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Unders.anding the mechanis.s.of friction s.ir welding bas.d on computer s.mulation us.ng particles

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Defence Technology（防务技术） 2018年第6期14卷 643-656页

作者： A.yu.smolin E.V.s.ilko s.V.As.afurov E.A.Kolubaev g.M.Eremina s.g.psakhie Ins.itute of s.rength Phys.cs.and Materials.s.ience s. RAs Tomsk634055Russia Toms. s.ate Univers.ty Tomsk634050Russia s.olkovo Ins.itute of s.ience and Technology Skolkovo143025Russia

Friction s.ir welding(Fs.) is.a novel technique for joining different materials.without melting. In Fs. the welded components.are joined by s.irring the plas.icized material of the welded edges.with a s.ecial rotating pin plunged into the material and moving along the joint line. From the s.ientific point of view,the key role of the Fs. proces.es.belongs.to formation of the s.ecial plas.icized conditions.and activation of phys.cal mechanis.s.of mixing the materials.in s.ch conditions.to produce the s.rong homogeneous.weld. But it is.s.ill a lack of complete unders.anding of what are thes. conditions.and *** paper is.devoted to unders.anding the mechanis.s.of material mixing in conditions.of Fs. bas.d on a computer s.mulation us.ng particles. The movable cellular automaton method(MCA), which is.a repres.ntative of the particle methods.in mechanics.of materials. was.us.d to perform all ***, material flow including material s.irring in Fs. is.s.mulated us.ng computational fluid mechanics.or s.oothed particle hydrodynamics. which as.ume that the material is.a continuum and does.not take into account the material s.ructure. MCA cons.ders.a material as.an ens.mble of bonded particles. Breaking of inter-particle bonds.and formation of new bonds.enables.s.mulation of crack nucleation and healing, as.well as.mas. mixing and *** paper cons.s.s.of two main parts. In the firs. part, the s.mulations.in 2 D s.atements.are performed to s.udy the dynamics.of friction s.ir welding of duralumin plates.and influence of different welding regimes.on the features.of the material s.irring and temperature dis.ribution in the forming welded joints. It is.s.own that the ratio of the rotational s.eed to the advancing velocity of the tool has.a dramatic effect on the joint quality. A s.itable choice of thes. parameters.combined with additional ultras.nic impact could cons.derably reduce the number of pores.and microcracks.in the weld without s.gnifica

关键词： Friction s.ir welding Plas.ic flow Deformation mechanis.s s.mulation Particle method

Dis.ipation of s.litary Waves.in Aluminum with grain Boundary

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Journal of Materials.s.ience & Technology 1998年第5期14卷 475-477页

作者： psakhie, s.g. Zolnikov, K.P. s.raev, D.yu. Ins.itute of s.rength Phys.cs.and Materials.s.ience Russian Academy of Sciences Siberian Branch Akademicheskii pr.2/1 634021 Tomsk Russian Federation

The behavior of pas.ing s.litary waves.through the region of grain boundary has.been inves.igated on the bas.s.of the molecular dynamics.method. It has.been s.own that s.litary waves.initiated by compres.ion and s.ear loading have a different interaction with the grain boundary region. The pos.ibilities.of us.ng s.litary waves.for nondes.ructive tes.ing of materials. in particular, for tes.ing the quality of coatings. for tes.ing of accumulation of microdamages. etc. have been noted. (Edited author abs.ract) 5 Refs.

关键词： Aluminum

Modeling mechanical behaviors.of compos.tes.with various.ratios.of matrixeinclus.on properties.us.ng movable cellular automaton method

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Defence Technology（防务技术） 2015年第1期11卷 18-34页

作者： A.yu.smolin E.V.s.ILKO s.V.As.AFUROV I.s.KONOVALENKO s.P.BUYAKOVA s.g.psakhie Ins.itute of s.rength Phys.cs.and Materials.s.ience s. RAs Toms. s.ate Univers.ty Ins.itute of High Technology Phys.cs Tomsk Polytechnic University s.olkovo Ins.itute of s.ience and Technology

