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Interfacial Microstructure and Mechanical Behavior of Low-Temperature Diffusion Bonded Mo/SS304 Joints Using Ni xCu 1-x Interlayers Ni xCu 1-x夹层Mo/SS304低温扩散连接接头的微观组织和力学行为
MatSciRN: Process & Device Modeling (Topic) Pub Date : 2022-01-01 DOI: 10.2139/ssrn.3834115
Ming-yong Jia, Fei Chen, Lei Zhang, Zhifeng Huang, Q. Shen
{"title":"Interfacial Microstructure and Mechanical Behavior of Low-Temperature Diffusion Bonded Mo/SS304 Joints Using Ni xCu 1-x Interlayers","authors":"Ming-yong Jia, Fei Chen, Lei Zhang, Zhifeng Huang, Q. Shen","doi":"10.2139/ssrn.3834115","DOIUrl":"https://doi.org/10.2139/ssrn.3834115","url":null,"abstract":"To join dissimilar metals with large differences in characteristics, such as molybdenum (Mo) and stainless steels (SS), is essential to take full advantage of their combined performances. In this work, Mo and SS304 have been jointed with Ni interlayer by using a diffusion bonding technique at different bonding temperatures. The results show that a MoNi brittle intermetallic compound is easy to form in the interface of the Mo/SS304 joint with increasing the bonding temperature, which will reduce the shear strength of the joint because a crack is easy to form between Mo and the intermetallic compounds. Meanwhile, Mo/SS304 joints have also been prepared by using Ni<sub>x</sub>Cu<sub>1-x</sub> (x=0.45, 0.24, or 0) as an interlayer. The result shows that reducing Ni content can avoid the formation of intermetallic compounds, and the fracture occurs between the interlayer and Mo diffusion zone far away from the Mo side. This work shows that the fracture properties of the Mo/SS304 joint can be modified by changing the composition of the interlayer. The best shear strength of the Mo/SS304 joint is 140 MPa. This work is important for providing an effective approach to join Mo and SS304 using a low-temperature diffusion bonding method.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90240213","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
An Improved Fault Current Calculation Method and Protection Scheme of Doubly-Fed Induction Generator 改进的双馈感应发电机故障电流计算方法及保护方案
MatSciRN: Process & Device Modeling (Topic) Pub Date : 2021-11-01 DOI: 10.2139/ssrn.3873132
Jun Yin
{"title":"An Improved Fault Current Calculation Method and Protection Scheme of Doubly-Fed Induction Generator","authors":"Jun Yin","doi":"10.2139/ssrn.3873132","DOIUrl":"https://doi.org/10.2139/ssrn.3873132","url":null,"abstract":"Abstract Existing research on Doubly fed Induction Generator (DFIG) short-circuit current studies are based on hypothesis the rotor current is zero when the Crowbar is input after the fault, which ignores the impact of rotor current attenuation process. It would bring the error to the calculation results. To solve this problem, on the basis of analyzing variation process of DFIG’s transient equivalent potential and the influence of rotor current attenuation process, the flux is calculated accurately. An accurate calculation equivalent model for DFIG short-circuit current is proposed. With the RTDS, an experiment platform with physical controller of converter is founded, the proposed model is validated. The effect of short circuit current to wind farms transmission line is studied, and an improved protection scheme is put forward.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85288841","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
A Dual-Tunable Ultra-Broadband Terahertz Absorber Based on Graphene and Strontium Titanate 基于石墨烯和钛酸锶的双可调谐超宽带太赫兹吸收体
MatSciRN: Process & Device Modeling (Topic) Pub Date : 2021-11-01 DOI: 10.2139/ssrn.3927081
Jiali Wu, Xin Yan, X. Yuan, Yang'an Zhang, Xia Zhang
