Functional Composites and Structures最新文献_第8页

Low-velocity impact behavior of sandwich composite structure with 3D printed hexagonal honeycomb core: varying core materials 3D打印六边形蜂窝芯夹层复合材料结构的低速冲击性能:不同芯材

IF 2.8

Functional Composites and Structures Pub Date : 2022-08-29 DOI: 10.1088/2631-6331/ac8d7a

F. Nur Ainin, M. Azaman, M. A. Abdul Majid, M. Ridzuan

{"title":"Low-velocity impact behavior of sandwich composite structure with 3D printed hexagonal honeycomb core: varying core materials","authors":"F. Nur Ainin, M. Azaman, M. A. Abdul Majid, M. Ridzuan","doi":"10.1088/2631-6331/ac8d7a","DOIUrl":"https://doi.org/10.1088/2631-6331/ac8d7a","url":null,"abstract":"Additive manufacturing technology is extensively used in aeronautical applications, especially in designing the sandwich composite structures for repair tasks. However, the composite structures are vulnerable to impact loadings because of their exposure to, for instance, loading field carriages, flying debris, and bird strikes. This may lead to crack propagation and ultimately the structural failure. Therefore, it is important to investigate the mechanical behavior of sandwich composite structures under low-velocity impact. In this research, carbon fiber fabric reinforced 3D-printed thermoplastic composite of hexagonal honeycomb cores structures were fabricated with different unit cells (6, 8, and 10 mm) and varying materials (polylactic acid (PLA), PLA-Wood and PLA-Carbon). A drop weight impact test was performed under impact energies (5, 8, and 11 J) to determine the energy absorption performance of the structures whereas the surface morphology was analyzed using a high-intensity optical microscope. Comparing unit cells of materials used, it is observed that the unit cell of 8 mm is the best configuration for lightweight materials with impressive energy absorption capabilities. Under an impact energy of 11 J, the PLA-Wood of unit cell 8 mm shows 9.22 J higher in energy absorption than unit cell 10 mm which is 7.44 J due to intermediate stiffness that resists further deformation. While the filled PLA shows the PLA-Wood material offers better performance in energy absorption capability compared to PLA-Carbon. The PLA-Wood demonstrates 9.22 J more energy absorption for an unit cell 8 mm under an impact energy of 11 J than the PLA-Carbon, which is 8.49 J. This is due to the good compatibility between the hydroxyl groups of the polymer matrix and lignocellulose filler, which translates to better stiffness.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42156560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Self-powered triboelectric sensor for cooling fan monitoring 用于冷却风扇监测的自供电摩擦电传感器

IF 2.8

Functional Composites and Structures Pub Date : 2022-08-04 DOI: 10.1088/2631-6331/ac871b

Hak-Bong Kim, H. Hwang, Wook Kim, Seongchan Hong, Jong-Pil Yoon, Hye-Won Lim, D. Choi

{"title":"Self-powered triboelectric sensor for cooling fan monitoring","authors":"Hak-Bong Kim, H. Hwang, Wook Kim, Seongchan Hong, Jong-Pil Yoon, Hye-Won Lim, D. Choi","doi":"10.1088/2631-6331/ac871b","DOIUrl":"https://doi.org/10.1088/2631-6331/ac871b","url":null,"abstract":"Since the COVID-19 pandemic began, the use of computers, Internet of things devices, and artificial intelligence applications has dramatically increased. For the operation of these devices, it is important to effectively control the thermal management systems. Cooling fans play an important role in air circulation and thermal management for many types of industrial machines. In the past, a disassembly process has been inevitable for monitoring the operational status of cooling fans, making it necessary to develop devices or methods to monitor the operational status of cooling fans more conveniently. In this study, we propose a fan-shaped triboelectric sensor (F-TES) that can detect the operational status of a cooling fan via output signals of a triboelectric nanogenerator. We investigated the effects of rotational speed, as well as the working areas of the tribo-materials. Furthermore, we demonstrated those behaviors by using a light-emitting diode and capacitor charging. We designed an F-TES based on a commercial cooling fan without any structural changes, so that it could be directly utilized for various cooling fans. We anticipate that the results of this study can serve as a cornerstone for the maintenance and management of various commercial cooling fans.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47577433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strain measurements of an aircraft wing using embedded CNT fiber sensor and wireless SHM sensor node 基于嵌入式碳纳米管光纤传感器和无线SHM传感器节点的飞机机翼应变测量

IF 2.8

Functional Composites and Structures Pub Date : 2022-08-04 DOI: 10.1088/2631-6331/ac8719

