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Free vibration analysis of laminated FG-CNT reinforced composite beams using finite element method

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Frontiers of Structural and Civil Engineering 2019年第2期13卷 324-336页

作者： T.VO-DUY V.HO-HUU T.NGUYEN-THOI Division of Computational Mathematics and Engineering Institute for Computational ScienceTon Due Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Due Thang UniversityHo Chi Minh CityVietnam

In the present study, the free vibration of laminated functionally graded carbon nanotube reinforced composite beams is analyzed. The laminated beam is made of perfectly bonded carbon nanotubes reinforced composite (CNTRC) layers. In each layer, single-walled carbon nanotubes are assumed to be unifonnly distributed (UD) or functionally graded (FG) distributed along the thickness direction. Effective material properties of the two-phase composites, a mixture of carbon nanotubes (CNTs) and an isotropic polymer, are calculated using the extended nile of mixture. The first-order shear deformation theory is used to formulate a governing equation for predicting free vibration of laminated functionally graded carbon nanotubes reinforced composite (FG?CNTRC) beams. The governing equation is solved by the finite element method with various boundary conditions. Several numerical tests are perfbnned to investigate the influence of the CNTs volume fractions, CNTs distributions, CNTs orientation angles, boundary conditions, length-to-thickness ratios and the numbers of layers on the frequencies of the laminated FG-CNTRC beams. Moreover, a laminated composite beam combined by various distribution types of CNTs is also studied.

关键词： free vibration analysis laminated FG-CNTRC beam finite element method first-order shear deformation theory composite material

Deformation behavior and crack propagation on interface of Al/Cu laminated composites in uniaxial tensile test

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Rare Metals 2020年第3期39卷 296-303页

作者： Xiao-Bing Li Yuan Yang Yu-Song Xu Guo-Yin Zu School of Metallurgical and Materials Engineering Jiangsu University of Science and Technology(Zhangjiagang)Suzhou215600China School of Materials Science and Engineering Northeastern UniversityShenyang110819China

The microstructural characterization and uniaxial tensile tests of Al/Cu laminated composites were taken to investigate the interface effect and fracture process of the composites.The electron microscopic graphs before and after tensile test were used to evaluate the fracture behavior.Experimental results show that the fracture surfaces of laminated composites mainly present brittle failure characteristics,accompanied with several dimples on the matrixes and a few tearing on the interface.Cracks generally initiate from the interfacial interlayer and variously propagate depending on the interfacial bonding.It is found that Cu/Al interface with enhanced bonding strength generally hinders the propagation of interlayer cracks,while the interface with weak bonding delaminates by the cracks propagation through the interfacial defects.The additional shear stress on the interface between Cu and Al layers due to their different tensile ductilities aggravates the interfacial propagation of cracks.The local plastic deformation of individual matrix layer then occurs after cracks coalesce and failure in the interface.Therefore,the strong bonding interface and matching properties between individual matrix layers are required to improve the fracture performance of Al/Cu laminated composites.

关键词： laminated composite Interface Failure analysis Bonding Electron microscopy

Experimental and simulation studies on delamination strength of laminated glass composites having polyvinyl butyral and ethyl vinyl acetate inter-layers of different critical thicknesses

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Defence Technology（防务技术） 2018年第4期14卷 313-317页

作者： Ajitanshu Vedrtnam Department of Applied Mechanics Motilal Nehru National Institute of Technology Allahabad Department of Mechanical Engineering Invertis University

The laminated glasses(LGs)composites are gaining popularity as protectivestructural material. Delamination strength(DS) of(LGs) with different inter-layers and their different nominal thicknesses were compared. The effect of inter-layer thickness, delamination load, and inter-layer type on DS is clearly observed from this brief study. It is concluded that inter-layer thickness has the significant role in determining the DS of LGs. The statistical analysis confirmed the strong association of DS with inter-layer thickness and the interlayer type. It was found that the LG-PVB composite has the comparatively lower DS than LG-EVA composite and inter-layer thickness has the prominent role in the determination of DS in the LG-EVAcomposite. There is an increment in DS with an increment in critical inter-layer thickness in both LG-EVA and LG-PVBcomposites. The increment in the inter-layer thickness from 0.38 mm to 0.76 mm increases DS significantly; whereas, the further increment in the inter-layer thickness to the higher value has a lesser effect. The finite element model was constituted(without considering the effect of temperature) for determining DS of LG composite. The simulation results were in a good match with experimental results. The results of the present work can be utilized by the design engineers while selecting LG for structural applications.

