Journal of Testing and Evaluation最新文献_第3页

Bond-Slip Model of Corrosion-Resistant Rebar and Fiber-Reinforced Seawater Sea-Sand Concrete 耐腐蚀钢筋与纤维增强海水海砂混凝土粘结滑移模型

4区材料科学

Journal of Testing and Evaluation Pub Date : 2023-10-20 DOI: 10.1520/jte20230256

Hao Zheng, Wei Wang, Chengqiang Gao, Jian Yuan, Jiang Feng

{"title":"Bond-Slip Model of Corrosion-Resistant Rebar and Fiber-Reinforced Seawater Sea-Sand Concrete","authors":"Hao Zheng, Wei Wang, Chengqiang Gao, Jian Yuan, Jiang Feng","doi":"10.1520/jte20230256","DOIUrl":"https://doi.org/10.1520/jte20230256","url":null,"abstract":"To study the bond performance between fiber-reinforced seawater sea-sand concrete and corrosion-resistant rebars (glass fiber–reinforced polymer [GFRP] bars and epoxy resin–coated rebars) in extremely hot and humid marine environments, bond anchorage tests between reinforcement and seawater sea-sand concrete are conducted to study bond performance. The failure morphology of reinforced concrete was investigated, and the bond-slip curves of different types of rebar and concrete were compared. According to the research results, the addition of basalt and polypropylene fibers to seawater sea-sand concrete changed the distribution of bonding stress, which was conducive to an improvement in the anchorage efficiency of reinforcement and concrete. The chemical bonding performance between the fiber-reinforced seawater sea-sand concrete and rebar is improved, wherein the bond stress increases by 94.01 % at the beginning of the slip, and the residual bond stress increases by 91.72 %. Compared with ordinary seawater sea-sand concrete, the bonding strength between ordinary reinforced rebar and fiber-reinforced seawater sea-sand concrete increased by 20.75 %, and the bonding strength between the GFRP bar and fiber-reinforced concrete decreased by 15.37 %. Based on the friction mechanism of rebars and concrete, bonding strength models of ordinary rebar, epoxy resin–coated rebar, and GFRP bars with fiber-reinforced seawater sea-sand concrete are presented.","PeriodicalId":17109,"journal":{"name":"Journal of Testing and Evaluation","volume":"6 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135513822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Overview on the Dispersion of Steel Fiber in Ultra-High-Performance Concrete 钢纤维在高性能混凝土中的分散研究进展

4区材料科学

Journal of Testing and Evaluation Pub Date : 2023-10-17 DOI: 10.1520/jte20230091

Enlai Dong, Dingqiang Fan, Xianwei Ma, Peibo You

{"title":"An Overview on the Dispersion of Steel Fiber in Ultra-High-Performance Concrete","authors":"Enlai Dong, Dingqiang Fan, Xianwei Ma, Peibo You","doi":"10.1520/jte20230091","DOIUrl":"https://doi.org/10.1520/jte20230091","url":null,"abstract":"Ultra-high-performance concrete (UHPC) is widely recognized for its high toughness, which is directly affected by the dispersion of steel fiber and its loading mode. To investigate the reinforcement effect of steel fiber, this paper summarizes the influencing factors, evaluation methods, and theoretical models of steel fiber dispersion in UHPC. First, the results reveal that a scientifically designed mixture can reduce the cost of steel fiber dosage in UHPC and improve fiber dispersion by adjusting matrix rheological properties. The optimum plastic viscosity of the slurry should range from 30 to 80 Pa·s for achieving the best fiber dispersion effect. Second, during slurry placement, the orientation of fibers in UHPC can be improved by up to 80 % through flow induction and the wall effect, which increases the bending strength, tensile strength, and toughness of UHPC matrix by 5–67 %, 30–90 %, and 13–200 %, respectively. Moreover, although the dispersion of fiber in two-dimensional space has been extensively studied, further characterization in three-dimensional space is required. Lastly, some theoretical simulation results have been achieved on fiber orientation, but factors such as aggregate or reinforcement must be considered.","PeriodicalId":17109,"journal":{"name":"Journal of Testing and Evaluation","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135944655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical Properties Analysis of Cylindrical Roller Bearings with Different Profiles under Combined Load 组合载荷作用下不同外形圆柱滚子轴承力学性能分析

