International Journal of Mechanical Sciences最新文献

{"title":"Inelastic and fracture behaviour of nuclear graphite","authors":"K. Irman ,&nbsp;E.A. Flores-Johnson ,&nbsp;J.J. Kruzic ,&nbsp;W.E. Windes ,&nbsp;T.J. Marrow ,&nbsp;O. Muránsky","doi":"10.1016/j.ijmecsci.2025.110339","DOIUrl":"10.1016/j.ijmecsci.2025.110339","url":null,"abstract":"<div><div>Understanding nuclear graphite's inelastic and fracture behaviour is essential for current and future reactor technologies using graphite-based engineering components. This study compares the behaviour of three nuclear graphite grades, fine-grained IG-110, coarse-grained NBG-18 and medium-grained PCEA, subjected to the uniaxial compression (UC) and the splitting tensile (ST) tests. It was found that the IG-110 graphite has a more favourable combination of ultimate strength and ductility when compared to the NBG-18 and PCEA grades containing large pores acting as strain concentrators. The formation of shear cracks was the primary failure mode under compression, while the formation of a main tension crack in the middle of the specimen was the primary failure mode during the ST test. The inelastic and fracture response was modelled using finite element simulations employing the concrete damaged plasticity (CDP) material model with the dilation angle parameter value selected by two different optimisation processes; a decoupled optimisation was run on the UC and ST models separately, and a coupled optimisation was performed on the UC and ST models running simultaneously. The best predictions were obtained when the value from the coupled optimisation was used. The results showed that the CDP model accurately describes the inelastic behaviour and peak force of all graphite grades and could also capture the failure modes observed experimentally in both UC and ST tests. In particular, the numerical model could capture the crack initiation and propagation path observed in the ST test reasonably well for the IG-110 and PCEA graphite grades.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110339"},"PeriodicalIF":7.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143905942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial scale effect of homogeneous cavitation in liquid aluminum","authors":"Dong-Dong Jiang ,&nbsp;Jian-Li Shao","doi":"10.1016/j.ijmecsci.2025.110340","DOIUrl":"10.1016/j.ijmecsci.2025.110340","url":null,"abstract":"<div><div>Dynamic damage under extreme loading exhibits strong scale-dependent behavior, yet system spatial dimensions remain a critical but underexplored factor in bridging molecular dynamic (MD) simulations to macroscopic cavitation mechanisms. This study investigates the scale effects in the damage and fracture of liquid aluminum across different strain rates using MD simulations and a theoretical model. By systematically varying system sizes (4,000 to 32 million atoms) and strain rates (3.0 × 10⁸/s to 1.0 × 10¹¹/s), we elucidate the interplay between spatial scale, strain rate, and dynamic tensile strength. Key findings reveal that smaller systems exhibit pronounced size-dependent strength due to stochastic void nucleation dominated by thermal fluctuations, while larger systems transition to size-independent behavior governed by collective void interactions. A critical system size threshold emerges, beyond which strain rate becomes the primary determinant of strength. Additionally, we observe that the dispersion in tensile strength decreases with increasing system size due to statistical homogenization of void nucleation. A theoretical model integrating void nucleation kinetics and Rayleigh–Plesset growth dynamics successfully predicts stress evolution and damage mechanisms across scales, validated against MD results and experimental data. The model also reveals a non-monotonic relationship between critical void radius and strain rate, linking this behavior to the size-dependents damage mechanisms. These findings provide essential insights for modeling dynamic damage in liquids and enhance our understanding of scale effects in highly non-equilibrium processes.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110340"},"PeriodicalIF":7.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143905943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermo-viscous acoustics of micro-perforated panel absorbers with coiled cavities","authors":"Hequn Min,&nbsp;Yuchen Zhao,&nbsp;Huading Lou","doi":"10.1016/j.ijmecsci.2025.110341","DOIUrl":"10.1016/j.ijmecsci.2025.110341","url":null,"abstract":"<div><div>Strategic utilization of cavity thermo-viscous effects in micro-perforated panel absorbers (MPAs) with coiled cavities for enhancing broadband noise reduction in ultra-thin compact configurations has received limited attention. This study addresses this critical research gap by systematically investigating the influence of thermo-viscous effects on sound absorption in compact MPAs with parallel coiled-cavities of different depths. An analytical prediction model that effectively incorporates both micro-perforation and cavity thermo-viscous effects is developed to predict absorption coefficients. The model is validated through finite element simulations coupling pressure and thermo-viscous acoustic fields under normal and oblique incidence, as well as impedance tube experiments. Based on the analytical model, detailed parametric studies are conducted on the thermo-viscous effects on MPAs with six parallel coiled