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Article
Publication date: 20 February 2014

V. Lepov and N. Petrov

In the last years the problems of energy security and technogenic safety for northeast of Russia are closely connected to development of the Smart Grid technology and new…

66

Abstract

In the last years the problems of energy security and technogenic safety for northeast of Russia are closely connected to development of the Smart Grid technology and new structural and functional materials. Particularly the high chemical durability and cold resistance of basalt composite materials in association with them low thermal conductivity and light weight stipulate the wide applications in building industry and power engineering in the North. The complex research of the main problems of energy security and technogenic safety for the northeast of Russia through smart grid technology has been presented.

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World Journal of Engineering, vol. 10 no. 6
Type: Research Article
ISSN: 1708-5284

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Article
Publication date: 12 July 2013

V. Lepov

The complex evolution and hierarchical approach to the modeling of the heterogeneous viscous-plastic damaging media fracture process were considered. The model of stochastic crack…

33

Abstract

The complex evolution and hierarchical approach to the modeling of the heterogeneous viscous-plastic damaging media fracture process were considered. The model of stochastic crack growth in presence of other defects discussed here allows one to address the process of crack propagation on the basis of microdefects nucleation mechanism, the small cracks growth and coalescence under the external stress and hydrogen effect. Macroscopic model based on the deterministic approach simulates the damage accumulation process and fracture of metal during the hydrogen induced delayed fracture. We also model damage accumulation up to the critical state of a material. Statistical parameters can be estimated experimentally, by the optical and electronic probes, by fractography and by the scanning tunneling "in situ" microscopy methods. Applications to modeling of hot tearing of an aluminum alloy during the solidification process are discussed.

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World Journal of Engineering, vol. 10 no. 3
Type: Research Article
ISSN: 1708-5284

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Article
Publication date: 29 June 2012

V. Lepov and A. Loginov

The new multiscale non-Markov evolution modeling approach for damage accumulation and fracture processes of polycrystalline and ultra fine grained materials is proven by…

28

Abstract

The new multiscale non-Markov evolution modeling approach for damage accumulation and fracture processes of polycrystalline and ultra fine grained materials is proven by experimental results at nanoscale. Microstructural parameters are estimated by an atomic-force scanning probe in situ during the deformation. The non-Marcov evolution in the approach means taking into account the history of each element on a certain structure. The ultimate state of the current level controls the transfer on the next level of the whole structure. The main difficulty of traditional multiscale modeling is the determination of the ultimate states due to the parameters. This new approach presumes it is possible to restrict the current state of a material to only one control factor of nanostructure order. The new approach of defect behavior modeling allows the simulation of materials under a wide range of external influence, including low and high temperature and other environmental factors, almost without any faults.

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World Journal of Engineering, vol. 9 no. 3
Type: Research Article
ISSN: 1708-5284

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