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Digitale Medien

CYCLIC CRACK RESISTANCE OF WELDED JOINTS WITH NON-UNIFORM FIELDS OF RESIDUAL WELDING STRESSES (1996)

Trufiakov, V. I. ; Mikheev, P. P. ; Knysh, V. V. ; [weitere]

Oxford, UK : Blackwell Publishing Ltd

Fatigue & fracture of engineering materials & structures 19 (1996), S. 0

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ISSN: 1460-2695

Quelle: Blackwell Publishing Journal Backfiles 1879-2005

Thema: Maschinenbau

Notizen: Abstract— The use of linear elastic fracture mechanics to describe the kinetics of fatigue fracture of welded joints with high welding residual stresses (WRS) is experimentally evaluated in this paper. A correction analysis is used to show that the crack propagation rate of cracks in joints, as a function of the applied stress intensity factor, is linear on a log-log scale in the Paris regime when non-uniform fields of WRS are superimposed on the applied cyclic loading. It is shown that crack growth rates in joints with high WRS do not depend on the characteristics of the loading cycle. The parameters of the Paris exponential equation are determined by the initial WRS distribution, by the range of cyclic stresses and by the load ratio. A method for calculating the cyclic crack resistance of joints is proposed which explicitly allows for a non-uniform field of WRS that influences the fatigue crack growth rate.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1111/j.1460-2695.1996.tb01314.x

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Facile Droplet-based Microfluidic Synthesis of Monodisperse IV–VI Semiconductor Nanocrystals with Coupled In-Line NIR Fluorescence Detection (2014)

Lignos, Ioannis ; Protesescu, Loredana ; Stavrakis, Stavros ; [weitere]

American Chemical Society

In: Chemistry of Materials. 2014; 26(9): 2975-2982. Published 2014 Apr 07. doi: 10.1021/cm500774p.

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Publikationsdatum: 2014-04-07

Print ISSN: 0897-4756

Digitale ISSN: 1520-5002

Thema: Chemie und Pharmazie , Maschinenbau

Publiziert von American Chemical Society

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Thermoelectric properties of semiconductor-metal composites produced by particle blending (2016)

Yu Liu, Doris Cadavid, Maria Ibáñez, Silvia Ortega, Sara Martí-Sánchez, Oleksandr Dobrozhan, Maksym V. Kovalenko, Jordi Arbiol and Andreu Cabot

American Institute of Physics (AIP)

In: APL Materials

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Publikationsdatum: 2016-08-30

Beschreibung: In the quest for more efficient thermoelectric material able to convert thermal to electrical energy and vice versa, composites that combine a semiconductor host having a large Seebeck coefficient with metal nanodomains that provide phonon scattering and free charge carriers are particularly appealing. Here, we present our experimental results on the thermal and electrical transport properties of PbS-metal composites produced by a versatile particle blending procedure, and where the metal work function allows injecting electrons to the intrinsic PbS host. We compare the thermoelectric performance of composites with microcrystalline or nanocrystalline structures. The electrical conductivity of the microcrystalline host can be increased several orders of magnitude with the metal inclusion, while relatively high Seebeck coefficient can be simultaneously conserved. On the other hand, in nanostructured materials, the host crystallites are not able to sustain a band bending at its interface with the metal, becoming flooded with electrons. This translates into even higher electrical conductivities than the microcrystalline material, but at the expense of lower Seebeck coefficient values.

Digitale ISSN: 2166-532X

Thema: Maschinenbau

Publiziert von American Institute of Physics (AIP)

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Magnetic iron oxides in the cementation technology of the boron-containing radioactive waste (2015)

M A Fedotov, O A Gorbunova, O V Fedorova, G E Folmanis and L V Kovalenko

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2015-04-24

Beschreibung: Two ways of synthesis of non-detachable dispersed particles of magnetic materials useful for the boron-containing waste cementation process regulation were developed. Powder XRD showed that the method of carbothermic recovery of nanoscale iron hydroxide allows obtaining a mixture of iron oxides with content of the magnetic phase up to 70%. Method of low-temperature hydrogen reduction of the raw materials allows obtaining various compositions of a-iron and iron oxides with the possibility to change the size of the final particles in a wide range. The possibility of using composites of magnetic iron oxides and metal oxide compositions instead of ferromagnetic rods with VEP of boron-containing liquid radioactive waste in the fluidized field was studied. It was shown that the use of fine and nano particles of the iron oxides in the pre-treatment of the boron-containing LRW increases the strength of the final compounds and accelerates the cement setting compounds from 13 to 5-9 days.