sub-cavities, with widths ranging from 16 mm to 1 mm. Normal, oblique, and random incidence conditions are considered for a comprehensive analysis. Results show that cavity thermo-viscous effects within the absorber structure significantly enhance absorption performance by: (1) smoothing valleys in the absorption coefficient spectra within the 500–4000 Hz range, (2) causing slight shifts in absorption peaks, and (3) modifying the pressure distributions within the cavity. The impact of sub-cavity width is particularly pronounced when the width approaches the thickness of thermal and viscous boundary layers attached to cavity walls, revealing the critical role of thermo-viscous boundary layer matching in optimizing absorption performance. Case studies demonstrate that optimizing the sub-cavity width to 1 mm leads to remarkable improvements in average absorption coefficients by 5.4%, 9.8%, and 12.4% over the 260–4000 Hz range under normal, oblique, and random incidence conditions, respectively, achieving approximately 0.9, thereby enabling ultra-thin wideband high-performance absorption structures. This study not only advances the fundamental understanding of thermo-viscous energy dissipation mechanisms but also introduces innovative design strategies that significantly outperform conventional MPAs for next-generation ultra-thin acoustic absorbers in space-constrained applications.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110341"},"PeriodicalIF":7.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143905941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deep learning based multi-cavity blade tip seal optimization","authors":"Shuang Sun ,&nbsp;Xiaopeng Sun ,&nbsp;Boyu Kuang ,&nbsp;Jiaxin Ning ,&nbsp;Peng Zhang ,&nbsp;Guofang Nan","doi":"10.1016/j.ijmecsci.2025.110338","DOIUrl":"10.1016/j.ijmecsci.2025.110338","url":null,"abstract":"<div><div>Tip leakage flow significantly affects both tip loss and the aerodynamic efficiency of turbines. This study presents a novel method for generating high-pressure turbine tip structures using Voronoi diagrams to mitigate tip leakage flow. This geometric strategy, coupled with an efficient optimization framework and a U-Net-based neural network trained on computational fluid dynamics (CFD) data, serves as a rapid surrogate model for predicting tip leakage flow. The surrogate model facilitates efficient optimization of the complex Voronoi geometry using a physics-based genetic algorithm. Comparisons with CFD results indicate that the neural network model exhibits higher prediction accuracy for blade tip static pressure, velocity, and leakage velocity but lower accuracy for cascade passage vorticity, suction surface static pressure, and shear stress. Aerodynamic analysis shows that the optimized tip structure produces targeted cavity formations at different locations along the blade tip. These tailored cavities intensify internal vortex structures and effectively obstruct the leakage flow transport from the pressure side to the suction side. The Voronoi-based blade tip cavity design reduces leakage mass flow by 3.1 % relative to conventional honeycomb blade tips.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"297 ","pages":"Article 110338"},"PeriodicalIF":7.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design of insulation sleeve with tensile stress in electrochemical trepanning","authors":"Erhao Jiao,&nbsp;Dong Zhu,&nbsp;Ruolong Wang,&nbsp;Yunmiao Wang,&nbsp;Xinqun Zhou","doi":"10.1016/j.ijmecsci.2025.110333","DOIUrl":"10.1016/j.ijmecsci.2025.110333","url":null,"abstract":"<div><div>Inner blisk has numerous inner blades, which has high requirements for machining stability and consistency. Electrochemical trepanning (ECTr) is a promising and efficient electrochemical machining (ECM) technology. As an important part of ECTr, the role of insulation sleeve is to inhibit the stray corrosion on the machined blade surface. When inner blade was machined by the profiling insulation sleeve (PIS), and the short circuit phenomenon occurred due to local damage of the PIS at concave side. The fluid force model of the PIS in ECTr was established, and the reasons for local failure were obtained. Subsequently, a novel method and model of the arched insulation sleeve (AIS) based on tensile stress was proposed. The outer contour of the PIS was designed to convert compressive stress into tensile stress at CC side. The fluid-structure coupling optimized simulation was carried out. The results indicated that the AIS adjusts the stress distribution and reduces the maximum deformation at CC side. A dynamic strain signal test platform (DSSTP) was built to verify the effectiveness of the AIS model and simulation. Finally, the ECTr experiments of inner blade were carried out, and the feed rate was increased from 1.6 to 2.4 mm/min by using the AIS. In addition, dozens of blades were continuously machined, and the AIS can be used without damage. The machining repeatability was 0.059 mm, which was 41.6% lower than the PIS, and the machining consistency of inner blades has been improved.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"299 ","pages":"Article 110333"},"PeriodicalIF":7.