{"title":"A Dual-Tunable Ultra-Broadband Terahertz Absorber Based on Graphene and Strontium Titanate","authors":"Jiali Wu, Xin Yan, X. Yuan, Yang'an Zhang, Xia Zhang","doi":"10.2139/ssrn.3927081","DOIUrl":"https://doi.org/10.2139/ssrn.3927081","url":null,"abstract":"An electrically and thermally dual-tunable broadband terahertz absorber based on graphene and strontium titanate is designed and analyzed. The results show that by lifting the Fermi energy of graphene, the absorption, particularly at higher frequencies, is significantly enhanced, resulting in a broader absorption bandwidth. By raising the temperature of strontium titanate, the center absorption frequency shifts to higher frequency and the bandwidth increases. At a Fermi energy of 1 eV and temperature of 400 K, the device exhibits an ultra-broad bandwidth of 3.36 THz and remarkable peak absorption exceeding 99%. Moreover, the absorber is insensitive to incident angles, maintaining a stable broad-bandwidth beyond 3.3 THz within a large incident angle of 55° and 50° for TE and TM polarizations, respectively. The physical mechanisms are elucidated by the impedance matching theory and electric field analyses. The structure shows great potential in tunable broadband terahertz absorbers and related applications.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87368430","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: 10
Hydrogen Concentration and Hydrides in Zircaloy-4 During Cyclic Thermomechanical Loading 循环热机械加载过程中锆合金-4中的氢浓度和氢化物
MatSciRN: Process & Device Modeling (Topic) Pub Date : 2021-10-01 DOI: 10.2139/ssrn.3828268
Yang Liu, Said El Chamaa, M. Wenman, C. Davies, F. Dunne
{"title":"Hydrogen Concentration and Hydrides in Zircaloy-4 During Cyclic Thermomechanical Loading","authors":"Yang Liu, Said El Chamaa, M. Wenman, C. Davies, F. Dunne","doi":"10.2139/ssrn.3828268","DOIUrl":"https://doi.org/10.2139/ssrn.3828268","url":null,"abstract":"Hydride formation in zircaloy-4 under cyclic thermomechanical loading has been investigated using characterized notched beam samples in four-point beam testing, and microstructurally-representative crystal plasticity modelling of the beam tests which incorporates an atomistically-informed thermodynamically-equilibrium model for hydrogen concentration. The model provided the locations within the microstructure of high hydrogen content, above that required for saturation, hence predicting the anticipated locations of hydride observations in the experiments. The strain rate sensitivity of this alloy over the temperature range considered led to considerable intragranular slip and corresponding stress redistribution, and cyclic strain ratcheting leading to high hydrostatic stresses and in turn hydrogen concentrations, which explains the locations of experimentally observed hydride formation. The interstitial hydrogen interaction energy as well as the intragranular geometrically necessary dislocation density were shown to be important in controlling the spatial distributions of observed hydrides.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79897502","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: 8
Flaw-Insensitive Fracture of a Micrometer-Sized Brittle Metallic Glass 微米级脆性金属玻璃的缺陷不敏感断裂
MatSciRN: Process & Device Modeling (Topic) Pub Date : 2021-10-01 DOI: 10.2139/ssrn.3848993
R. Qu, R. Maaß, Zengqian Liu, D. Tönnies, L. Tian, R. Ritchie, Zhefeng Zhang, C. Volkert
{"title":"Flaw-Insensitive Fracture of a Micrometer-Sized Brittle Metallic Glass","authors":"R. Qu, R. Maaß, Zengqian Liu, D. Tönnies, L. Tian, R. Ritchie, Zhefeng Zhang, C. Volkert","doi":"10.2139/ssrn.3848993","DOIUrl":"https://doi.org/10.2139/ssrn.3848993","url":null,"abstract":"Brittle materials, such as oxide glasses, are usually very sensitive to flaws, giving rise to a macroscopic fracture strength that is much lower than that predicted by theory. The same applies to metallic glasses (MGs), with the important difference that these glasses can exhibit certain plastic strain prior to catas- trophic failure. Here we consider the strongest metallic alloy known, a ternary Co 55 Ta 10 B 35 MG. We show that this macroscopically brittle glass is flaw-insensitive at the micrometer scale. This discovery emerges when testing pre-cracked specimens with self-similar geometries, where the fracture stress does not de- crease with increasing pre-crack size. The fracture toughness of this ultra-strong glassy alloy is further shown to increase with increasing sample size. Both these findings deviate from our classical under- standing of fracture mechanics, and are attributed to a transition from toughness-controlled to strength- controlled fracture below a critical sample size.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84246039","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: 18
Installation of Assembly Line in Most Economic Manner in Industry 以最经济的方式安装工业装配线