Jinwoo Park, Jung‐Ryul Lee

{"title":"Strain measurements of an aircraft wing using embedded CNT fiber sensor and wireless SHM sensor node","authors":"Jinwoo Park, Jung‐Ryul Lee","doi":"10.1088/2631-6331/ac8719","DOIUrl":"https://doi.org/10.1088/2631-6331/ac8719","url":null,"abstract":"Composite material-based aircraft structures have attracted attention due to their lightweight and superior mechanical properties. However, composite structures have a high risk of structural failures when damages occur due to loadings or impacts. Therefore, consistent structural health monitoring (SHM) is needed to ensure the structural integrity and safety of the aircraft. Various methods of sensor installation and measurement systems were developed for the implementation of SHM in aircraft structures. In this research, the carbon nanotube (CNT) fiber sensor was optimized by comparing the different configurations such as carbon black concentration, polyurethane layer, and dip-coating iterations. Glass fiber reinforced plastic skin with embedded CNT fiber sensor was implemented on a 1700 mm long right main wing. Strain measurements were performed during static loadings through the wireless SHM sensor node. Strain measurement due to resistance change during temperature decrease was also performed to investigate the effect of temperature on the CNT fiber sensor. The CNT fiber sensor showed comparable strain measurement results to conventional strain gauge strain measurements. Consequently, the CNT fiber sensor and the wireless SHM sensor node showed new possibilities for embedded sensor applications and real-time SHM implementations for aircraft structures.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42061218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of porous cobalt oxide nanosheets: highly sensitive sensors for the detection of hydrazine 多孔氧化钴纳米片的合成:用于肼检测的高灵敏度传感器

IF 2.8

Functional Composites and Structures Pub Date : 2022-07-29 DOI: 10.1088/2631-6331/ac8595

Raj Kumar, A. Parkash, Sikander Almani, Muhammad Yousuf Jat Baloch, Rizwan Khan, S. A. Soomro

引用次数: 2

Integration of PCM as an external wall layer in reducing excessive heat of building walls 集成PCM作为外墙层，减少建筑墙体过热

IF 2.8

Functional Composites and Structures Pub Date : 2022-07-19 DOI: 10.1088/2631-6331/ac826b

Umi Nadiah Nor Ali, N. Mohamad Nor, N. Misnon, Siti Aminah Mohd Noor, Maidiana Othman, Muhammad Akmal Akif Alias, A. Syamsir

{"title":"Integration of PCM as an external wall layer in reducing excessive heat of building walls","authors":"Umi Nadiah Nor Ali, N. Mohamad Nor, N. Misnon, Siti Aminah Mohd Noor, Maidiana Othman, Muhammad Akmal Akif Alias, A. Syamsir","doi":"10.1088/2631-6331/ac826b","DOIUrl":"https://doi.org/10.1088/2631-6331/ac826b","url":null,"abstract":"Innovative building approaches, which take advantage of heat energy in buildings, have recently appeared as part of a global effort to save energy. Incorporating phase change material (PCM) into the building envelope helps in reducing energy consumption and regulating energy demand by managing the thermal inertia of designed PCM thermal characteristics. A study was conducted to assess the performance benefits provided by the latent heat of the concrete wall combined with PCM. This study focuses on developing and testing heat barrier performance by incorporating PCM into wall external finishing, i.e. cement plaster and gloss paint. The effect of PCM inclusion in building wall were investigated by experimental work. The results indicate that incorporating PCM into the building wall reduced the surface temperature by up to 9 °C. Furthermore, the application of the PCM in the plaster layer is more reliable in reducing the internal wall surface temperature by a value of 8.1 °C when compared to the PCM in a painted coating. Painted wall panels experienced more significant temperature reduction differences than other wall panels, i.e. 9.2 °C and 9.5 °C, respectively. However, painted wall panels experienced higher internal surface temperatures than external surface temperatures compared to plastered wall panel at night. This could be due to the paint reactions, which are ineffective at releasing internal heat from the building at night. The yearly energy demand is decreased by 64.3% by incorporating PCM to the building wall, with a total annual electricity bill savings of 42.3% (8695.8 kWh yr−1). Therefore, it was concluded that wrapped PCM integrated into plaster layers on external surface building walls could decrease the indoor building temperature and thus contribute to conserving the energy required for an air conditioning system.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44956941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Multi-parameter optimization (grey relational analysis) and modeling of a cellulosic plant/glass fiber hybrid reinforced polymer composite (P x G y E z ) for offshore pressure vessels development 用于海上压力容器开发的纤维素植物/玻璃纤维混杂增强聚合物复合材料（P x G y E z）的多参数优化（灰色关联分析）和建模

IF 2.8

Functional Composites and Structures Pub Date : 2022-07-02 DOI: 10.1088/2631-6331/ac7dd8