4区材料科学

Journal of Testing and Evaluation Pub Date : 2023-10-17 DOI: 10.1520/jte20230230

Xilong Hu, Zihang Li, Lihua Yang, Yaoyu Han, Endian Xu, Chongyang Wang

{"title":"Mechanical Properties Analysis of Cylindrical Roller Bearings with Different Profiles under Combined Load","authors":"Xilong Hu, Zihang Li, Lihua Yang, Yaoyu Han, Endian Xu, Chongyang Wang","doi":"10.1520/jte20230230","DOIUrl":"https://doi.org/10.1520/jte20230230","url":null,"abstract":"Rolling bearing is one of the core basic components of the aero-engine, which mainly undertakes the role of supporting the rotor and the corresponding parts and transferring the load. Considering the rotating effect and important error sources such as axial predeformation and radial clearance that may occur during the installation of cylindrical roller bearings, this paper establishes a four-degree-of-freedom static analysis model of cylindrical roller bearings based on Hertzian elastic contact theory and conducts a comparative study on the mechanical characteristics of aero-cylindrical roller bearings with different profiles. The results show that as the radial load increases, the radial displacement and stiffness of the roller bearing will increase, whereas the fatigue life of the bearing will gradually decrease. Compared with the external load, the rotating speed has less influence on the stiffness of roller bearings. In addition, the profile of rolling elements as a basic structural parameter of the bearing will also have a greater impact on the mechanical properties of the roller bearings, which should be designed and used in conjunction with the actual situation in engineering applications.","PeriodicalId":17109,"journal":{"name":"Journal of Testing and Evaluation","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135944654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Testing and Evaluation of Buckling and Tensile Performance of Glass Fiber–Reinforced Polymer Angle Section with Different Joints/Connections 不同连接方式下玻璃纤维增强聚合物角截面屈曲和拉伸性能的测试与评价

4区材料科学

Journal of Testing and Evaluation Pub Date : 2023-10-13 DOI: 10.1520/jte20230010

Krishnasamy Ravikumar, Christian Johnson Singaram, Saravanakumar Palanichamy, Mohanraj Rajendran

引用次数: 0

Leaching Characteristics of Heavy Metals from Asphalt Mixture with Basic Oxygen Furnace Slag as Aggregate 碱性氧炉渣为集料沥青混合料中重金属的浸出特性

4区材料科学

Journal of Testing and Evaluation Pub Date : 2023-10-13 DOI: 10.1520/jte20230279

Yansong Fan, Meizhu Chen, Tianyuan Yang, Naiqiang Li, Xinyu Yao

{"title":"Leaching Characteristics of Heavy Metals from Asphalt Mixture with Basic Oxygen Furnace Slag as Aggregate","authors":"Yansong Fan, Meizhu Chen, Tianyuan Yang, Naiqiang Li, Xinyu Yao","doi":"10.1520/jte20230279","DOIUrl":"https://doi.org/10.1520/jte20230279","url":null,"abstract":"Basic oxygen furnace (BOF) slag, which has good mechanical properties, can be recycled as pavement materials. However, BOF slag contains several kinds of heavy metals. Batch leaching tests are usually conducted to investigate the leaching characteristics of asphalt mixture with BOF slag, which has a few limitations. In this article, the leaching characteristics of heavy metals were investigated through the column leaching test device self-designed in the laboratory. The factors that influence the leaching of heavy metals were evaluated. The experimental results indicate that high-basicity BOF slag that has high content of free calcium oxide (f-CaO) can effectively inhibit the leaching of heavy metals from asphalt mixture. Copper and nickel have no leaching risk in neutral and weakly acidic conditions. However, zinc and lead in asphalt mixture with medium-basicity BOF slag have a risk of causing environmental implication in long-term leaching process. Moreover, covering of asphalt inhibits the leaching of f-CaO and hinders the contact between heavy metals and the leachant at the same time. The conclusions of this article provide a theoretical basis for the green application of BOF slag as an asphalt pavement material.","PeriodicalId":17109,"journal":{"name":"Journal of Testing and Evaluation","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135805065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of Buckling Restraint on Axial Strain Life Fatigue Data 屈曲约束对轴向应变寿命疲劳数据的影响