Two clas.es.of compos.te materials.are cons.dered: clas.ical metaleceramic compos.tes.with reinforcing hard inclus.ons.as.well as.hard ceramics.matrix with s.ft gel inclus.ons. Movable cellular automaton method is.us.d for modeling the mechanical behaviors.of s.ch different heterogeneous.materials. The method is.bas.d on particle approach and may be cons.dered as.a kind of dis.rete element method. The main feature of the method is.the us. of many-body forces.of inter-element interaction within the formalis. of s.mply deformable element approximation. It was.s.own that the s.rength of reinforcing particles.and the width of particle-binder interphas. boundaries.had determining influence on the s.rvice characteris.ics.of metaleceramic compos.te. In particular, the increas.ng of s.rength of carbide inclus.ons.may lead to s.gnificant increas. in the s.rength and ultimate s.rain of compos.te material. On the example of porous.zirconia ceramics.it was.s.own that the change in the mechanical properties.of pore s.rface leads.to the corres.onding change in effective elas.ic modulus.and s.rength limit of the ceramic s.mple. The les. is.the pore s.ze, the more is.this.effect. The increas. in the elas.ic properties.of pore s.rface of ceramics.may reduce its.fracture energy.

关键词： Compos.tes Metal ceramics Zirconia ceramics gel Modeling Movable cellular automata Many-body interaction

Electron-beam Treatment of Tungs.en-free TiC/NiCr CermetⅡ: s.ructural Trans.ormations.in the s.bs.rface Layer

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Journal of Materials.s.ience & Technology 2006年第4期22卷 511-513页

作者： Baohai yu V.E.Ovcharenko s.g.psakhie O.V.Laps.in Ins.itute of Metal Res.arch Chinese Academy of Sciences Shenyang 110016 China Ins.itute of s.rength Phys.cs.and Materials.s.ience Siberia Branch Russian Academy of Sciences Russia

The character of s.ructural changes.in the s.rface layer of titanium carbide （TiC） with Ni-Cr alloy binder was.inves.igated theoretically and experimentally after electron-beam treatment of the material s.rface. The thermal influence of the electron-beam irradiation on the s.rface layer micros.ructure of the compos.te fine-grained material was.mathematically analyzed. Quantitative es.imations.of the depth of the zone in micros.ructural phas. trans.ormations.were carried out. The micros.ructure and concentration profile of Ti dis.ribution in the metallic binder over the cros. s.ction of the s.rface layer with micros.ructural phas. trans.ormations.after electron-puls. treatment of the hard metal s.rface were experimentally inves.igated.

关键词： Cermets TiC/NiCr Electron-beam treatment s.ructural trans.ormation

Computer s.mulation of Plas.ic Deformation in grainBoundary Region under High Rate Loading

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Journal of Materials.s.ience & Technology 1996年第3期12卷 235-237页

作者： K.P.Zolnikov s.g.psakhie s.I.Negrs.ul and s. yu.Koros.elev (Ins.itute of s.rength Phys.cs.and Materials.s.ience, Rus.ian Academy of s.cences. s.berian Branch,Akademiches.ii pr.2/1, 634048 Toms., Rus.ia)(To whom corres.ondence s.ould be addres.ed) Ins.itute of s.rength Phys.cs.and Materials.s.ience Russian Academy of Sicences Siberian Branch Akademicheskii pr.2/1 634048 Tomsk Russian Federation

The computer s.mulation of Al three-dimens.onal crys.allite containing grain boundary of s.ecial type was.carried out and its.behaviour under high rate loading was.inves.igated. The molecular dynamics.method was.us.d and interaction betwen atoms.was.des.ribed bas.d on ps.udopotential method. Vortical character of the atom movements.in the grain boundary region is.realized under s.ear loading in certain directions. Back and forth movements.of atoms.in the direction which is.perpendicular to the s.ear als. aris.. Amplitude of s.ch movements.is.approximately equal to an interplanar dis.ance in this.direction.

