Archives of Civil and Mechanical Engineering最新文献

{"title":"Exploring the synergistic mechanisms of mechanical, microstructural morphology, and corrosion characteristics in inconel 718-AISI 430 dissimilar weldment joints using ERNiCrMo-4 and ER2209 fillers: a comparative performance analysis","authors":"Balram Yelamasetti,&nbsp;B. Tulasi Lakshmi Devi,&nbsp;B. Omprakash,&nbsp;Chilakamarri L. Aslesha,&nbsp;Sagar Shelare,&nbsp;Shubham Sharma,&nbsp;V. Nagabhushana Rao,&nbsp;Ehab El Sayed Massoud","doi":"10.1007/s43452-025-01155-0","DOIUrl":"10.1007/s43452-025-01155-0","url":null,"abstract":"<div><p>The comparative study is made on dissimilar weldments of Inconel 718 and ferritic stainless steel 430 joined by pulsed current tungsten inert gas welding process using ERNiCrMo-4 and ER2209 fillers. The base metals were joined with multiple welds passes by keeping pulse frequency (4 Hz) constant. The samples were examined for internal defects using X-ray radiography along with visual inspection. To understand the weldability of two different fillers, the mechanical properties were assessed by conducting a tension test as well as the hardness measurement. The macro/microstructures were revealed at various zones using an optical microscope with different magnifications. Further, for measuring the corrosion rate at fusion zone, the weld surface area of 0.1257 cm² was submerged in a 3.5% NaCl solution. The weld strength of 542 MPa was observed for ERNiCrMo-4 weldment whereas 469 MPa was observed for ER2209 filler weldment. Higher yield strength to weld strength was observed in ERNiCrMo-4 filler weldment than in the ER2209 filler weldment. ERNiCrMo-4 filler weld exhibited better hardness (198 HV) at the weld zone than the ER2209 filler weld (185 HV). The presence of a fine-grained structure at the interface of ferritic stainless steel 430 provides evidence of efficient blending and solidification in ERNiCrMo-4 filler weld. Whereas the elongated grains and secondary phases could potentially reduce the strength of ferritic stainless steel 430 in ER2209 filler weld. The corrosion resistance of ER2209 weldment (1.117 mm/year) is higher than the ERNiCrMo-4 weldment (1.353 mm/year) because of the presence of fine grain structures along with higher dense filler alloy elements.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143465952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical fracture of lattice structures fabricated by selective laser sintering","authors":"Mohammad Reza Khosravani,&nbsp;Sören Bieler,&nbsp;Kerstin Weinberg,&nbsp;Tamara Reinicke","doi":"10.1007/s43452-025-01149-y","DOIUrl":"10.1007/s43452-025-01149-y","url":null,"abstract":"<div><p>The current study is focused on the static and dynamic behavior of different 3D-printed lattice structures fabricated by selective laser sintering (SLS) technique. To this end, body-centered cubic and face-centered cubic lattice structures were designed and printed using polyamide 12 (PA 12) material. A series of compression tests were performed on the lattice specimens under static loading conditions. We used the conventional split Hopkinson pressure bar (SHPB) at the impact speed of 12 m/s to determine the dynamic behavior of 3D-printed structures under high strain rate. In experimental practices, a high-speed camera was utilized as non-contact optical technique to document the process from initial impact till the specimen failure. In addition, finite element models were developed to determine the dynamic mechanical response of the lattice models. The experimental results indicated that the compressive strength increased with the loading rate. It confirmed the strain rare sensitivity of the studied PA 12. The results of this study can be employed to enhance the design of 3D-printed lattice structures for their further engineering applications.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s43452-025-01149-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of power on the microstructure and mechanical properties of 1500 MPa martensitic steel joints in laser-assisted friction stir welding","authors":"Shuhao Zhu,&nbsp;Xiangxiang Zhu,&nbsp;Wenyuan Lv,&nbsp;Junqi Chen,&nbsp;Yufeng Sun,&nbsp;Lihong Wu,&nbsp;Hidetoshi Fujii,&nbsp;Shaokang Guan","doi":"10.1007/s43452-025-01148-z","DOIUrl":"10.1007/s43452-025-01148-z","url":null,"abstract":"<div><p>This study employs laser-assisted friction stir welding (FSW) to join martensitic steels, aiming to produce defect-free welds. A comparative analysis was conducted to examine how varying laser power influences the evolution mechanisms in different weld zones and enhances joint mechanical properties. The experiments demonstrated successful defect-free welds across a range of laser powers. With increasing laser power, the stir zone (SZ) expanded, and the hierarchical martensitic structure grew progressively larger. At 250 W, the SZ exhibited block tempered martensite due to extended tempering, whereas strip tempered martensite formed at other power levels. The thermo-mechanically affected zone (TMAZ) exhibited a reduction in ferrite content of up to 24.0% as laser power increased, along with increases in the kernel average misorientation (KAM) value and the fraction of deformed grains, which rose by up to 28.3% and 86.2%, respectively. In the heat-affected zone (HAZ), martensite tempering facilitated the precipitation of fine Fe₃C particles, which became more spherical morphology and grew in diameter by up to 59.0%. At 750 W, the FSW joints and SZ achieved the highest ultimate tensile strength (UTS), with increases of up to 8.4% and 9.2%, respectively. These improvements were attributed to minimal ferrite content in the TMAZ and reduced tempering in the SZ.