4区材料科学

Journal of Testing and Evaluation Pub Date : 2023-10-11 DOI: 10.1520/jte20230366

Hongying Su, Yifei Gao, Xiao Liang, Yanpeng Lu, Chunqing Lin, Zheng Cao

{"title":"The Effect of Buckling Restraint on Axial Strain Life Fatigue Data","authors":"Hongying Su, Yifei Gao, Xiao Liang, Yanpeng Lu, Chunqing Lin, Zheng Cao","doi":"10.1520/jte20230366","DOIUrl":"https://doi.org/10.1520/jte20230366","url":null,"abstract":"Focused on the common problem of easy specimen buckling in the axial strain–controlled fatigue testing of thin automobile steel sheets, a strain fatigue test method for thicknesses less than 2.5 mm is proposed. Because of the unrestrained grip end of specimens between the anti-buckling device and the testing machine fixture, specimens were prone to buckling in this area. In addition, if the designed specimen sizes were unreasonable, buckling may have occurred in the width and thickness directions of the gauge length of the specimen. Both situations can lead to invalid tests. This paper adopted a testing machine fixture and an anti-buckling plate as a mortise-and-tenon structure for the anti-buckling method; the upper and lower fixtures of the testing machine were cut in straight grooves, and the left and right anti-buckling plates were designed to be connected with a mortise and tenon. This is equivalent to narrowing the width of the unrestrained part of the specimen’s grip end to avoid buckling failure due to plane strain. The factors affecting the stiffness of fatigue specimens are also discussed herein. In order to avoid common instability in the thickness and width directions of the gauge length and unconstrained part of the specimen’s grip end at a strain ratio of Re = −1 during testing, six recommended specimen sizes are given on the premise of ensuring maximum specimen stiffness. When using the anti-buckling device, the recommended specimen sizes and test points of this study (i.e., the lower limits for yield strength and thickness of strain control testing) are 110 MPa and 0.5 mm, respectively, with which continuous and smooth stress–strain curves that result in accurate and reliable experimental data can be obtained.","PeriodicalId":17109,"journal":{"name":"Journal of Testing and Evaluation","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136057655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a Creep Mechanical Frame Setting Based on Arcan Test 基于Arcan试验的蠕变机械框架设置方法的开发

4区材料科学

Journal of Testing and Evaluation Pub Date : 2023-10-09 DOI: 10.1520/jte20230225

Marthe Loiseau, Sylvain Chataigner, Romain Créac’hcadec, Emilie Lepretre, Jean-Philippe Court, Marie-Odette Quéméré

{"title":"Development of a Creep Mechanical Frame Setting Based on Arcan Test","authors":"Marthe Loiseau, Sylvain Chataigner, Romain Créac’hcadec, Emilie Lepretre, Jean-Philippe Court, Marie-Odette Quéméré","doi":"10.1520/jte20230225","DOIUrl":"https://doi.org/10.1520/jte20230225","url":null,"abstract":"Structural adhesive bonding has several advantages compared to other assembly techniques such as welding and riveting. Yet, creep is an important long-term phenomenon that needs to be considered for the design of such joints. To investigate this aspect, experimental investigations are needed at the scale of the adhesive layer. At such a scale, Arcan setting presents several advantages compared to other existing tests (analysis of different loads, limited edge effects) and was thus chosen for the development of an experimental approach aiming at providing creep characterization of adhesive layers. A mechanically operated testing machine was thus developed and is presented herein. To measure local strains of the adhesive layer, two linear variable differential transformer sensors are fixed on a support placed on the beaks of the Arcan sample according to two directions: normal and tangential to the bonded surface. The developed system (mechanical system and strain measurement) proved to be successful in investigating the creep behavior of adhesive layers while varying several parameters (load levels, type of load, temperature, adhesive thickness).","PeriodicalId":17109,"journal":{"name":"Journal of Testing and Evaluation","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135044123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Image Processing Algorithm Design of Agricultural Internet of Things Platform Based on Big Data Analysis 基于大数据分析的农业物联网平台图像处理算法设计

4区材料科学

Journal of Testing and Evaluation Pub Date : 2023-10-04 DOI: 10.1520/jte20230040

Han Sun

引用次数: 0

Formation of Bentonite Filter Cake over Crystalline Metamorphic Rocks by Means of a Pressure Chamber: A Laboratory Study 压力室法在结晶变质岩上形成膨润土滤饼的实验研究

4区材料科学

Journal of Testing and Evaluation Pub Date : 2023-10-02 DOI: 10.1520/jte20220322

Ayodya Udara Veediya Bandara Bulathsinhala, Udeni Gnanapriya Anuruddha Puswewala

引用次数: 0

Testing and Evaluation of the Spark Erosion Parameter for Machining Intermetallic Ceramic Composite for Enhancing Drilled Hole Accuracy 提高钻孔精度加工金属间陶瓷复合材料火花侵蚀参数的测试与评价

4区材料科学

Journal of Testing and Evaluation Pub Date : 2023-10-02 DOI: 10.1520/jte20220685

L. Selvarajan, R. Rajavel, Anish Nair, M. Chandrasekaran

引用次数: 0