Advances in Industrial and Manufacturing Engineering最新文献_第5页

Modelling of wire-arc additive manufacturing – A review 电弧增材制造建模——综述

Advances in Industrial and Manufacturing Engineering Pub Date : 2023-05-01 DOI: 10.1016/j.aime.2023.100121

R.F.V. Sampaio , J.P.M. Pragana , I.M.F. Bragança , C.M.A. Silva , C.V. Nielsen , P.A.F. Martins

{"title":"Modelling of wire-arc additive manufacturing – A review","authors":"R.F.V. Sampaio , J.P.M. Pragana , I.M.F. Bragança , C.M.A. Silva , C.V. Nielsen , P.A.F. Martins","doi":"10.1016/j.aime.2023.100121","DOIUrl":"10.1016/j.aime.2023.100121","url":null,"abstract":"<div><p>This paper is focused on wire-arc additive manufacturing and has a twofold objective. First, to deliver an overall state-of-the-art review of the different aspects of modelling. Second, to provide a detailed analysis of the macro-scale finite element modelling. The methodology draws from the fundamentals of the macro, meso and micro-scale modelling of the process, to the main strategies and objectives behind the development of analytical, statistical, machine learning and finite element analyses of macro-scale modelling. The intention is to provide information on the pre-processing requirements, solution techniques and results that are currently being worked on by some of the leading researchers in the field. This will enable readers to understand the main challenges, relevance, and assumptions of the different published works. The theoretical and numerical aspects are intentionally kept in a clear and understandable level so that users of finite element computer programs having the know-how on wire-arc additive manufacturing can bridge the actual gap to the developers of the programs.</p></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41376916","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

Impact of additive manufacturing on titanium supply chain: Case of titanium alloys in automotive and aerospace industries 增材制造对钛供应链的影响:以汽车和航空航天行业的钛合金为例

Advances in Industrial and Manufacturing Engineering Pub Date : 2023-05-01 DOI: 10.1016/j.aime.2023.100112

Patricia Nyamekye , Saeed Rahimpour Golroudbary , Heidi Piili , Pasi Luukka , Andrzej Kraslawski

{"title":"Impact of additive manufacturing on titanium supply chain: Case of titanium alloys in automotive and aerospace industries","authors":"Patricia Nyamekye , Saeed Rahimpour Golroudbary , Heidi Piili , Pasi Luukka , Andrzej Kraslawski","doi":"10.1016/j.aime.2023.100112","DOIUrl":"https://doi.org/10.1016/j.aime.2023.100112","url":null,"abstract":"<div><p>Additive manufacturing (AM) is a promising technology for designing complex metallic pieces for different sectors with resource and time effectiveness. Titanium (Ti) is an essential critical material for AM development. AM can produce intricate and cost-effective components with Ti alloys for the transportation sector which would not be possible with conventional manufacturing (CM) technologies. This study assesses the impact of AM on the life cycle of Ti and its alloys by using review (numerical data, case examples) and dynamics simulation modelling. This article quantifies potential environmental benefits and examines aspects related to using Ti alloys in the automotive and aerospace industries. Mass flow, energy consumption and related greenhouse gas (GHG) emissions are assessed by making a comparison between subcategories of AM including binder jetting (BJT), directed energy deposition (DED), electron beam-based powder bed fusion (EB-PBF), and laser-based powder bed fusion (L-PBF) and CM processes including forging, milling, machining, and die casting. The results show that the AM subcategories considered potentially reduce manufacturing phase energy consumption and GHG emissions except for L-PBF. The findings highlight that an inclusive consideration of all life cycle phases is needed to fully identify potential benefits of AM for industries. Also, the scenario analysis in this study proposes the opportunity for saving mass and minimizing energy consumption and GHG emissions by optimizing the structural design and manufacturing processes for Ti components.</p></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49734266","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: 7

Melting modes of laser powder bed fusion (L-PBF) processed IN718 alloy: Prediction and experimental analysis 激光粉末床熔化（L-PBF）处理IN718合金的熔化模式预测与实验分析

Advances in Industrial and Manufacturing Engineering Pub Date : 2023-05-01 DOI: 10.1016/j.aime.2022.100106