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 lightweight deep learning model DICNet3+ for large deformation measurement in digital image correlation","authors":"Yaoliang Yang,&nbsp;Lingyun Qian,&nbsp;Chaoyang Sun,&nbsp;Jiaqiao Zhang,&nbsp;Yinghao Feng,&nbsp;Jingchen Liu","doi":"10.1007/s43452-025-01147-0","DOIUrl":"10.1007/s43452-025-01147-0","url":null,"abstract":"<div><p>Accurate deformation measurement is essential for evaluating material performance in complex mechanical testing. Although the traditional digital image correlation method is widely used, it faces limitations, such as boundary instability and erroneous data due to speckle pattern tearing, especially in large deformation scenarios. To address these challenges, this study proposes a lightweight deep learning model DICNet3+ , which is based on a modified UNet3+ architecture incorporating depthwise separable convolutions and convolutional block attention modules. These enhancements improve feature extraction while minimizing the number of parameters, enabling accurate prediction of displacement fields in large deformation scenarios. A comprehensive dataset consisting of both real and simulated speckle patterns, and a weighted hybrid loss function that combines root mean square error and average endpoint error were developed to train and validate the model. The results demonstrated that the DICNet3+ model significantly outperformed existing deep learning-based DIC models in terms of accuracy, robustness, and generalization. Additionally, the DICNet3+ model provided reliable predictions even in regions with erroneous data or along boundaries and showed significant computational efficiency compared to ARAMIS software in compression experiments, particularly when GPU acceleration was used. This work made DICNet3+ a viable solution for large deformation measurements in engineering applications.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fusion of rotation and translation measurements to improve mass identification in beam structures","authors":"Piotr Adam Bońkowski,&nbsp;Piotr Bobra,&nbsp;Zbigniew Zembaty","doi":"10.1007/s43452-025-01152-3","DOIUrl":"10.1007/s43452-025-01152-3","url":null,"abstract":"<div><p>Mass identification of vibrating structures is part of complex and often numerically inefficient inverse problems of structural dynamics. This paper investigates the application of novel rotation rate sensors to improve experimental mass identifications in rod structures. For this purpose, translational and rotational vibration measurements are used in the modal analyses and the model updating techniques. Numerical simulations were conducted with various added mass configurations investigated, followed by an extensive experimental campaign on a steel beam in free-free conditions. It is demonstrated that including the rotational degrees of freedom in the model updating technique dramatically improves the effectiveness of mass localisation and quantification. This positive effect is particularly pronounced when a limited number of modes is available from modal extraction.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bond–slip behavior of 1.4362 duplex stainless steel bar embedded in concrete","authors":"Xiao Ge,&nbsp;Tai-Lin Liu,&nbsp;Yan-Hui Liu,&nbsp;Zhi-Guo Sun,&nbsp;Yu-Qing Yang,&nbsp;Mohammad M. Kashani,&nbsp;Dong-Sheng Wang","doi":"10.1007/s43452-025-01142-5","DOIUrl":"10.1007/s43452-025-01142-5","url":null,"abstract":"<div><p>Stainless steel reinforcement is widely used in reinforced concrete structures due to its good corrosion resistance and mechanical properties. In this work, a set of pullout tests on 20 types of specimens are presented. Tensile tests on stainless steel rebars with different diameters and carbon steel rebars are conducted to determine the mechanical properties of rebars. Compressive tests on cubic concrete specimens with different grades are conducted to determine the mechanical properties of concrete. The design of specimens for pullout tests considers the effects of concrete grade, rebar material, rebar diameter, specimen shape, bond length, concrete cover length, rebar position, and stirrups. The damage observation is recorded. The experimental results are compared with the models provided by the Chinese code for the design of concrete structures (GB/50010-2010). With the experimental data, the coefficients of the model are modified by linear fitting. The comparison of bond–slip curves between experimental data and the modified code model is presented. Experimental results indicate that bond strength increases with increasing concrete grades, bar diameter, bond length and concrete cover depth. However, the bond strength between stainless rebar and concrete is smaller than that of carbon steel rebar and concrete. The modified model can produce a better prediction of the bond–slip relation between stainless rebar and concrete.