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analytical model of flat rolling force for corrugated composite sheet","authors":"Yuanming Liu ,&nbsp;Jun Su ,&nbsp;Zhenhua Wang ,&nbsp;Dongping He ,&nbsp;Tao Wang ,&nbsp;Qingxue Huang","doi":"10.1016/j.ijmecsci.2025.110327","DOIUrl":"10.1016/j.ijmecsci.2025.110327","url":null,"abstract":"<div><div>This study presents an analytical model for calculating flat rolling force in corrugated-flat rolling (CFR) using the slab method. The model fully accounts for the shear effect on the vertical sides of the differential element within the deformation zone. By formulating the static equilibrium differential equation and incorporating boundary conditions and yield criteria, key deformation parameters are determined. Experimental validation through flat rolling tests and numerical simulations of Cu/Al corrugated composite sheets confirms the model’s accuracy, with deviations of 0.85% and 2.32% between simulated, measured, and calculated rolling forces. The model is further applied to analyze rolling pressure distributions under two contact states, exploring the effects of shear yield stress and friction factor ratios on rolling pressure and specific horizontal stress. Additionally, the influence of reduction rates, shear yield stress ratios, and friction factor ratios on rolling force and the bottom roll neutral point position is systematically examined. The proposed model provides a reliable theoretical foundation for understanding mechanical behavior in flat rolling, optimizing process parameters, improving composite sheet quality, and advancing CFR technology.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"297 ","pages":"Article 110327"},"PeriodicalIF":7.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Superplastic constitutive modeling of TA32 alloy with two-phase characteristics","authors":"Yang Liu ,&nbsp;Chaoyang Sun ,&nbsp;Zhiqiang Li ,&nbsp;Bing Zhao ,&nbsp;Xintao Zhu ,&nbsp;Sinuo Xu ,&nbsp;Lingyun Qian","doi":"10.1016/j.ijmecsci.2025.110298","DOIUrl":"10.1016/j.ijmecsci.2025.110298","url":null,"abstract":"<div><div>This study proposes a physically-based constitutive model to quantitatively describe both macro-mechanical behavior and dynamic two-phase microstructure evolution of near-α TA32 Ti alloy under superplasticity-favored deformation conditions. The alloy’s microstructure morphology and orientation were observed, encompassing the α to β phase transformation, the steady-state evolution and dynamic coarsening of primary α (α_p) and parent β grain sizes, the simultaneous occurrence of discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) within α phase, and crystallographic orientation stability of the α-Ti lattice. It is demonstrated that grain boundary sliding (GBS) predominates in superplastic deformation. The superplastic constitutive model was developed following the identified two-phase microstructure characteristics and deformation mechanisms, elucidating the relationships among phase fraction, grain size, dynamic recrystallization (DRX) fraction, and dislocation density, while given variations in plastic strain. This model effectively describes the two-phase flow behavior of TA32 alloy during superplastic deformation, considering the dislocation densities of both phases and the effect of phase growth on β grain size. Furthermore, this model was implemented into the VUMAT subroutine to develop a finite element (FE) model enabling accurate prediction of the shape and microstructure distribution in uniaxial tensile specimens. The simulation results show a steady-state grain size and demonstrate excellent predictive capabilities for flow stress and rate-dependent internal state variables both within and outside the calibration range. The superplastic forming (SPF) process of a pyramidal lattice structure was simulated using this model, successfully capturing the evolution of α/β phase characteristics during the forming of geometrically complex TA32 alloy components.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110298"},"PeriodicalIF":7.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143891336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Virtual sensing of blade strain distribution using tip-timing method","authors":"Chunyan Ao ,&nbsp;Jinhu Tian ,&nbsp;Bi Wen ,&nbsp;Baijie Qiao ,&nbsp;Meiru Liu ,&nbsp;Frank Naets ,&nbsp;Xuefeng Chen","doi":"10.1016/j.ijmecsci.2025.110336","DOIUrl":"10.1016/j.ijmecsci.2025.110336","url":null,"abstract":"<div><div>Vibration measurement and analysis are significant for fault diagnosis of turbomachinery rotor blades. It is hard to sense the blade full-field dynamic strain using traditional strain gauges (SGs). Since the non-contact Blade Tip Timing (BTT) technique enables rotating vibration measurement, this study focuses on the virtual sensing of the rotor blade strain distribution via BTT. A new method, named block-enhanced ℓ_1/2-norm strain virtual sensing (BLOSS) method was proposed to recover the blade-tip displacement responses and visualize the strain distribution of the rotor blades under multi-mode vibration. This paper includes three novelties. First, a block-enhanced sparse regularization model by using ℓ_1/2-norm was established to recover the tip response spectrums and identify the vibration parameters. Second, a mapping relationship linking the tip displacement and the strain of the whole blade was analytically expressed based on the system equivalent reduction-expansion process. Third, the periodically changing characteristic of the dynamic strain was revealed under the blade multi-mode vibration superposing the first bending and torsion modes. Based on the BLOSS method, the time-traced displacement response of the