Print ISSN: 1757-8981

Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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Materials, Vol. 4, Pages 651-702: Magnetoelectric Interactions in Lead-Based and Lead-Free Composites (2011)

Mirza Bichurin; Vladimir Petrov; Anatoly Zakharov; Denis Kovalenko; Su Chul Yang; Deepam Maurya; Vishwas Bedekar; Shashank Priya

MDPI Publishing

In: Materials

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Publikationsdatum: 2011-07-21

Beschreibung: Magnetoelectric (ME) composites that simultaneously exhibit ferroelectricity and ferromagnetism have recently gained significant attention as evident by the increasing number of publications. These research activities are direct results of the fact that multiferroic magnetoelectrics offer significant technological promise for multiple devices. Appropriate choice of phases with co-firing capability, magnetostriction and piezoelectric coefficient, such as Ni-PZT and NZFO-PZT, has resulted in fabrication of prototype components that promise transition. In this manuscript, we report the properties of Ni-PZT and NZFO-PZT composites in terms of ME voltage coefficients as a function of frequency and magnetic DC bias. In order to overcome the problem of toxicity of lead, we have conducted experiments with Pb-free piezoelectric compositions. Results are presented on the magnetoelectric performance of Ni-NKN, Ni-NBTBT and NZFO-NKN, NZFO-NBTBT systems illustrating their importance as an environmentally friendly alternative.

Digitale ISSN: 1996-1944

Thema: Maschinenbau

Publiziert von MDPI Publishing

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Predictive Multiscale Modeling of Nanocellulose Based Materials and Systems (2014)

Andriy Kovalenko

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2014-08-23

Beschreibung: Cellulose Nanocrysals (CNC) is a renewable biodegradable biopolymer with outstanding mechanical properties made from highly abundant natural source, and therefore is very attractive as reinforcing additive to replace petroleum-based plastics in biocomposite materials, foams, and gels. Large-scale applications of CNC are currently limited due to its low solubility in non-polar organic solvents used in existing polymerization technologies. The solvation properties of CNC can be improved by chemical modification of its surface. Development of effective surface modifications has been rather slow because extensive chemical modifications destabilize the hydrogen bonding network of cellulose and deteriorate the mechanical properties of CNC. We employ predictive multiscale theory, modeling, and simulation to gain a fundamental insight into the effect of CNC surface modifications on hydrogen bonding, CNC crystallinity, solvation thermodynamics, and CNC compatibilization with the existing...

Print ISSN: 1757-8981

Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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Application of electric erosion machining for the restoration of splined surfaces (2018)

A T Kulakov, E P Barylnikova, F L Nazarov, S Yu Kovalenko and K V Gribkov

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2018-10-24

Beschreibung: The paper presents an analysis of the possibility of using electric erosive machining when restoring splined surfaces on specialized equipment.

Print ISSN: 1757-8981

Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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Magnetoelectric effects at electromechanical resonance in laminates of lead-free piezoelectric bimorph and magnetostrictive component (2018)

V.M. Petrov, M I Bichurin, D.V. Kovalenko and O.I. Malyshev

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2018-11-03

Beschreibung: The paper presents a theoretical model for magnetoelectric (ME) effect in multilayers of piezoelectric and magnetostrictive components. We assume the piezoelectric layer to be compositionally-stepped. Taking into account the toxicity of lead-based ceramic, piezoelectric component is made of a lead-free piezoelectric. Analytical expressions for ME voltage coefficients is obtained by substituting the expression for stress at bending mode into open electric circuit condition. Using the layered structure based on the compositionally-stepped piezoelectric components leads to an enhanced magnetoelectric coupling for specific component thickness ratio due to an increase in flexural deformation as compared with the bilayer based on homogeneous piezoelectric layer. For the laminate of lead-free piezoelectric langatate bimorph and magnetostrictive Permendur, ME coupling is stronger due to higher ratio of the piezoelectric coupling coefficient to the dielectric constant. In addition, an 80...

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Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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Evaluation of rotor axial vibrations in a turbo pump unit equipped with an automatic unloading machine (2017)

V A Martsynkovskyy, A Deineka and V Kovalenko

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2017-08-31

Beschreibung: The article presents forced axial vibrations of the rotor with an automatic unloading machine in an oxidizer pump. A feature of the design is the use in the autoloading system of slotted throttles with mutually inverse throttling. Their conductivity is determined by a numerical experiment in the ANSYS CFX software package.

Print ISSN: 1757-8981

Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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Mechanics of external fixation device of spine: reducing the mounting stress (2018)

V V Piven, S V Lyulin, P I Kovalenko and Yu A Mushtaeva

Institute of Physics (IOP)

In: IOP Conference Series: Materials Science and Engineering

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Publikationsdatum: 2018-04-15

Beschreibung: During the installation of the external fixation device on the spine, there is an occurrence of mounting stress due to misalignment of the rod-screws. To determine the magnitude of the mounting stresses, mathematical dependencies are sometimes used. The proposed technical solution is to reduce stress in the external fixation device.

Print ISSN: 1757-8981

Digitale ISSN: 1757-899X

Thema: Maschinenbau

Publiziert von Institute of Physics (IOP)

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