Curved and Layered Structures最新文献_第4页

Strength analysis of marine biaxial warp-knitted glass fabrics as composite laminations for ship material 船用双轴经编玻璃织物复合层合材料的强度分析

IF 1.5

Curved and Layered Structures Pub Date : 2023-01-01 DOI: 10.1515/cls-2022-0209

B. Ma’ruf, A. Ismail, Dian Purnama Sari, S. H. Sujiatanti

{"title":"Strength analysis of marine biaxial warp-knitted glass fabrics as composite laminations for ship material","authors":"B. Ma’ruf, A. Ismail, Dian Purnama Sari, S. H. Sujiatanti","doi":"10.1515/cls-2022-0209","DOIUrl":"https://doi.org/10.1515/cls-2022-0209","url":null,"abstract":"Abstract Fiberglass-reinforced plastics (FRP) composite materials for ships that are widely used are marine-grade unsaturated polyester resin matrix and combimat fiber, a combination of marine-grade chopped strand mat (CSM) and woven roving (WR) fibers. Although less popular than marine CSM–WR, marine biaxial warp-knitted glass fabrics have the potential to be applied as fiber laminates for ship hull materials. A comparative study of tensile and bending strength between marine CSM–WR composite and marine CSM–biaxial composite had been conducted. All composites met the criteria of the Indonesian Classification Bureau. Specifically, the CSM–biaxial had higher tensile and flexural strength with fewer laminations than the CSM–WR. Laminate type II had the highest average normalized tensile and flexural strength, 186.1 and 319.2 MPa. A layer of biaxial fiberglass had a very significant effect on tensile and flexural strength. Besides its strength, fewer type II laminations can speed up the production process of FRP ship hulls. Furthermore, the CSM–biaxial composite had relatively high normalized flexural strength compared to other references. However, the normalized tensile strength achieved in this study was at an intermediate level compared to other references.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43181768","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

Experimental measurement and numerical predictions of thickness variation and transverse stresses in a concrete ring 混凝土环中厚度变化和横向应力的实验测量和数值预测

IF 1.5

Curved and Layered Structures Pub Date : 2023-01-01 DOI: 10.1515/cls-2022-0180

Djopkop Kouanang Landry, Bodol Momha Merlin, Amba Jean Chills, Nkongho Anyi Joseph, Fongho Eric, Zoa Ambassa, Nzengwa Robert

引用次数: 1

Laminar Rayleigh–Benard convection in a closed square field with meshless radial basis function method 用无网格径向基函数法求解封闭正方形场中的层流Rayleigh–Benard对流

IF 1.5

Curved and Layered Structures Pub Date : 2023-01-01 DOI: 10.1515/cls-2022-0204

I. Santosa, E. P. Budiana, Syamsul Hadi, A. Wijayanta

引用次数: 0

Numerical investigations of two vibrating cylinders in uniform flow using overset mesh 均匀流中两个振动圆柱的超集网格数值研究

IF 1.5

Curved and Layered Structures Pub Date : 2023-01-01 DOI: 10.1515/cls-2022-0208

F. O. Hamdoon, Enass H. Flaieh, Alaa Abdulhady Jaber

{"title":"Numerical investigations of two vibrating cylinders in uniform flow using overset mesh","authors":"F. O. Hamdoon, Enass H. Flaieh, Alaa Abdulhady Jaber","doi":"10.1515/cls-2022-0208","DOIUrl":"https://doi.org/10.1515/cls-2022-0208","url":null,"abstract":"Abstract In this research, flow around two vibrating cylinders in a tandem arrangement is simulated at Reynolds number Re = 200 using the dynamic overset mesh technique in finite volume-based commercial software. This investigation aims to study the combined influences of the spacing between the two identical circular cylinders and their excitation frequency in the flow. The cylinders are excited by a transverse forced vibration in a uniform cross-flow by applying a simple harmonic motion. The gap distance between the vibrating cylinders is chosen to be L/D = 1.5 and 4, and the vibration amplitude is kept constant at A/D = 0.25. The study focuses on three frequency ratios of the cylinders’ excitation frequency to Strouhal shedding frequency of the single stationary cylinder f e/f s = 0.8, 1.0, and 1.2. Simulation results showed that the flow characteristics over the two vibrating circular cylinders differ from that of a single vibrating cylinder. Also, it is observed that the lock-in state (resonance) for the two vibrating cylinders and the vortex wake patterns are highly affected by the gap distance between cylinders and the excitation frequency.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47685132","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

