Pipelines provide a reliable, cost-effective transport method for oil and gas products. However, their integrity can be threatened by defects and geohazards, making in-service repair methods crucial for maintaining safety, ensuring continuous operation, and supporting long-term sustainability. This review evaluates different in-service pipeline repair methods focusing on axial strain capacity. Repair is crucial for pipeline integrity in geohazard-prone regions where ground movements, such as landslides and subsidence, can induce significant axial strain. The review provides an in-depth analysis of these repair methods' design functionality and real-world applications while discussing their challenges and recent advancements. A comparative assessment of repair methods based on defect coverage, ease of execution, flexibility, and cost-effectiveness is included to select the most suitable repair techniques. Additionally, the review identifies current challenges in improving axial strain capacity and underscores the importance of future research. Further studies are required to optimize sleeve geometry and weld configurations, improve installation practices, and investigate the long-term behavior and interfacial bonding of grout and filler materials, as these factors are critical to enhance axial and hoop strain capacities and improve the pipeline's overall resilience and longevity.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"218 ","pages":"Article 105607"},"PeriodicalIF":3.0,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144663051","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Novel ideas for analytical dynamic stress and large deformation analyses of thick hyperelastic cylindrical pressure vessels under sudden magneto-thermo-mechanical loads","authors":"M. Shariyat,&nbsp;M.J. Ebrahimi","doi":"10.1016/j.ijpvp.2025.105606","DOIUrl":"10.1016/j.ijpvp.2025.105606","url":null,"abstract":"<div><div>The present work investigates analytically the time-dependent distributions of the stresses and large displacements in abruptly pressurized thick-walled magneto-thermo-hyperelastic cylinders exposed to a magnetic field and radial temperature gradients that vary with the instantaneous large thickness variations of the pressure vessel. The governing equations are derived through the definition of an augmented free energy density function that accounts for the mechanical, thermal, and magnetic energies, analytical incorporation of the mechanical incompressibility condition, and employing a Mooney-Rivlin-type hyperelastic constitutive model. Since the resulting highly nonlinear analytical integrodifferential equations that govern the instantaneous configuration of the cylinder contain both the time derivatives and spatial integrals of the instantaneous radii, the resulting coupled nonlinear time-dependent governing equations are solved by utilizing an iterative scheme that engages the second-order Runge-Kutta time-marching and trapezoidal spatial integration (based on nonuniform distribution of the grid points) techniques. The results reveal that when the ends of the soft cylinder are confined, the magnetic actuation leads to through-thickness contraction and Poisson's-ratio-inspired radial expansions and tensile hoop stresses, increases in the structural rigidity, and reductions in the magnitudes and fluctuations of the displacement and stress components. The impact of the magnetic field on the responses diminishes asymptotically for thicker cylinders. Moreover, the temperature gradient leads to releases in both displacements and stresses.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"218 ","pages":"Article 105606"},"PeriodicalIF":3.0,"publicationDate":"2025-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144654425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of ultimate tensile strength of tubular materials using Ring Hoop Tension Test with cylindrical pins","authors":"Jose Calaf-Chica,&nbsp;María. J. García-Tárrago,&nbsp;Mónica Preciado-Calzada,&nbsp;Pedro M. Bravo-Díez","doi":"10.1016/j.ijpvp.2025.105598","DOIUrl":"10.1016/j.ijpvp.2025.105598","url":null,"abstract":"<div><div>Mechanical characterization of metallic pipes is essential for assessing their structural integrity in industrial applications. The Ring Hoop Tension Test (RHTT) offers a simpler alternative to traditional methods for determining hoop strength, with two primary variants: the D-shaped pin configuration, which requires custom tooling for each pipe geometry, and the cylindrical pin system, which simplifies testing but introduces bending stresses. While the cylindrical pin method reduces friction-related uncertainties, its applicability for estimating ultimate tensile strength (UTS) had not been explored. This study develops a correlation between the minimum slope of the RHTT load–displacement curve and UTS in the hoop direction, specifically for cylindrical pins.</div><div>A dual approach combining finite element analysis (FEA) and experimental validation was employed. Numerical simulations examined the influence of pipe slenderness, pin diameter, and strain-hardening behavior, leading to an empirical model. Experimental tests on aluminum 6061-T6 pipes confirmed the method’s accuracy, with deviations below 3 % compared to standard tensile tests. The results highlight the impact of geometric factors, particularly the diameter-to-thickness ratio, and introduce a pin-size correction factor to refine the methodology. This work demonstrates that RHTT with cylindrical pins can effectively estimate UTS, offering a practical and reliable alternative to conventional methods.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"218 ","pages":"Article 105598"},"PeriodicalIF":3.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144631538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure-property relationships in electron beam welded SA508 nuclear reactor pressure vessel steel","authors":"Elliot H. Marrero-Jackson ,&nbsp;Jasmyne N. Emerson ,&nbsp;Grayson A. Nemets ,&nbsp;Jack R. Herrema ,&nbsp;Benjamin Sutton ,&nbsp;David W. Gandy ,&nbsp;Maria A. Okuniewski ,&nbsp;Janelle P. Wharry","doi":"10.1016/j.ijpvp.2025.105605","DOIUrl":"10.1016/j.ijpvp.2025.105605","url":null,"abstract":"<div><div>The objective of this study is to understand structure-property relationships across electron beam (EB) welds on nuclear reactor pressure vessel (RPV) steel SA508, Grade 3. Modern nuclear reactor designs typically rely on single-forging RPVs in an effort to eliminate arc welds that require costly in-service inspection. By comparison, advanced EB welds are being considered for RPV applications as they can be rapidly produced, quality heat treated, and often exhibit fewer impurities and narrower heat-affected zones (HAZ). But little is known about microstructure evolution during EB welding and its implications on mechanical properties. This work identifies key structure-property relationships in electron beam welds on forged SA-508 and on a powder metallurgy with hot isostatic pressing (PM-HIP) compact produced to match the SA508 Grade 3 chemical composition. In both the forging and PM-HIP compact, the EB weld fusion zone and HAZ exhibit significant hardening due to martensite nucleation during rapid cooling, while the base metal retains a dual-phase ferrite-bainite microstructure. An appropriately designed heat treatment can eliminate hardness gradients by homogeneously recrystallizing a ferrite-bainite microstructure across the weldment. While PM-HIP and forged SA508 exhibit similar EB weld-induced microstructure evolution, the more extensive porosity in the PM-HIP specimen promotes grain growth and stabilizes ferrite and martensite. Hardness is governed by ferrite phase contiguity, wherein dislocation transmission is inhibited at dissimilar phase interfaces. But if the microstructure is dominated by bainite and/or martensite, hardness is instead governed by their phase fractions. This work illustrates the potential for combining EB welding and PM-HIP with an appropriate quality heat treatment to create RPV welds having negligible microstructure gradients and consistent hardening micro-mechanisms.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"218 ","pages":"Article 105605"},"PeriodicalIF":3.5,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}