Curved and Layered Structures最新文献_第5页

Determination of the dynamic performance of natural viscoelastic composites with different proportions of reinforcing fibers 不同比例增强纤维天然粘弹性复合材料动态性能的测定

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0011

S. Shlykov, R. Rogulin, S. Kondrashev

{"title":"Determination of the dynamic performance of natural viscoelastic composites with different proportions of reinforcing fibers","authors":"S. Shlykov, R. Rogulin, S. Kondrashev","doi":"10.1515/cls-2022-0011","DOIUrl":"https://doi.org/10.1515/cls-2022-0011","url":null,"abstract":"Abstract Viscoelastic composites are strong and handle vibration damping quite well, which allows them to be used in a wide variety of applications. Thus, there is a need to determine the optimal amount of fiber to ensure high mechanical and dynamic performance with as little interference as possible. The purpose of this work is to find the most appropriate percentage of organic fiber – cellulose derived from corn stalks in a polylactic acid matrix, studying the changes in damping characteristics, tensile strength, bend-test. As parameters for comparison, the coefficient of bending and breaking strength, modules of accumulation and losses, factor C were chosen. It was found that strength indicators decrease with fiber fraction growth. While the damping factor at the glass transition temperature increases. In order to confirm the results obtained, the calculation of the C factor was used. The study investigates the damping factor’s dependence on the mechanical properties. It is shown that there is a correlation between moduli and bending strength with increasing fiber fraction. The scientific novelty of this work is the study of natural viscoelastic composites with different proportions of reinforcing fibers based on mechanical and dynamic characteristics in order to create and apply biodegradable viscoelastic composites in various fields.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"116 - 123"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44019733","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

CFD Comparison of multiphase models in the pool boiling state 池沸腾状态多相模型的CFD比较

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0029

Suleiman MJ. Enjadat

{"title":"CFD Comparison of multiphase models in the pool boiling state","authors":"Suleiman MJ. Enjadat","doi":"10.1515/cls-2022-0029","DOIUrl":"https://doi.org/10.1515/cls-2022-0029","url":null,"abstract":"Abstract With the development of simulation technology and programs, it became necessary to study the models that control equations’ solutions and influence the results. The models having control over solving equations of multiple phases and materials are investigated. They include (Volume of Fluid (VOF), mixture, Eulerian) controlling the governing equations. The study was conducted depending on the boiling point of the water. The activation of these three models is carried out to find out which one is better for solving the issue of boiling compared to previous numerical and empirical research with the study of the surface tension coefficient that affects the behavior of phases in a contaminated manner. The best model explored in the case of boiling is VOF for the merging of steam bubbles, the velocity of flows 0.257 m/s for both water and steam, and the phase transition. The effectiveness of the VOF model is mirrored by higher efficiency and accuracy of the solution with velocity 0.257 m/s and volume fraction 0.9997. The activation of the surface tension factor 0.072 property simulates the real conditions surrounding the materials used in boiling, but it significantly increases the turbulence and distribution of gas bubbles.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"382 - 389"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42719445","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

Generate high data rate of optical carries by using nanomaterial graphene in slab waveguide 利用纳米材料石墨烯在平板波导中产生高数据速率的光载波

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0015

Saib Thiab Alwan, O. A. Mahmood, Tahreer Mahmood

{"title":"Generate high data rate of optical carries by using nanomaterial graphene in slab waveguide","authors":"Saib Thiab Alwan, O. A. Mahmood, Tahreer Mahmood","doi":"10.1515/cls-2022-0015","DOIUrl":"https://doi.org/10.1515/cls-2022-0015","url":null,"abstract":"Abstract Single mode is one of the most practical applications in microwave propagations because of its high mode resolution and low transmission loss. In this paper, the single mode graphene material was implemented in slab waveguide to study the performance and optical properties of graphene material; the parameters that affect these models were found to be the cut-off frequency, attenuation wavenumbers, modes numbers, skin depth, angles incident, and propagation wave numbers. The effectiveness of these factors was simulated and analyzed using MATLAB software program. In this paper, the carriers were generated using nano-graphene; the optical carrier source provided seven carriers with the frequency spacing of 4.9682 GHz. After splitting the carriers using optical demultiplexer, these carriers were modulated independently using optical Quadrature phase shift keying (QPSK) modulators at symbol rate equal to 4.9682 Gsymbol/s; this matches the frequency spacing of the carriers. Under this argument, the total data rate was equal to 2*7*4.9682 Gsymbol/s = 69.5548 Gbit/s, and the total bandwidth was 34.774 GHz. These carriers were found to work in optical communication with high data rate.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"187 - 192"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47655627","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