MatSciRN: Process & Device Modeling (Topic) Pub Date : 2021-08-25 DOI: 10.2139/ssrn.3911368
Kaushal Ahirwar
{"title":"Installation of Assembly Line in Most Economic Manner in Industry","authors":"Kaushal Ahirwar","doi":"10.2139/ssrn.3911368","DOIUrl":"https://doi.org/10.2139/ssrn.3911368","url":null,"abstract":"An assembly line is a production process that divides labour by breaking up the manufacture of a product into steps that are completed in a pre-defined sequence Assembly lines were used in the late 1800s when workers used pulley systems to move products from one station to the next Henry Ford created the first moving assembly line, combining Olds' idea with conveyor belts, to mass-produce the Model T in 1913. The modern assembly line is used in many different industries, increasing output, cutting down costs, and boosting profits.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76543626","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
Shading module with buckling as driver for shape morphing 着色模块与屈曲作为驱动形状变形
MatSciRN: Process & Device Modeling (Topic) Pub Date : 2021-07-07 DOI: 10.2139/ssrn.3881757
M. Khezri, K. Rasmussen
{"title":"Shading module with buckling as driver for shape morphing","authors":"M. Khezri, K. Rasmussen","doi":"10.2139/ssrn.3881757","DOIUrl":"https://doi.org/10.2139/ssrn.3881757","url":null,"abstract":"The recent requirements in construction for lower energy consumption have accelerated the trend towards the use of high performance buildings. In these Nearly Zero Energy Buildings (NZEB), simple measures such as natural light control are practiced for maximising the light intake and minimising the heat gain, as required. These modern building envelopes interact with the external environment and are designed to respond to occupant demand, achieving the target energy efficiency and comfort needs. In these kinetic façades, shape morphing triggered by buckling is targeted for energy-saving structural applications. Among the structural forms that are suitable for such applications are thin plates, which are prone to buckling under small in-plane strains. This study presents a novel concept with application in shading control modules. In the proposed models, buckling of slender plates are configured to create a bistable mechanism with closed and open states. The proposed mechanism is simulated using finite element software to validate the feasibility of the core concept and to evaluate buckling as a reliable mechanism in kinetic façade control modules.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91461416","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
Analysis of Cutting Forces During Grinding of Titanium Alloy and Corrosion-Resistant Steel by Diamond, Electrocorundum and Cubic Borine Nitrid Wheels 金刚石、电刚玉和立方硼氮轮磨削钛合金和耐蚀钢的切削力分析
MatSciRN: Process & Device Modeling (Topic) Pub Date : 2021-06-30 DOI: 10.15587/2706-5448.2021.235421
V. Lebedev, T. Chumachenko, A. Bespalova, T. Nikolaeva, Y. Omelchenko
{"title":"Analysis of Cutting Forces During Grinding of Titanium Alloy and Corrosion-Resistant Steel by Diamond, Electrocorundum and Cubic Borine Nitrid Wheels","authors":"V. Lebedev, T. Chumachenko, A. Bespalova, T. Nikolaeva, Y. Omelchenko","doi":"10.15587/2706-5448.2021.235421","DOIUrl":"https://doi.org/10.15587/2706-5448.2021.235421","url":null,"abstract":"The object of research is the process of circular and surface grinding of titanium alloy and corrosion-resistant steel, namely, the cutting forces arising from mechanical processing. One of the most problematic areas in work is the selection of the required grinding modes, material and grinding wheel grain size.<br><br>In the course of the experiment, we used samples of VT8 titanium alloy and 12Х18N9T steel, on which the grinding process was studied with wheels made of various materials (electrocorundum, cubic boron nitride (CBN), diamond). The values of the cutting forces Py and Pz were obtained in the latitude of permissible modes, which are most often used in circular and flat grinding, and can reach maximum values, respectively, Py=27 N, Pz=15.5 N. The data were obtained at a low wheel speed from electrocorundum, about 15 m/s and grain size 8. By reducing the grain size of the wheel, we get the effect of increasing the energy consumption of the grinding process, due to the increase in the values of the cutting forces. If we compare the cutting forces arising from grinding with different wheels, then the following can be noted. Compared to electrocorundum wheels, when using CBN wheels, the cutting forces are reduced by 20–25 %, and when grinding with diamond wheels (despite the high wear of the diamond wheel), the effect of cutting forces is reduced by 25–30 %. This is due to the fact that cutting conditions are the most favorable for diamond and CBN grains, which makes it possible to use more intense cutting conditions.