In-plane nonlinear postbuckling and buckling analysis of Lee’s frame using absolute nodal coordinate formulation 李氏框架平面内非线性后屈曲及屈曲的绝对节点坐标分析

IF 1.5

Curved and Layered Structures Pub Date : 2023-01-01 DOI: 10.1515/cls-2022-0212

Abdur Rahman Shaukat, Peng Lan, Jia Wang, Tengfei Wang, Nianli Lu

{"title":"In-plane nonlinear postbuckling and buckling analysis of Lee’s frame using absolute nodal coordinate formulation","authors":"Abdur Rahman Shaukat, Peng Lan, Jia Wang, Tengfei Wang, Nianli Lu","doi":"10.1515/cls-2022-0212","DOIUrl":"https://doi.org/10.1515/cls-2022-0212","url":null,"abstract":"Abstract In this study, four absolute nodal coordinate formulation (ANCF)-based approaches are utilized in order to predict the buckling load of Lee’s frame under concentrated load. The first approach employs the standard two-dimensional shear deformable ANCF beam element based on the general continuum mechanics (GCM). The second approach adopts the standard ANCF beam element modified by the locking alleviation technique known as the strain-split method. The third approach has the standard ANCF beam element with strain energy modified by the enhanced continuum mechanics formulation. The fourth approach utilizes the higher-order ANCF beam element based on the GCM. Two buckling load estimation methods are used, i.e., by tracing the nonlinear equilibrium path of the load–displacement space using the arc-length method and applying the energy criterion, which requires tracking eigenvalues through the dichotomy scheme. Lee’s frame with different boundary conditions including pinned–pinned, fixed-pinned, pinned-fixed, and fixed–fixed are studied. The complex nonlinear responses in the form of snap-through, snap-back, and looping phenomena during nonlinear postbuckling analysis are simulated. The critical buckling loads and buckling mode shapes obtained through the energy criterion-based buckling method are obtained. After the comparison, higher-order beam element is found to be more accurate, stable, and consistent among the studied approaches.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47920789","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

Nonlocal state-space strain gradient wave propagation of magneto thermo piezoelectric functionally graded nanobeam 磁热压电功能梯度纳米梁的非局域状态空间应变梯度波传播

IF 1.5

Curved and Layered Structures Pub Date : 2023-01-01 DOI: 10.1515/cls-2022-0192

R. Selvamani, Rubine Loganathan, R. Dimitri, Francesco Tornabene

引用次数: 2

A methodological approach for detecting multiple faults in wind turbine blades based on vibration signals and machine learning 一种基于振动信号和机器学习的风电叶片多故障检测方法

Curved and Layered Structures Pub Date : 2023-01-01 DOI: 10.1515/cls-2022-0214

Ahmed Ali Farhan Ogaili, Alaa Abdulhady Jaber, Mohsin Noori Hamzah

{"title":"A methodological approach for detecting multiple faults in wind turbine blades based on vibration signals and machine learning","authors":"Ahmed Ali Farhan Ogaili, Alaa Abdulhady Jaber, Mohsin Noori Hamzah","doi":"10.1515/cls-2022-0214","DOIUrl":"https://doi.org/10.1515/cls-2022-0214","url":null,"abstract":"Abstract Wind turbines generate clean and renewable energy for the international market. The most ‎‎important aspect of wind turbine maintenance is reducing failures, downtime, and operating and maintenance expenses. ‎This study aims to detect multiple faults exhibited by wind turbine blades; failures such as cracks (tip crack, mid-span crack, and crack ‎near the root) were observed in the blades at different locations. The research suggests a new approach, incorporating vibration signals and machine learning techniques to identify various failures in wind turbine blades. The technology of ranking features such as ReliefF algorithms, chi-squares, and information gains was adopted to discuss a method framework to diagnose several problems in wind turbine blades, such as cracks in different locations. The k-nearest neighbors (KNNs), support vector machines, and random forests are used to classify data based on measured vibration signals. The eight main time-domain features are calculated from the vibration signals. The proposed methodology was validated using four databases. The results showed good classification accuracy in four databases, with at least three non-conventional features in each database’s top nine features of the three classification techniques. The results also showed that when the ReliefF selection algorithm is applied with the KNN classification algorithm, it generates the highest classification accuracy under all failure conditions, and the value is 97%. Finally, the performance of the proposed classification model is compared with other machine learning classification models, and a promising result is obtained. ‎","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135650000","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