S. Pramod, D. Kesavan

{"title":"Melting modes of laser powder bed fusion (L-PBF) processed IN718 alloy: Prediction and experimental analysis","authors":"S. Pramod, D. Kesavan","doi":"10.1016/j.aime.2022.100106","DOIUrl":"10.1016/j.aime.2022.100106","url":null,"abstract":"<div><p>The present study explores a combination of numerical and simulation approaches to generate a process map for identifying the regimes of conduction and keyhole modes of melting and verify the same with experimental data. Finite Element based simulation studies were conducted to determine the regions of conduction mode, keyhole mode, and transition by varying the laser power and speed. Single tracks and density cubes were processed based on the simulation results to confirm the melting modes and study its effect on microstructure and hardness. Increase in volumetric energy density (VED) causes a shift in microstructure of single tracks, from a mix of short columnar and equiaxed grains in conduction mode to long columnar grains in keyhole mode, with an overall increase in the grain size. The melt pool depth to width ratio also increases with VED. The VED based criteria alone cannot determine melting modes as the single-track samples at 81 J/mm<sup>3</sup> exhibited both conduction mode (at 250 W) and keyhole mode (at 350 W). Almost all the printed cubes showed high density (>99.9%) irrespective of melting mode. Similar to single track the average grain size of bulk samples increased with increase in VED. The bulk samples were subjected to three different heat treatments (Homogenisation, Solution treatment and Direct Double Aging) to study their effect on the microstructures and mechanical properties. Homogenisation resulted in near identical equiaxed microstructure irrespective of processing parameters. The highest hardness of about 470 HV was observed for the direct double aged samples.</p></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43340426","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

Evaluation of palm kernel oil as cutting lubricant in turning AISI 1039 steel using Taguchi-grey relational analysis optimization technique 应用田口灰关联分析优化评价棕榈仁油作为切削润滑油车削AISI 1039钢

Advances in Industrial and Manufacturing Engineering Pub Date : 2023-05-01 DOI: 10.1016/j.aime.2023.100115

E.S. Alaba , R.A. Kazeem , A.S. Adebayo , M.O. Petinrin , O.M. Ikumapayi , T.-C. Jen , E.T. Akinlabi

{"title":"Evaluation of palm kernel oil as cutting lubricant in turning AISI 1039 steel using Taguchi-grey relational analysis optimization technique","authors":"E.S. Alaba , R.A. Kazeem , A.S. Adebayo , M.O. Petinrin , O.M. Ikumapayi , T.-C. Jen , E.T. Akinlabi","doi":"10.1016/j.aime.2023.100115","DOIUrl":"10.1016/j.aime.2023.100115","url":null,"abstract":"<div><p>Cutting fluids have a known negative impact on productivity, human health, and the environment in the manufacturing sector. A suitable method for reducing the effect of cutting fluids on human health and the environment is minimum quantity lubrication (MQL). In this experiment, AISI 1039 steel was machined using vegetable oil lubricant and MQL. A chemical method was used to extract vegetable oil from palm kernel seeds. Then, using established techniques, the physicochemical and lubricity properties of palm kernel oil (PKO) were ascertained. The Taguchi L<sub>9</sub> (3<sup>3</sup>) orthogonal array served as the basis for the planning of the experimental design. Process parameters such as surface roughness, chip thickness ratio, cutting temperature, and material removal rate were measured during the turning operations. The multi-response outputs from TGRA were considered to simultaneously optimize the cutting parameters namely depth of cut, feed rate, and spindle speed. At a temperature of 55°C, 180 min, and particle sizes of 0.2–0.5 mm, an oil yield of 55% by weight was obtained. The viscosity at 40°C, specific gravity, pour, fire, cloud, and flash points of the raw PKO were 117.6 mm<sup>2</sup>/s, 0.8940 mg/ml, 21°C, 231°C, 22.3 <span><math><mrow><mo>°C</mo></mrow></math></span> and 227°C, respectively. The surface roughness and cutting temperature of PKO improved by 44% and 12%, respectively, when compared with mineral oil. The findings of this research confirmed the effectiveness of the integrated Taguchi-grey relational analysis (TGRA) optimization method and established an experimental foundation for the use of PKO minimum quantity lubrication turning.</p></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46284119","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

Numerical and experimental analysis of margin geometries of twist drills in deep hole machining operations 麻花钻深孔加工边缘几何形状的数值与实验分析

Advances in Industrial and Manufacturing Engineering Pub Date : 2023-05-01 DOI: 10.1016/j.aime.2023.100120

Christopher Krebs , Dennis Heyser , Bernhard Schweizer , Marcel Volz , Eberhard Abele , Matthias Weigold

引用次数: 0

Experimental investigation on surface topography in submerged abrasive waterjet cutting of Ti6Al4V 浸没磨料水射流切割Ti6Al4V表面形貌的实验研究

Advances in Industrial and Manufacturing Engineering Pub Date : 2023-05-01 DOI: 10.1016/j.aime.2023.100113