<br><br>The results of the study allow predicting the performance of the grinding wheel, reducing the energy consumption of production, and also adjusting the processing mode of the part to obtain the necessary quality indicators of the surface layer and the geometric dimensions of the part.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75077993","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
A robust and efficient iterative strategy for nonlinear analysis of structures subjected to buckling 结构屈曲非线性分析的鲁棒高效迭代策略
MatSciRN: Process & Device Modeling (Topic) Pub Date : 2021-06-16 DOI: 10.2139/ssrn.3868245
D. Magisano, F. Liguori, L. Leonetti, G. Garcea
{"title":"A robust and efficient iterative strategy for nonlinear analysis of structures subjected to buckling","authors":"D. Magisano, F. Liguori, L. Leonetti, G. Garcea","doi":"10.2139/ssrn.3868245","DOIUrl":"https://doi.org/10.2139/ssrn.3868245","url":null,"abstract":"The paper shows how to make the incremental-iterative solution significantly more efficient and robust in geometrically non-linear structural problems discretized via displacement-based finite element formulations. The main idea is to relax the constitutive equations at each integration point (IP) during the iterations. The converged solution remains unchanged while the iteration matrix is computed using independent IP stresses. This reduces the number of iterations to obtain convergence and allows very large steps in incremental analyses. The computational cost of each iteration is the same as the original Newton method. Importantly, the robustness of the iterative process is unaffected by high membraneto-flexural stiffness ratios as opposite to the standard Newton method.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81381312","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
Alternative complementary shear and transversal elongation modes in Generalized Beam Theory (GBT) for thin‐walled circular cross‐sections 适用于薄壁圆形截面的广义梁理论(GBT)中的互补剪切和横向伸长模式
MatSciRN: Process & Device Modeling (Topic) Pub Date : 2021-06-16 DOI: 10.2139/ssrn.3868242
M. J. Bianco, A. Habtemariam, C. Könke, F. Tartaglione, V. Zabel
{"title":"Alternative complementary shear and transversal elongation modes in Generalized Beam Theory (GBT) for thin‐walled circular cross‐sections","authors":"M. J. Bianco, A. Habtemariam, C. Könke, F. Tartaglione, V. Zabel","doi":"10.2139/ssrn.3868242","DOIUrl":"https://doi.org/10.2139/ssrn.3868242","url":null,"abstract":"This paper presents alternative complementary shear and transversal elongation modes of Generalized Beam Theory (GBT) for thin-walled hollow circular cross-sections. It also compares them to the recent developments concerning membrane’s shear and transversal elongation. The main features of the alternative complementary modes are: i) despite of Poisson’s effect, each complementary mode is related to a clear membrane’s behavior: transversal elongation and shear deformation; ii) The coupling between these complementary modes is minimized, as well as the coupling between theses modes and the respective traditional GBT’s mode; iii) there is no coupling related to transversal stain energy either for membrane’s behavior, neither for plate’s behavior. To illustrate the presented alternative, complementary modes and its limitations, a detailed example applied in a short and deep pipe is carried out and its final results are compared not only with a full shell element model, but also with the recent developments in GBT.","PeriodicalId":18255,"journal":{"name":"MatSciRN: Process & Device Modeling (Topic)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80918955","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
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