关键词： Delamination strength Composite material PVB laminated glass Finite element analysis

Comparison of three processing methods for laminated bamboo timber production

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Journal of Forestry Research 2019年第1期30卷 363-369页

作者： Edi Suhaimi Bakar Muhammad Nadzim Mohd Nazip Rogerson Anokye Lee Seng Hua Faculty of Forestry Universiti Putra Malaysia Institute of Tropical Forestry and Forest Products (INTROP) Universiti Putra Malaysia

Three processing techniques, split-squaring(SS),V-grooving(VG), and split-edging(SE), were evaluated and compared in terms of their processing time and recovery. Semantan bamboo(Gigantochloa scortechinii Gamble) was used as a raw material and the results showed that the VG-method required the longest processing time(32.1 min), followed by the SS-method(18.2 min), and the SE-method(17.9 min). However, the VG-method showed the highest recovery(82.0%) compared to the SS-method and SE-method, 31.0 and 49.4%, respectively. When both processing time and recovery factors were combined with the same weighing factor, the highest value was recorded with the VG-method(49.1), while the SE-method had values of 31.1 and the SS-method 12.8. The results suggest that the VG-method is the best option. However, the V-grooving machine is still a prototype and therefore the SE-method could be an alternative option until the improved V-grooving machine is available.

关键词： Bamboo culm laminated bamboo timber Vgrooving method Split-squaring method Split-edging method

On the durable critic load in creep buckling of viscoelastic laminated plates and circular cylindrical shells

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Science China(Physics,Mechanics & Astronomy) 2008年第7期51卷 873-882页

作者： PENG Fan FU YiMing LIU YiFan College of Mechanics and Aerospace Hunan UniversityChangsha 410082China

Based on the first order shear deformation theory and classic buckling theory, the paper investigates the creep buckling behavior of viscoelastic laminated plates and laminated circular cylindrical shells. The analysis and elaboration of both instantaneous elastic critic load and durable critic load are emphasized. The buckling load in phase domain is obtained from governing equations by applying Laplace transform, and the instantaneous elastic critic load and durable critic load are determined according to the extreme value theorem for inverse Laplace transform. It is shown that viscoelastic approach and quasi-elastic approach yield identical solutions for these two types of critic load respectively. A transverse disturbance model is developed to give the same mechanics significance of durable critic load as that of elastic critic load. Two types of critic loads of boron/epoxy composite laminated plates and circular cylindrical shells are discussed in detail individually, and the influencing factors to induce creep buckling are revealed by examining the viscoelasticity incorporated in transverse shear deformation and in-plane flexibility.

关键词： Viscoelasticity laminated plate and shell creep buckling instantaneous elastic critic load durable critic load transverse shear deformation

IDENTIFICATION OF STIFFNESS COEFFICIENTS OF laminated COMPOSITE PLATES

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中国有色金属学会会刊：英文版 1997年第3期7卷 46-50页

作者： Wang, XC Shen, XP Yuichiro, M Xu, BY N CHINA UNIV TECHNOL BEIJING 100041PEOPLES R CHINA TSING HUA UNIV DEPT MECH ENGNBEIJING 100084PEOPLES R CHINA IBARAKI UNIV DEPT ENGNHITACHIIBARAKI 316JAPAN

ＩＤＥＮＴＩＦＩＣＡＴＩＯＮＯＦＳＴＩＦＦＮＥＳＳＣＯＥＦＦＩＣＩＥＮＴＳＯＦＬＡＭＩＮＡＴＥＤＣＯＭＰＯＳＩＴＥＰＬＡＴＥＳ①ＷａｎｇＸｉａｏｃｈｕｎ，ＳｈｅｎＸｉｎｐｕ，ＭａｓｕｄａＹｕｉｃｈｉｒｏ，ＸｕＢｉｎｇ... 详细信息

ＩＤＥＮＴＩＦＩＣＡＴＩＯＮＯＦＳＴＩＦＦＮＥＳＳＣＯＥＦＦＩＣＩＥＮＴＳＯＦＬＡＭＩＮＡＴＥＤＣＯＭＰＯＳＩＴＥＰＬＡＴＥＳ①ＷａｎｇＸｉａｏｃｈｕｎ，ＳｈｅｎＸｉｎｐｕ，ＭａｓｕｄａＹｕｉｃｈｉｒｏ，ＸｕＢｉｎｇｙｅＮｏｒｔｈＣｈｉｎａＵｎｉｖｅ...