B. Samuel, M. Sumaila, B. Dan-asabe

{"title":"Multi-parameter optimization (grey relational analysis) and modeling of a cellulosic plant/glass fiber hybrid reinforced polymer composite (P x G y E z ) for offshore pressure vessels development","authors":"B. Samuel, M. Sumaila, B. Dan-asabe","doi":"10.1088/2631-6331/ac7dd8","DOIUrl":"https://doi.org/10.1088/2631-6331/ac7dd8","url":null,"abstract":"The aim of this research is to produce more environmentally friendly materials for offshore applications. Due to their high water absorption, cellulosic fibers are known to be hydrophilic, making composites reinforced with them perform poorly and unreliable in humid settings. Previous research has focused on the development of natural fiber-based composite materials, but none has focused on the optimization of these cellulosic-based fiber-reinforced composites for offshore applications where weight, water absorption, and strength are important considerations. This paper presents the optimization of the composite material P x G y E z (with x, y, and z representing the volume fraction of pineapple leaf fiber (PALF) (P), the volume fraction of glass fiber (G), and fiber length respectively in an epoxy matrix) using the grey relational analysis for offshore pressure vessels. The material at 10% PALF, 15% glass fiber, and 15 mm fiber length, which is, P10G15E15 was the optimum, having a grey relational grade of 0.716. Also, statistical analysis showed that the treated PALF fibers contributed 45.73% to the water absorption properties of the P x G y E z composites as compared to the 0.3% contribution of glass fiber to the grey relational grade and a 9.5% contribution of fiber length. Also, there was an improvement in the grey relational grade by 73.61%. SEM and Fourier-transform infrared spectroscopy (FTIR) analysis showed microstructural and chemical formations that explained the water absorption behavior of the optimized hybrid composite. Also, regression analysis was carried out and an equation was developed for the prediction of grey relational grades at different combinations of P x G y E z . A thick pressure vessel developed with the optimized material was simulated and results showed operational reliability with its yield starting at 30.01 MPa, which is 44.98% higher than the 20.7 MPa limit by the ASME X Class I cylinders.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46266429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Enhanced charge transport of conjugated polymer/reduced graphene oxide composite films by solvent vapor pre-treatment 溶剂蒸汽预处理增强共轭聚合物/还原氧化石墨烯复合膜的电荷输运

IF 2.8

Functional Composites and Structures Pub Date : 2022-04-08 DOI: 10.1088/2631-6331/ac65d7

Kyokunzire Proscovia, Hyeong Jun Cheon, Seo Young Shin, Ganghoon Jeong, S. Go, K. Kim, Rae-su Park, Y. Huh, Mincheol Chang

{"title":"Enhanced charge transport of conjugated polymer/reduced graphene oxide composite films by solvent vapor pre-treatment","authors":"Kyokunzire Proscovia, Hyeong Jun Cheon, Seo Young Shin, Ganghoon Jeong, S. Go, K. Kim, Rae-su Park, Y. Huh, Mincheol Chang","doi":"10.1088/2631-6331/ac65d7","DOIUrl":"https://doi.org/10.1088/2631-6331/ac65d7","url":null,"abstract":"In this study, a facile approach that could provide a significant enhancement of the charge transport properties of the conjugated polymer/reduced graphene oxide (rGO) composite films using a non-solvent vapor treatment is reported. As the methanol vapors were exposed to the poly(3-hexylthiophene) (P3HT)/rGO composite solution, P3HT chains self-assembled to create nanofibrillar structures via favorable π–π interactions. The π–π staking in P3HT occurred by the non-solvent vapor exposure to minimize unfavorable interactions of P3HT chains with the non-solvent vapor molecules. The self-assembly of P3HT chains was chiefly facilitated by the presence of rGO. This is because the surface of rGO can serve as nucleation sites for the growth of P3HT nanowires. Consequently, P3HT/rGO composite films obtained from the methanol vapor treated corresponding solutions exhibited a high charge carrier mobility (1.3 × 10−1 cm2 V−1 s−1), which is approximately 11-times and 6.5-times higher than those of pristine P3HT (1.2 × 10−2 cm2 V−1 s−1) and P3HT/rGO (2.0 × 10−2 cm2 V−1 s−1) composite films, respectively.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48626362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Fabrication methods of glass fibre composites—a review 玻璃纤维复合材料的制备方法综述

IF 2.8

Functional Composites and Structures Pub Date : 2022-04-04 DOI: 10.1088/2631-6331/ac6411