Paramjit Mahesh Thakur, Dadarao Niwrutti Raut

{"title":"Experimental investigation on surface topography in submerged abrasive waterjet cutting of Ti6Al4V","authors":"Paramjit Mahesh Thakur, Dadarao Niwrutti Raut","doi":"10.1016/j.aime.2023.100113","DOIUrl":"10.1016/j.aime.2023.100113","url":null,"abstract":"<div><p>Some of the key issues with AWJ technology are high roughness, low depth of smooth zone, and grit embedment. When compared to the unsubmerged AWJ, the submerged AWJ gives less divergence and produces higher energy at the cross section of the jet. Hence, this study examined the effects of pressure, traverse rate, and standoff distance on roughness, depth of smooth zone, and grit embedment in both AWJ conditions. Here, single factor experiments are conducted for experimental investigation wherein one factor is varied and the others are kept constant. In comparison, the submerged AWJ gave significant improvement in the roughness and depth of the smooth zone at lower levels of pressure (150 and 200 MPa), higher levels of traverse rate (300 and 350 mm/min) and standoff distance (4, 5 and 6 mm). The significant difference in grit embedment was observed at lower levels of traverse rate (150 and 200 mm/min), higher levels of pressure (300 and 350 MPa), and all the levels of standoff distance (2, 3, 4, 5, and 6 mm). The grit embedment in the submerged condition was lower due to the removal of initially embedded grits due to flushing action produced by cavitation initiation.</p></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45110732","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

A parametric study of the microstructural evolution of an advanced Ni-based superalloy powder when consolidated using Field Assisted Sintering Technology, compared to a hot isostatic pressing benchmark 采用场辅助烧结技术对一种高级镍基高温合金粉末进行固结，并与热等静压基准相比较，对其微观组织演变进行了参数化研究

Advances in Industrial and Manufacturing Engineering Pub Date : 2022-11-01 DOI: 10.1016/j.aime.2022.100103

K. Marshall , P. Schillinger , N.S. Weston , M. Epler , M. Jackson

{"title":"A parametric study of the microstructural evolution of an advanced Ni-based superalloy powder when consolidated using Field Assisted Sintering Technology, compared to a hot isostatic pressing benchmark","authors":"K. Marshall , P. Schillinger , N.S. Weston , M. Epler , M. Jackson","doi":"10.1016/j.aime.2022.100103","DOIUrl":"10.1016/j.aime.2022.100103","url":null,"abstract":"<div><p>The use of Field Assisted Sintering Technology (FAST) is examined for the consolidation of an advanced Ni-based superalloy powder feedstock. FAST processed material was directly compared to a benchmark material prepared via hot isostatic pressing (HIP) where it was found that density, hardness values and microstructures were comparable. FAST enables the retainment of the prior particle grain morphology when using sintering dwell times ranging from 10 to 240 min. The application of dwell temperatures above the γ′ solvus of the alloy resulted in significant grain growth. Measured densities reveal that the applied load and dwell time used during sintering have minimal effect on the final density of the consolidated material. The crystallographic texture was also shown to be isotropic in FAST consolidated material. This study demonstrates that FAST is potentially a viable complementary and/or alternative processing route for consolidating Ni-based superalloy powders.</p></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666912922000307/pdfft?md5=05f859ae414457581c7fb86c189d491a&pid=1-s2.0-S2666912922000307-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41383292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Transition between flow-drill screwing systems considering joining process and joint characteristics 考虑连接工艺和接头特性的流钻螺杆系统之间的过渡

Advances in Industrial and Manufacturing Engineering Pub Date : 2022-11-01 DOI: 10.1016/j.aime.2022.100091

Stephan Altvater, Sebastian P. Sikora, Tjark Siefkes

{"title":"Transition between flow-drill screwing systems considering joining process and joint characteristics","authors":"Stephan Altvater, Sebastian P. Sikora, Tjark Siefkes","doi":"10.1016/j.aime.2022.100091","DOIUrl":"10.1016/j.aime.2022.100091","url":null,"abstract":"<div><p>Flow-drill screwing is one of the key joining technologies for car body structures in multi-material lightweight design. In the course of technological developments and subsequent volume production of a product, different assets are used to obtain the same joints, assuming that similar processes yield the same joint characteristics. Since a simple transfer of the process parameters for joining the same materials is usually not possible, a remarkable experimental effort is required to meet manufacturing requirements. In this study the transition to an enhanced flow-drill screwing system and its effects on the joint is investigated. For this purpose, two flow-drill screwing systems typically used in the automotive industry are considered. An application-oriented approach for determining the joining parameters is shown. First, the optimal joining parameters for the target system were determined based on the process curves and parameters of the initial system by fulfilling the requirements for the joint. The joints were evaluated by using cross sections and single-lap shear tests. On this basis, the results of both flow-drill screwing systems were compared. Due to the further development of the flow-drill screwing system the process times can be significantly shortened while achieving the same mechanical properties and better process control at the same time.</p></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666912922000204/pdfft?md5=e401e7db8552d3322974b604b4220f61&pid=1-s2.0-S2666912922000204-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47384533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Adhesion dynamics under time-varying deposition: A study on robotic assisted extrusion 时变沉积下的粘附动力学:机器人辅助挤压的研究