关键词： inverse analysis composite laminated plate stiffness coefficient

Facile oxalic acid-assisted construction of laminated porous N-deficient graphitic carbon nitride: Highly efficient visible-light-driven hydrogen evolution photocatalyst

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Journal of Energy Chemistry 2019年第6期28卷 1-8页

作者： Fengli Yang Jia Ren Qianqian Liu Lu Zhang Yuanyuan Chai Wei-Lin Dai Department of Chemistry & Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University

The laminated porous N-deficient g-C3N4(CN–H)is successfully synthesized by a facile two-step hydrothermal calcination method using oxalic acid-assisted melamine as the precursor.Compared with pristine g-C3N4(224μmol g-1h-1),the CN–H shows superior photocatalytic hydrogen production activity(up to 728μmol g-1h-1),which is three times higher than the unmodified counterpart.To draw out the multifaceted influences of oxalic acid modification on the visible-light-induced photocatalytic activity,various techniques are utilized to investigate the formation mechanism,structural characteristics and photoelectrical properties of CN–H.The results indicate that the addition of a trace amount of oxalic acid to the precursor melamine results in a g-C3N4 structure possessing the advantage of both nitrogen defects and laminated porosity.These properties can enlarge specific surface areas of g-C3N4,enhance an efficient separating of photogenerated electron-hole pairs and extend the range of spectral response,all contributing to the enhancement of the visible-light-induced photocatalytic activity.

关键词： Oxalic acid Melamine laminated porous N-deficient g-C3N4 Visible-light-induced photocatalytic activity for H2 generation

Analysis of High-Cr Cast Iron/Low Carbon Steel Wear-resistant laminated Composite Plate Prepared by Hot-rolled Symmetrical Billet

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Computer Modeling in Engineering & Sciences 2018年第10期117卷 109-123页

作者： Yanwei Li Yugui Li Peisheng Han Shun Wang Zhengyi Jiang Xiaogang Wang Shanxi Provincial Key Laboratory of Metallurgical Device Design Theory and Technology(State Key Laboratory Cultivation Base of Province-Ministry Co-Construct) Taiyuan University of Science and TechnologyTaiyuanChina School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongWollongong NSW2522Australia

This study developed a new technology for preparing high-chromium cast iron(HCCI)/low-carbon steel(LCS)wear-resistant composite plates by hot rolling at a 1050°C and a rolling speed of 0.2 m/s.The effects of different rolling reductions(30%,45%,and 60%)on the microstructure(interface and HCCI layer)and mechanical properties(bonding strength,hardness,and wear resistance)of the composite plate were studied.SEM images showed that when the reduction was increased,no impurities and interlayers were found between the microscopic interfaces after hot rolling,and the bonding interface exhibited a wave-like shape.EDS analysis showed that the Cr element diffusion between two metals after hot rolling was promoted when the reduction was increased,thereby improving the bonding quality under the same rolling temperature and rolling speed.Experiments showed that due to the stress release effect of the LCS of the cladded layer,the macro-slab shape after hot rolling performed well,and the brittle HCCI layer underwent thermoplastic deformation without cracking.Moreover,the increase of rolling reduction improved the bonding quality.As the rolling reduction was increased,the volume fraction of Cr-carbides in the HCCI layer also increased,resulting in an increase of hardness and wear-resistance.

关键词： High chromium cast iron symmetrical billet hot rolled laminated composite plate

ON THE STABILITY OF A THERMOELASTIC laminated BEAM

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Acta Mathematica Scientia 2019年第6期39卷 1517-1524页

作者： Tijani A.APALARA Department of Mathematics University of Hafr Al-Batin

In this paper we consider a one-dimensional laminated beam system. The only dissipation in the system is through heat conduction in the interfacial slip equation. We prove that this unique dissipation is strong enough to exponentially stabilize the system provided the wave speeds of the system are equal. This result extends previous works where additional internal or boundary controls were used together with a frictional damping in the interfacial slip.

关键词： laminated beam interfacial slip thermoelasticity exponential stability