Temperature-dependent mechanical properties of Al/Cu nanocomposites under tensile loading via molecular dynamics method 分子动力学方法研究拉伸载荷下Al/Cu纳米复合材料的温度相关力学性能

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0009

M. Abdulrehman, M. Hussein, I. Marhoon

{"title":"Temperature-dependent mechanical properties of Al/Cu nanocomposites under tensile loading via molecular dynamics method","authors":"M. Abdulrehman, M. Hussein, I. Marhoon","doi":"10.1515/cls-2022-0009","DOIUrl":"https://doi.org/10.1515/cls-2022-0009","url":null,"abstract":"Abstract Al-Cu Nanocomposites (NCs) are widely used in industrial applications for their high ductility, light weight, excellent thermal conductivity, and low-cost production. The mechanical properties and deformation mechanisms of Metal Matrix NCs (MMNCs) strongly depend on the matrix microstructure and the interface between the matrix and the second phase. The present study relies on Molecular Dynamics (MD) to investigate the effects of temperature on the mechanical properties and elastic and plastic behavior of the Al-Cu NC with single-crystal and polycrystalline matrices. The effects of heating on microstructural defects in the aluminum matrix and the Al/Cu interface were also addressed in the following. It was found that the density of defects such as dislocations and stacking fault areas are much higher in samples with polycrystalline matrices than those with single-crystal ones. Further, by triggering thermally activated mechanisms, increasing the temperature reduces the density of crystal defects. Heating also facilitates atomic migration and compromises the yield strength and the elastic modulus as a result of the increased energy of atoms in the grain boundaries and in the Al-Cu interface. The results showed that the flow stress decreased in all samples by increasing the temperature, making them less resistant to the plastic deformation.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"96 - 104"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47719305","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

Numerical and experimental investigation of two phase flow geometrical characteristics 两相流几何特性的数值与实验研究

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0018

Hyder M. Abdul Hussein, Sabah T Ahmed, L. Habeeb

引用次数: 1

Optimization of mechanical wear resistance for recycled (Al-Mg-Si) reinforced SiC composite material using PM method PM法优化再生（Al-Mg-Si）增强SiC复合材料的机械耐磨性

IF 1.5

Curved and Layered Structures Pub Date : 2022-01-01 DOI: 10.1515/cls-2022-0023

S. Omran, M. M. Al-Masoudy, O. H. Hassoon, M. Fayad

{"title":"Optimization of mechanical wear resistance for recycled (Al-Mg-Si) reinforced SiC composite material using PM method","authors":"S. Omran, M. M. Al-Masoudy, O. H. Hassoon, M. Fayad","doi":"10.1515/cls-2022-0023","DOIUrl":"https://doi.org/10.1515/cls-2022-0023","url":null,"abstract":"Abstract Recently, the increasing demand for advanced materials around the world led to search on require and optimal materials characteristics. An alloy (Al-Mg-Si) named hindalium was used in this study which made from aluminum recycling (aluminums sandwich panel plates). In addition, powder technology was applied to investigate the effect of adding silicon carbide (SiC) particles on the composite properties that enter in fabricate of disc brake rotors. The main reason to use this technology is a single material cannot meet the demands of an extreme engineering setting that encourage towards necessitating the use of composites. Metal matrix composites are a type of material that has a lot of potential for components and structural applications that require a lot of unique modulus, strength, and durability as well as in the same time being light in weight. The composites materials of metal base with good properties are becoming now widely used in several industrial sectors due to their high mechanical properties and resistant to wear. Al-Mg-Si alloys are a common material category because of their inherent hardness, and corrosion resistance. The properties of hardness, wear rate, and microstructure are the physical and mechanical tests were performing in this study. It is indicated that the modeling with using a Genetic Algorithm is the best solution to choose the samples that have been prepared. According to the results, it was observed that the hardness increased by 14% at 15%SiC content and the wear rate decreased by 17% as comparing with the base alloy used in this study.","PeriodicalId":44435,"journal":{"name":"Curved and Layered Structures","volume":"9 1","pages":"295 - 303"},"PeriodicalIF":1.5,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45798634","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