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Compensation of stress intensity factors in hollow cylinders containing several cracks under torsion by electro-elastic coating

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Applied mathematics and mechanics(english edition) 2019年第9期40卷 1335-1360页

作者： m. KARImI A. GHASSemI A. ATRIAN m. VAHABI Department of mechanical engineering Najafabad Branch Islamic Azad University Najafabad Iran modern manufacturing Technologies Research Center Najafabad Branch Islamic Azad University Najafabad Iran

In this article, a formulation for a hollow cylinder reinforced with an electroelastic layer is investigated. The hollow cylinder and its electro-elastic coating are under the Saint-Venant torsional loading. First, the solution to the problem containing a Volterra-type screw dislocation is obtained by using the Fourier transform. The problem is then reduced to a set of Cauchy singular integral equations by the distributed dislocation method. Finally, several examples are presented to show the effect of the electro-elastic coating on the reduction of the stress intensity factors at the crack tips.

关键词： hollow cylinder electro-elastic coating stress intensity factor multiple arbitrarily oriented cracks Saint-Venant torsion electric displacement

Shear modulus and damping ratio of sand-granulated rubber mixtures

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Journal of Central South University 2015年第8期22卷 3159-3167页

作者： m.ehsani N.Shariatmadari S.m.mirhosseini School of Civil engineering Iran University of Science and Technology Department of Civil engineering Amirkabir University of Technology

Recycled waste tires when mixed with soil can play an important role as lightweight materials in retaining walls and embankments, machine foundations and railroad track beds in seismic zones. Having high damping characteristic, rubbers can be used as either soil alternative or mixed with soil to reduce vibration when seismic loads are of great concern. Therefore, the objective of this work was to evaluate the dynamic properties of such mixtures prior to practical applications. To this reason, torsional resonant column and dynamic triaxial experiments were carried out and the effect of the important parameters like rubber content and ratio of mean grain size of rubber solids versus soil solids(D50,r/D50,s) on dynamic response of mixtures in a range of low to high shearing strain amplitude from about 4×10-4% to 2.7% were investigated. Considering engineering applications, specimens were prepared almost at the maximum dry density and optimum moisture content to model a mixture layer above the ground water table and in low precipitation region. The results show that tire inclusion significantly reduces the shear modulus and increases the damping ratio of the mixtures. Also decrease in D50,r/D50,s causes the mixture to exhibit more rubber-like behavior. Finally, normalized shear modulus versus shearing strain amplitude curve was proposed for engineering practice.

关键词： sand-rubber mixture shear modulus damping ratio low to high shear strain amplitude cyclic triaxial test torsionalresonant column test granular rubber

Analytical solution of multiple moving cracks in functionally graded piezoelectric strip

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Applied mathematics and mechanics(english edition) 2015年第6期36卷 777-792页

作者： R.BAGHeRI m.AYATOLLAHI S.m.mOUSAVI Faculty of engineering University of Zanjan Department of Civil and Structural engineering Aalto University

The dynamic behaviors of several moving cracks in a functionally graded piezoelectric （FGP） strip subjected to anti-plane mechanical loading and in-plane elec- trical loading are investigated. For the first time, the distributed dislocation technique is used to construct the integral equations for FGP materials, in which the unknown variables are the dislocation densities. With the dislocation densities, the field intensity factors are determined. moreover, the effects of the speed of the crack propagation on the field intensity factors are studied. Several examples are solved, and the numerical results for the stress intensity factor and the electric displacement intensity factor are presented graphically finally.

关键词： functionally graded piezoelectric dislocation density moving crack strip

Band structure,Fermi surface,elastic,thermodynamic,and optical properties of AlZr3,AlCu3,and AlCu2Zr:First-principles study

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Chinese Physics B 2016年第8期25卷 103-112页

作者： Parvin R Parvin F Ali m S Islam A K m A Department of Physics Rajshahi University Rajshahi-6205 Bangladesh Department of Physics Pabna University of Science and Technology Pabna 6600 Bangladesh International Islamic University Chittagong 154/A College Road Chittagong-4203 Bangladesh

The electronic properties（Fermi surface,band structure,and density of states（DOS）） of Al-based alloys Alm3（m=Zr and Cu） and AlCu2Zr are investigated using the first-principles pseudopotential plane wave method within the generalized gradient approximation（GGA）.The structural parameters and elastic constants are evaluated and compared with other available ***,the pressure dependences of mechanical properties of the compounds are *** temperature dependence of adiabatic bulk modulus,Debye temperature,specific heat,thermal expansion coefficient,entropy,and internal energy are all obtained for the first time through quasi-harmonic Debye model with phononic effects for T = 0 K-100 *** parameters of optical properties（dielectric functions,refractive index,extinction coefficient,absorption spectrum,conductivity,energy-loss spectrum,and reflectivity） of the compounds are calculated and discussed for the first *** reflectivities of the materials are quite high in the IR-visible-UV region up to ~ 15 eV,showing that they promise to be good coating materials to avoid solar *** of the properties are also compared with those of the Al-based Ni3 Al compound.