Taniya Kulhan, Arun Kamboj, N. Gupta, N. Somani

{"title":"Fabrication methods of glass fibre composites—a review","authors":"Taniya Kulhan, Arun Kamboj, N. Gupta, N. Somani","doi":"10.1088/2631-6331/ac6411","DOIUrl":"https://doi.org/10.1088/2631-6331/ac6411","url":null,"abstract":"The use of polymer composite has been implemented since 3400 B.C, the very first known composite’s application is attributed to the Mesopotamians. These ancient people fabricated plywood with glued wood strips placed at various distinct angles and in the late 1930s glass fiber thin strands have been developed. Glass fibre polymer composites have a wide scope in various engineering structures submarines, spacecraft, airplanes, automobiles, sports, and many more, over traditional materials because of their superior properties including lightweight, high fracture toughness, corrosion, fatigue, wear & fire resistance, high strength to weight ratio, high modulus and low coefficient of expansion. Various technologies have been developed so far to create different types of polymer composites in accordance with their properties and applications. Glass fiber possesses better properties as great strength, better flexibility, stiffness, and chemical corrosion resistance. Glass fibers are generally in the form of cut-up strand, fabrics and mats. Every kind of glass fibers has different properties and has various applications as in polymer composites. The aim of this review paper is to provide updated technological insights regarding the evolution of composite, classification of gass fibre polymer composites, development methodology in contrast with various applications, advantages and limitations and their behavioral properties.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45226378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Experimental investigation on abrasive water jet machining of neem wood plastic composite 磨料水射流加工印楝木塑复合材料的试验研究

IF 2.8

Functional Composites and Structures Pub Date : 2022-03-27 DOI: 10.1088/2631-6331/ac6152

S. Boopathi, A. Thillaivanan, M. Azeem, P. Shanmugam, V. Pramod

{"title":"Experimental investigation on abrasive water jet machining of neem wood plastic composite","authors":"S. Boopathi, A. Thillaivanan, M. Azeem, P. Shanmugam, V. Pramod","doi":"10.1088/2631-6331/ac6152","DOIUrl":"https://doi.org/10.1088/2631-6331/ac6152","url":null,"abstract":"In this article, the neem wood plastic composite material has been fabricated by mixing neem wood saw powder with polypropylene (PP) matrix by injection molding method to study the machining characteristics of the abrasive water jet machining process. The volume percentage of neem wood saw powder, the volume percentage of additive agent talc mixed with PP matrix (A), table traveling speed (Ts), and water-jet pressure (Wp) have been considered as process parameters. The experiments were conducted and analyzed to predict the optimum parameters setting for surface roughness (SR) and kerf angle (KA) using the Taguchi method. It was observed that KA and SR have been greatly impacted by the percentage of neem wood saw powder, table traveling speed, and water-jet pressure. The SR and KA were minimized by reducing the percentage of neem wood powder, table traveling speed, and water-jet pressure. The SR has been decreased by adding talc agent, conversely, the KA has been increased. The concurrent optimum process parameters setting to minimize both SR and KA had been estimated by the weighted product method (WPM). The predicted results from Taguchi and WPM had been verified by microscopic analysis and confirmation experiments.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44385734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Synergistic enhancement in electrical conductivity of polymer composites simultaneously filled with multi-walled carbon nanotube and pitch-based carbon fiber via one-step solvent-free fabrication 多壁碳纳米管和沥青基碳纤维同时填充聚合物复合材料的电导率协同增强

IF 2.8

Functional Composites and Structures Pub Date : 2022-03-13 DOI: 10.1088/2631-6331/ac5d26

H. Kang, Ki Hoon Kim, Geon Su Kim, Hyeseong Lee, Ji‐un Jang, S. Kim

{"title":"Synergistic enhancement in electrical conductivity of polymer composites simultaneously filled with multi-walled carbon nanotube and pitch-based carbon fiber via one-step solvent-free fabrication","authors":"H. Kang, Ki Hoon Kim, Geon Su Kim, Hyeseong Lee, Ji‐un Jang, S. Kim","doi":"10.1088/2631-6331/ac5d26","DOIUrl":"https://doi.org/10.1088/2631-6331/ac5d26","url":null,"abstract":"Recently, studies have been reported to synergistically improve the electrical conductivity of polymer composites by simultaneously incorporating hybrid fillers, but systematic studies on filler loading and ratio are still scarce. In this study, a one-step process was proposed to induce the incorporation of uniformly dispersed fillers with a high content, and synergistic improvement in the electrical conductivity of polymer composites was studied by applying two types of carbon fillers: nano-sized multi-walled carbon nanotube (MWCNT) and micro-sized pitch-based carbon fiber (PCF). Based on the proposed process, it was possible to fabricate a polymer composite in which the filler was uniformly dispersed within 40 wt%. The electrical conductivity of the composite containing up to 10 wt% MWCNT which was the percolation plateau content and 30 wt% PCF was 3940 S m−1, showing the maximum performance. This result was improved by 595% and 586%, respectively, compared to the electrical conductivity of the composite containing only 40 wt% MWCNT or PCF. These findings can contribute to expanding the application of conductive composites in the fields of antistatic or electromagnetic interference shielding by providing insight into the optimal design of hybrid filler systems to improve the electrical conductivity of composites.","PeriodicalId":12652,"journal":{"name":"Functional Composites and Structures","volume":" ","pages":""},"PeriodicalIF":2.8,"publicationDate":"2022-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41347695","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1