Advances in Industrial and Manufacturing Engineering Pub Date : 2022-11-01 DOI: 10.1016/j.aime.2022.100101

Sean Psulkowski , Charissa Lucien , Helen Parker , Bryant Rodriguez , Dawn Yang , Tarik Dickens

{"title":"Adhesion dynamics under time-varying deposition: A study on robotic assisted extrusion","authors":"Sean Psulkowski , Charissa Lucien , Helen Parker , Bryant Rodriguez , Dawn Yang , Tarik Dickens","doi":"10.1016/j.aime.2022.100101","DOIUrl":"10.1016/j.aime.2022.100101","url":null,"abstract":"<div><p>Recent advances in robotic assisted-additive manufacturing (RA-AM) have enabled rapid material extrusion-based processing with comprehensive data collection. The following study investigates the adhesion dynamics of the initial printed layer across parameters such as surface energies, stand-off heights, and extrusion speeds of up to 100 mm/s, using an applied in-situ thermal analysis technique. Observations indicate that the characteristic length parameter, <span><math><mrow><msub><mi>L</mi><mi>c</mi></msub></mrow></math></span> < 0.05 mm, is adequate in anchoring the thermal melt, which adheres to the substrate when the nozzle proximity to the surface increases. Up to 100% molten area is contacting the surface prior to translation, and a final eccentricity over 0.85 has been observed. Through an analysis of variance, operational parameters of lower nozzle heights, printing speeds, and higher surface energy were statistically significant. The resultant in-situ characterization-driven data, was used to train a convolutional neural network (CNN). The model tested at an accuracy of 90.9%, and was able to distinguish between failed prints and initially adhered structures.</p></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666912922000289/pdfft?md5=f296766b745111821c00f7c1d543f9e4&pid=1-s2.0-S2666912922000289-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41776602","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dimensionality reduction to improve search time and memory footprint in content-retrieval tasks: Application to semiconductor inspection images 在内容检索任务中改进搜索时间和内存占用的降维方法:在半导体检测图像中的应用

Advances in Industrial and Manufacturing Engineering Pub Date : 2022-11-01 DOI: 10.1016/j.aime.2022.100097

Thomas Vial, Farah Dhouib, Louison Roger, Annabelle Blangero, Frédéric Duvivier, Karim Sayadi, Marisa N. Faraggi

{"title":"Dimensionality reduction to improve search time and memory footprint in content-retrieval tasks: Application to semiconductor inspection images","authors":"Thomas Vial, Farah Dhouib, Louison Roger, Annabelle Blangero, Frédéric Duvivier, Karim Sayadi, Marisa N. Faraggi","doi":"10.1016/j.aime.2022.100097","DOIUrl":"10.1016/j.aime.2022.100097","url":null,"abstract":"<div><p>Quality control in semiconductors is a crucial step to produce high quality microchips. During the last years, advances in artificial vision have significantly improved image quality control techniques. In the semiconductor industry, automated visual inspection is fundamental to avoid human intervention and keep the pipeline sanitized. Different types of images are collected during this process, feeding image databases that continually grow and cannot be labelled by humans in an exhaustive manner. Advances in image retrieval search methods are fundamental to develop more efficient techniques that meet user requirements.</p><p>In this work we propose a dimensionality reduction approach on the feature vectors computed by a classifying deep learning model, while keeping a high retrieval performance. To validate this technique, we evaluate four well-known reduction algorithms on a subset of the full database: Principal Component Analysis (PCA), Sparse Random Projection (SRP), Isomap, Locally Linear Embedding (LLE), in combination with three similarity metrics: Euclidian (<span><math><msub><mrow><mi>L</mi></mrow><mrow><mn>2</mn></mrow></msub></math></span>), cosine and inner product. As the number of components of the vectors is reduced, the performance of the image retrieval is measured by recall, time to search, and memory footprint of the database.</p><p>PCA offers the best results, allowing a significant reduction in search time and memory usage, while SRP becomes an option only when the cosine distance is used. With PCA, we were able to divide the memory footprint by a factor of 16, the search time by 6, while maintaining an average recall of 0.96.</p></div>","PeriodicalId":34573,"journal":{"name":"Advances in Industrial and Manufacturing Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666912922000241/pdfft?md5=8d1eb3351fc96b16fe2ebb5868cb4860&pid=1-s2.0-S2666912922000241-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44120760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0