blade tip was recovered. The virtual sensing of the blade dynamic strain distribution was achieved at the full field scale based on the mode shapes and the tip displacement of the leading and trailing edges. The strain distribution was perceived and displayed by the contour plots through the updated finite element model of the rotor blade. The proposed method was validated through both a numerical case and a spin test. The strain responses via virtual sensing were compared with those measured by SGs. The comparison showed that the relative errors of frequency identification are within 0.6 % and the mean relative error of the strain amplitude is 6.9 %. The BLOSS method enables the identification of vibration parameters and virtual sensing of the rotor blade strain distribution in a non-contact manner, which is promising to achieve blade online health monitoring.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"297 ","pages":"Article 110336"},"PeriodicalIF":7.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143918010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 Digital twin framework for Visco-Hyperelasticity calibration: Experiment and simulation","authors":"S. Rasoul Varedi ,&nbsp;Bart Buffel ,&nbsp;Frederik Desplentere","doi":"10.1016/j.ijmecsci.2025.110310","DOIUrl":"10.1016/j.ijmecsci.2025.110310","url":null,"abstract":"<div><div>Modeling heavy gauge vacuum-assisted thermoforming is challenging due to material deformation, time-dependent behavior, and mould-sheet friction. This study develops an adaptive methodology that integrates Finite Element Model Updating (FEMU) to calibrate the visco-hyperelastic properties of ABS thermoplastic material within the thermo-vacuum forming range. Experimental data from a 3D Digital Image Correlation (DIC)-equipped biaxial bubble inflation test and step-strain relaxation tests were used to characterize the material behavior at 140 °C. A 2-term Ogden model combined with a Prony series captured material behavior. The objective function minimizes the Root Mean Square (RMS) error between experimental and simulated strain data, focusing on equibiaxial deformation at the bubble’s pole. The calibrated visco-hyperelastic model is further assessed under off-center biaxial deformation modes during bubble formation, leveraging the unique advantage of the bubble inflation test in capturing multiple deformation modes simultaneously. By integrating a real-time digital twin approach, an adapting method is proposed to dynamically optimize friction coefficient using strain evolution data from the contact zone during thermoforming. This ensures a more representative characterization of friction under actual forming conditions, capturing the interaction between the mould and the thermoplastic sheet more effectively. Subsequently, a vacuum-assisted thermoforming simulation on a positive semi-spherical mould was performed to validate the calibrated model. The thickness distribution along the centerline of the sheet showed strong agreement with experimental data, particularly in capturing the thinning effect in highly stretched regions near the corner. This research improves predictive modeling for industrial thermoforming processes.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110310"},"PeriodicalIF":7.1,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Nonlinear viscoelasticity of incompressible isotropic solids","authors":"Jinlai Zhou,&nbsp;Gengchao Yang,&nbsp;Qinghe Yao","doi":"10.1016/j.ijmecsci.2025.110330","DOIUrl":"10.1016/j.ijmecsci.2025.110330","url":null,"abstract":"<div><div>The development of isotropic nonlinear viscoelastic solid constitutive models constitutes an integral part of solid mechanics. In this work, a general constitutive behavior framework for nonlinear viscoelastic solid materials is developed via systematic stress relaxation and creep experiments on polypropylene (PP). Results indicates that the infinite hyperelastic-plastic constitutive behavior serves as the sole physical boundary for evaluating structural delayed stability. Thus, the threshold stress between low-stress creep stability and high-stress creep fracture of nonlinear viscoelastic solid is determined. It is revealed that the nonlinear viscoelastic constitutive behavior represents a convergence process from instantaneous hyperelasticity to infinite hyperelasticity. To fully characterize their relaxation and creep viscoelastic properties, we propose a novel architecture based on series-parallel combinations of hyperelastic springs and dampers. By integrating Maxwell and Kelvin linear viscoelastic theories with the incompressible Mooney-Rivlin hyperelastic model, we develop incompressible nonlinear viscoelastic stress relaxation and creep constitutive models. The developed models exhibit excellent predictive performance. Boltzmann's equations are derived based on the Boltzmann nonlinear superposition principle, revealing the constitutive relations for nonlinear solids. These equations establish a connection between special and generalized relaxation / creep constitutive behaviors. This research focuses on small deformations in incompressible solids, laying the groundwork for future investigations into large deformations in compressible solids.</div></div>","PeriodicalId":56287,"journal":{"name":"International Journal of Mechanical Sciences","volume":"296 ","pages":"Article 110330"},"PeriodicalIF":7.1,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}