关键词： s.mulation Computer s.mulation of Plas.ic Deformation in grainBoundary Region under High Rate Loading

Hot s.ot in Materials.with s.ructural Defects.under High s.ear Loading Rates

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Journal of Materials.s.ience & Technology 1998年第1期14卷 72-74页

作者： s. g.psakhie K.P.Zolnikov and D. yu.s.raev (Ins.itute of s.rength Phys.cs.and Materials.s.ience, Rus.ian Academy of s.iences. s.berian Branch,Akademiches.ii pr.2/1, 634021 Toms., Rus.ia) Ins.itute of s.rength Phys.cs.and Materials.s.ience Russian Academy of Sciences Siberian Branch Akademicheskii pr.2/1 634021 Tomsk Russian Federation

The res.ons. of three-dimens.onal s.mple of Al, containing vacancy complex, under s.ear loading was.s.mulated. The molecular dynamics.method was.us.d and interaction between atoms.was.des.ribed on the bas. of ps.udopotential theory s.litary waves.were generated in the s.mple under mechanical loading. Their interaction with the vacancy complexes.was.s.own to be able to initiate hot s.ot in that local region of the complexes. s.me parameters.of the hot s.ot as.well as.s.litary waves.were calculated. The initiation of the hot s.ot is.accompanied with s.fficient local s.ructural relaxation.

关键词： Rev Hot s.ot in Materials.with s.ructural Defects.under High s.ear Loading Rates

Nucleation of dis.ocations.and twins.in fcc nanocrys.als. Dynamics.of s.ructural trans.ormations

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Journal of Materials.s.ience & Technology 2019年第1期35卷 201-206页

作者： Aleks.ndr V.Korchuganov Aleks.ndr N.Tyuments.v Kons.antin P.Zolnikov Igor yu.Litovchenko Dmitrij s.Kryzhevich Elazar gutmanas.s.ouxin Li Zhongguang Wang s.rgey g.psakhie Ins.itute of s.rength Phys.cs.and Materials.s.ience of s.berian Branch of Rus.ian Academy of s.iences National Res.arch Toms. s.ate Univers.ty Technion–Is.ael Ins.itute of Technology s.enyang National Laboratory for Materials.s.ience Institute of Metal Research Chinese Academy of Sciences

This.paper reports.on a molecular dynamics.s.udy of s.ructural rearrangements.in a copper nanocrys.al during nucleation of plas.ic deformation under uniaxial tens.on. The s.udy s.ows.that the res.lting nucleation of partial dis.ocations.on the free s.rface and their glide occurs.through local fcc→bcc→hcp trans.ormations.via cons.s.ent atomic dis.lacements. We propos. an atomic model for the generation of dis.ocations.and twins.bas.d on local revers.ble fcc→bcc→fcc trans.ormations. with the revers. one proceeding through an alternative s.s.em. The model gives.an ins.ght into pos.ible caus.s.and mechanis.s.of the generation of partial dis.ocations.and mechanical twins.in two and more adjacent planes.of plas.ically deformed nanocrys.als. The obtained data allow a better unders.anding of how plas.icity is.generated in nanos.ructured materials.

关键词： Lattice defects Dis.ocation Nanotwin Atomic model Molecular dynamics s.mulations

About Nonlinear Mechanis. of Energy Trans.ormation at Ion Implantation

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Journal of Materials.s.ience & Technology 1999年第6期15卷 581-582页

作者： s.g.psakhie, K.P.Zolnikov, R.I.Kadyrov, g.E.Rudens.ii, s.A.Vas.iliev and yu.P.s.atheev (Ins.itute of s.rength Phys.cs.and Materials.s.ience, Rus.ian Academy of s.iences. s.berian Branch, Toms., Rus.ia) Ins.itute of s.rength Phys.cs.and Materials.s.ience Russian Academy of Sciences Siberian Branch Tomsk Russian Federation

The peculiarities.of energy dis.ipation trans.erred by s.litary waves.on defects.s.ch as.frees.rface, grain boundary, region with high concentration of vacancies.are s.udied. One of theways.of des.ription of the long ... 详细信息

关键词： About Nonlinear Mechanis. of Energy Trans.ormation at Ion Implantation