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pulsed GTAW joint of P92 steel and Inconel 625: microstructure and mechanical properties","authors":"Sachin Sirohi,&nbsp;Amit Kumar,&nbsp;Manohar Singh,&nbsp;Dariusz Fydrych,&nbsp;Chandan Pandey","doi":"10.1007/s43452-025-01153-2","DOIUrl":"10.1007/s43452-025-01153-2","url":null,"abstract":"<div><p>In the present work, the relationship between microstructure and mechanical properties has been investigated for the dissimilar welded joint of P92 steel and Inconel 625, fabricated using the pulsed current gas tungsten arc welding (GTAW) process. Microstructural investigation revealed that the pulsed current resulted in finer equiaxed dendrites in the bulk weld metal, while columnar dendrites were observed in the weld metal near the interface. A more uniform distribution of the fine secondary phases was observed in FESEM study. The EDS study of the inter-dendritic areas showed alloying element segregation throughout the weld metal, with higher density near the interface. This segregation led to the formation of secondary phases, specifically MC-type carbides (NbC, TiC), which was confirmed by the EDS analysis. The characterization of the interface between P92 steel and ERNiCrMo-3 filler weld revealed the presence of a filler-deficient zone, marked by features such as islands, peninsulas, and unmixed zones. Elemental diffusion and segregation of Nb, Mo, and Ti at the interface were also confirmed through EDS analysis. Tensile testing demonstrated acceptable tensile properties of the welded joint at room temperature, with a tensile strength of 764 ± 8 MPa and elongation of 33 ± 1%, with the sample failing from the P92 base metal. Significant hardness variations were observed along the welded joint, with the most notable changes occurring in the P92 heat-affected zone (HAZ). A maximum hardness of 420 HV was recorded in the coarse-grained HAZ of P92, while the inter-critical HAZ of P92 showed a minimum hardness of 215 HV. In addition, considerable hardness variation was noted within the weld metal, corresponding to each welding pass as well as across the transverse direction of the welded joint. The maximum and minimum hardness values in the weld metal were 261 ± 9 and 239 ± 13 HV, corresponding to the center and capping passes, respectively, with an average hardness of 250 HV. The Charpy toughness test also indicated acceptable results, with an impact energy value of 176 ± 8.5 J. The study also provides a detailed discussion on the relationship between microstructure and mechanical properties, highlighting how microstructural features influence the mechanical performance of the welded joint.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mesoscopic damage behavior of recycled aggregate concrete modified with metakaolin under the combined effects of freeze–thaw cycles and sulfate attack","authors":"Weifeng Bai,&nbsp;Yue Geng,&nbsp;Chenyang Yuan,&nbsp;Junfeng Guan,&nbsp;Chaopeng Xie,&nbsp;Lielie Li","doi":"10.1007/s43452-024-01056-8","DOIUrl":"10.1007/s43452-024-01056-8","url":null,"abstract":"<div><p>The study investigated the damage evolution of recycled aggregate concrete (RAC) following various freeze–thaw cycles in a mass fraction of 5% sodium sulfate solution. Additionally, modified RAC specimens were created by partially substituting cement with metakaolin (MK) at substitution rates of 0% and 15%. The specimens were characterized using uniaxial compression testing, nuclear magnetic resonance (NMR) testing, scanning electron microscopy (SEM) testing, and X-ray diffraction (XRD) testing. The findings demonstrated that in the early cycles, physical damage caused by freeze–thaw primarily dominated, the limited amount of sulfate products filled the pores and generated a positive effect. In the later stages, the generation of numerous sulfate crystals and expansive substances like gypsum and ettringite were the primary factors contributing to the deterioration of specimen damage, increasing porosity and coarsening of pore size distribution. Furthermore, the inclusion of MK compacted the internal structure and alleviated the deterioration of RAC. Finally, based on statistical damage theory, it was believed that there were two damage modes at the mesoscopic: fracture and yield, and the failure mechanism of the specimens under freeze–thaw conditions was analyzed from the perspective of effective stress. By analyzing the evolution law of characteristic parameters, the connection between macro-, micro- and meso-cross-scales was constructed.