Mixed convection around a circular cylinder in a buoyancy-assisting flow 浮力辅助流中圆柱体周围的混合对流

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0008

H. S. Majdi, M. Mashkour, L. Habeeb, M. Ilic

{"title":"Mixed convection around a circular cylinder in a buoyancy-assisting flow","authors":"H. S. Majdi, M. Mashkour, L. Habeeb, M. Ilic","doi":"10.1515/cls-2022-0008","DOIUrl":"https://doi.org/10.1515/cls-2022-0008","url":null,"abstract":"Abstract In this paper, the effect of mixed convection on the flow behavior and heat transfer around a circular cylinder disclosed to a vertically upward laminar air stream is numerically examine. The buoyancy-aided flow is utilized to eliminate and control the vortex shedding of the cylinder. The influence of the Grashof number, 0 ≤ Gr ≤ 6000, the flow and thermal patterns, as well as the local and mean Nusselt number, is investigated at a constant Reynolds number of 100. The unsteady Navier-Stokes’s equations are solved employing a finite-volume method to simulate numerically the velocity and temperature fields in time and space. The results showed periodic instability in the flow and thermal fields for a range of Grashof number Gr ≤ 1300. Also, there is critical value of Grashof number for stopping this instability and the vortex shedding formed behind the cylinder, by the effect of heating. Thus, by increasing Grashof number between 1400 ≤ Gr ≤ 4000, the periodic flow vanishes and converts into steady flow with twin eddies attached to the cylinder from the back. Furthermore, as Grashof number increases behind Gr ≥ 5000, the flow becomes completely attached to the cylinder surface without any separation.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"81 - 95"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47982765","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

Viscoelastic behavior of glass fiber reinforced rubber-modified epoxy 玻璃纤维增强橡胶改性环氧树脂的粘弹性行为

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0030

Adnan Abbass Al-Azzawi

引用次数: 0

Three-dimensional numerical study of the reactive powder concrete segments in tunnel lining 隧道衬砌中活性粉末混凝土管片的三维数值研究

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0022

Hajer Satih Abbas, Maadh Imad Salman Al-Rubaye, Sarra’a Dhiya’a Jaafer, Bassam farman bassam, Abdelmajeed Alkasassbeh

{"title":"Three-dimensional numerical study of the reactive powder concrete segments in tunnel lining","authors":"Hajer Satih Abbas, Maadh Imad Salman Al-Rubaye, Sarra’a Dhiya’a Jaafer, Bassam farman bassam, Abdelmajeed Alkasassbeh","doi":"10.1515/cls-2022-0022","DOIUrl":"https://doi.org/10.1515/cls-2022-0022","url":null,"abstract":"Abstract The tunnel lining systems act as lines of defence against the forces and geotechnical situations. The use of precast concrete tunnel linings (PCTLs) has been escalating due to its effective and economical installation process. The tunnels usually suffer from the premature deterioration due to corrosion of the reinforcement and thus need maintenance. Corrosion leads to the distress in PCTL leading to the cracking and finally the scaling of concrete. This study aims to assess the structural durability performance of reactive powder concrete (RPC) as the material of tunnel lining segments compared to reinforced concrete (RC) and high performance concrete (HPC). The numerical findings indicated that the maximum load capacity of PRC-PCTL segments was greater than that of the corresponding RC and HPC segments. Regarding the findings, PRC is a very significant option for conventional segments. The high strength of PRC can decrease the thickness of the PCTL segments, resulting in the decreased material cost. Also, PRC-PCTL segments can eliminate the laborious and costly production of RC segments and mitigate the corrosion damage and thus enhance the service life of lining segments.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"286 - 294"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41675245","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