关键词： first principle calculations Fermi surface elastic moduli entropy and internal energy optical properties

BIOLOGICAL TASK mAPPING AND SCHeDULING IN WIReLeSS SeNSOR NeTWORKS

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BIOLOGICAL TASK MAPPING AND SCHEDULING IN WIRELESS SENSOR NE...

microstructure evolution of a recycled Al-Fe-Si-Cu alloy processed by tube channel pressing

2009 Ieee International Conference on Communication Technology and Applications（ICCTA2009）

作者： Yousef e.m.Hamouda Chris Phillips School of electronic engineering and Computer Science Queen Mary University of London Mile End RoadLondonE1 4NSUnited Kingdom

ISBN: (纸本)9781424448166

＜正＞The increasingly complex roles for which Wireless Sensor Networks（WSNs） are being employed have driven the desire for autonomic self-organized capabilities for coordinated network operation.A Biological Task mapping and Scheduling（BTmS） algorithm is presented in this paper to execute an application using a group of *** is inspired from biological behaviors of differentiation in zygote *** results show that BTmS leads to improved network lifetime,energy consumption and service time compared with other commonly used algorithms.

关键词： Wireless Sensor Networks task mapping and scheduling biological behaviors

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International Journal of minerals,metallurgy and materials 2018年第10期25卷 1166-1172页

作者： m.H.Farshidi m.Rifai H.miyamoto Department of materials Science and metallurgical engineering Ferdowsi University of Mashhad Department of mechanical engineering Doshisha University

Although excellent recyclability is one of the advantages of Al alloys, a recycling process can reduce different properties of these alloys by adding coarse AlFeSi particles into the alloys' microstructures. One of the well-known methods for modifying the microstructure of metallic materials is the imposition of severe plastic deformation(SPD). Nevertheless, the microstructure evolutions of recycled Al alloys containing extraordinary fractions of AlFeSi particles during SPD processing have seldom been considered. The aim of the present work is to study the microstructure evolution of a recycled Al–Fe–Si–Cu alloy during SPD processing. For this purpose, tubular specimens of the mentioned alloy were subjected to different numbers of passes of a recently developed SPD process called tube channel pressing(TCP); their microstructures were then studied using different techniques. The results show that coarse AlFeSi particles are fragmented into finer particles after processing by TCP. However, decomposition and dissolution of AlFeSi particles through TCP processing are negligible. In addition, TCP processing results in an increase in hardness of the alloy, which is attributed to the refinement of grains, to an increase of the dislocation density, and to the fragmentation of AlFeSi particles.

关键词： AlFeSi intermetallic particle severe plastic deformation microstructure tube channel pressing

Recent results from the KeDR detector

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Chinese Physics C 2010年第6期34卷 650-655页

作者： V.V.Anashin V.m.Aulchenko e.m.Baldin A.K.Barladyan A.Yu.Barnyakov m.Yu.Barnyakov S.e.Baru I.V.Bedny O.L.Beloborodova A.e.Blinov V.e.Blinov A.V.Bobrov V.S.Bobrovnikov A.V.Bogomyagkov A.e.Bondar A.R.Buzykaev S.I.eidelman Yu.m.Glukhovchenko V.V.Gulevich D.V.Gusev S.e.Karnaev S.V.Karpov T.A.Kharlamova V.A.Kiselev S.A.Kononov K.Yu.Kotov e.A.Kravchenko V.F.Kulikov G.Ya.Kurkin e.A.Kuper e.B.Levichev D.A.maksimov V.m.malyshev A.L.maslennikov A.S.medvedko O.I.meshkov S.I.mishnev I.I.morozov N.Yu.muchnoi V.V.Neufeld S.A.Nikitin I.B.Nikolaev I.N.Okunev A.P.Onuchin S.B.Oreshkin I.O.Orlov A.A.Osipov S.V.Peleganchuk S.G.Pivovarov P.A.Piminov V.V.Petrov A.O.Poluektov I.N.Popkov V.G.Prisekin A.A.Ruban V.K.Sandyrev G.A.Savinov A.G.Shamov D.N.Shatilov B.A.Shwartz e.A.Simonov S.V.Sinyatkin Yu.I.Skovpen A.N.Skrinsky V.V.Smaluk A.V.Sokolov A.m.Sukharev e.V.Starostina A.A.Talyshev V.A.Tayursky V.I.Telnov Yu.A.Tikhonov K.Yu.Todyshev G.m.Tumaikin Yu.V.Usov A.I.Vorobiov A.N.Yushkov V.N.Zhilich V.V.Zhulanov A.N.Zhuravlev Budker Institute of Nuclear Physics Novosibirsk State University Novosibirsk State Technical University 20Karl Marx prospectNovosibirsk630092Russia

We report results of experiments performed with the KeDR detector at the VePP-4m e^＋e^- collider. They include precise measurement of the D^0 and D^± meson masses, determination of the ψ（3770） resonance parameter... 详细信息

关键词： D meson ψ(3770) mass narrow resonances

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Compaction Characteristics of Common Reeds and mechanism for Solid Biofuel Production

作者： m.e.·所罗门(m.e. Solomon)

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Compaction Characteristics of Common Reeds and Mechanism for...