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Laser welding on 10 mm thick grade 92 steel for USC applications: microstructure and mechanical properties","authors":"Dudekula Moulali,&nbsp;Amit Kumar,&nbsp;Krishna Guguloth,&nbsp;Sachin Sirohi,&nbsp;Chandra Shakher Tyagi,&nbsp;H. Natu,&nbsp;Chandan Pandey","doi":"10.1007/s43452-025-01144-3","DOIUrl":"10.1007/s43452-025-01144-3","url":null,"abstract":"<div><p>High-power lasers have been shown to be more effective for welding plates with thicknesses of 10 mm or greater. In the present research, a heat-resistant P92 steel plate was welded using the laser beam welding process. The laser-welded joint underwent mechanical testing and metallographic characterization in both the as-welded condition and after post-weld heat treatment (760 °C for 2 h). The macrostructure analysis revealed that the welded joint had full penetration with negligible internal defects. The widths of the heat-affected zone (HAZ), the weld metal at the top, and the weld metal in the root region were 1.77 mm, 3.83 mm, and 3.12 mm, respectively. Inhomogeneity in both the microstructure and microhardness was observed along the welded joint. The coarse-grained structure with negligible precipitates in the coarse-grained HAZ resulted in a maximum hardness of 432 HV, while a minimum hardness of 225 HV was measured in the inter-critical HAZ, likely due to the formation of a complex microstructure. Another important observation in the fine-grained HAZ and inter-critical HAZ was the presence of two types of grain boundaries: one decorated with a high density of precipitates and the other free from precipitates. This contributed significantly to the heterogeneity in the microstructure. The weld metal exhibited a lath-elongated martensitic microstructure, which showed significant hardness variation due to the presence of soft ferrite patches. The hardness of the untempered martensite in the weld metal ranged from 385 to 403 HV, with an average of 398 ± 7 HV. In contrast, the hardness of the soft ferrite patches was measured in the same range of 234–349 HV. The ultimate tensile strength and percentage elongation were 1014 ± 11 MPa and 27 ± 3%, respectively, which are significantly close to those of the P92 base metal, as fracture occurred in the P92 base metal. The Charpy toughness measured higher than the recommended value of 47 Joules, confirming the suitability of the welded joint for USC boiler applications. The PWHT significantly reduced the inhomogeneity in microstructure and mechanical properties, though some variation remained. There was a notable decrease in hardness for the weld metal, coarse-grained HAZ, and fine-grained HAZ after PWHT, while the hardness of the delta ferrite patches and inter-critical HAZ remained relatively unaffected, leading to continued microstructural heterogeneity. The tempering of martensite due to PWHT resulted in a drop in ultimate tensile strength and an increase in percentage elongation, with failure still occurring in the P92 base metal in the PWHT condition. Additionally, Charpy toughness increased significantly after PWHT, confirming the applicability of the PWHT for welded joints of P92 steel before final application. A good correlation between microstructure and mechanical properties was established based on these findings.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of the possibility of increasing the carburizing temperature of PYROWEAR 53 steel","authors":"T. Rygier,&nbsp;S. Jończyk,&nbsp;J. Szawłowski,&nbsp;P. Bilski,&nbsp;W. Goluch","doi":"10.1007/s43452-025-01139-0","DOIUrl":"10.1007/s43452-025-01139-0","url":null,"abstract":"<div><p>PYROWEAR 53 steel is a special carburizing steel used mainly for the production of machine parts for the aviation industry. Machine parts are surface-strengthened in the carburizing process and subsequent heat treatment (hardening, freezing, and low tempering). The carburizing temperature recommended and used in industrial practice is 921 °C. After saturating the surface layer with carbon, it is recommended to reheat for hardening and cooling in oil. This work assessed the possibility of increasing the carburizing temperature and hardening the layer immediately after saturating the surface layer with carbon, after cooling to the recommended hardening temperature of 913 °C. The carburizing process was carried out using the LPC (low-pressure carburizing) FineCarb technology. The condition for increasing the carburizing temperature was to maintain the required grain size of the prior austenite—G6. This study examined the tendency to grow the austenite grain and determined the highest austenitization temperature ensuring the required grain—G6. At this temperature, the carburizing process then heat treatment were carried out in accordance with the requirements of manufacturers of machine parts for the aviation industry. The microstructure of the layer, its phase composition, the content of retained austenite, the value of residual stresses and surface hardness, and its changes at depth were determined.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 2","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}