Calculation method of stability bearing capacity of transmission tower angle steel considering semi-rigid constraint 考虑半刚性约束的输电塔角钢稳定承载力计算方法

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0017

Feng Qiu, J. Qiu, Heng Feng, Huajie Wang, H. Qian, Xiao-fei Jin, Kai-ming Wang, F. Fan

{"title":"Calculation method of stability bearing capacity of transmission tower angle steel considering semi-rigid constraint","authors":"Feng Qiu, J. Qiu, Heng Feng, Huajie Wang, H. Qian, Xiao-fei Jin, Kai-ming Wang, F. Fan","doi":"10.1515/cls-2022-0017","DOIUrl":"https://doi.org/10.1515/cls-2022-0017","url":null,"abstract":"Abstract The angle steel member is the most commonly used component form of the transmission tower structure. Considering its connection characteristics, we must deal with its stability analysis under semi-rigid constraint conditions for the proper study of the overall structure’s mechanical performance. Therefore, in order to establish a simple and high-precision method suitable for the ultimate bearing capacity analysis of the transmission tower, we build the refined finite element models of typical steel tower joints, analyze its moment-rotation curve and utilize simulation technique of spring elements to acquire the calculation method of its single angle stability bearing capacity, which is considering initial imperfection and residual stress. Furthermore, we analyze its bearing capacity under different constraint conditions such as rigid, semi-rigid and articulated connection. The results show that it is necessary to consider joint stiffness in the bearing capacity analyses. Finally, it’s confirmed that the calculation results of this method agree well with the experimental data, which validates its high accuracy. Therefore, the method provides technical support for high efficient component stability simulation in overall stability analyses of the transmission steel tower.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"202 - 211"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43741459","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

Optimization of fatigue life in laminated composite plates 复合材料层合板疲劳寿命的优化

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0183

B. Ahmed

引用次数: 0

A quadrilateral flat-shell element for the static and dynamic analysis of composite and sandwich cylindrical, spherical and conical shell panels 复合材料和夹层圆柱、球面和圆锥壳板静动力分析的四边形扁壳单元

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0025

V. Dagade, Shripad Kulkarni

{"title":"A quadrilateral flat-shell element for the static and dynamic analysis of composite and sandwich cylindrical, spherical and conical shell panels","authors":"V. Dagade, Shripad Kulkarni","doi":"10.1515/cls-2022-0025","DOIUrl":"https://doi.org/10.1515/cls-2022-0025","url":null,"abstract":"Abstract A quadrilateral flat-shell element is developed for analysing the deflections, stresses and natural frequencies along with their allied mode shapes of cylindrical, spherical, and conical shell panels made up of layered composite and sandwich material. The developed element (DKZigTS1) is based on zigzag theory and has seven local as well as global DOF per node. The concept of obtaining transformation matrix is used for transforming actions and reactions from local to global direction to convert the plate bending into a flat-shell element. The two separate coordinate systems are used to transform rotational and translational degrees-of-freedom (DOF), from local to global direction. The local translational DOF are transformed to global Cartesian coordinates (x, y, z) and the local rotational DOF are transformed to the surface coordinate system (ξ1, ξ2, ξ3), in which ξ3 is perpendicular to the surface. The DKZigTS1 element gives fairly accurate results that align with the 2D analytical and the 3D elasticity solutions, reported in the literature for moderately thick and thick shell panel. The present results are also in good agreement with the 3D finite element solutions for shallow and deep shell panels having various material properties, boundary restrained environments, and geometrical shapes considered in this study.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"320 - 344"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42007359","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

Assessment of ship structure under fatigue loading: FE benchmarking and extended performance analysis 疲劳载荷下船舶结构的评估：有限元基准和扩展性能分析

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0014

Aprianur Fajri, A. Prabowo, N. Muhayat

引用次数: 10