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模拟长杆弹侵彻混凝土靶的MCA方法 被引量:11
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作者 陈克 黄德武 s.g.psakhie 《爆炸与冲击》 EI CAS CSCD 北大核心 2004年第2期127-132,共6页
采用改进的移动元胞自动机法数值软件,对长杆弹侵彻混凝土靶进行了二维数值模拟,给出了弹靶的破坏变形过程,得到了侵彻深度与冲击速度的关系曲线。数值模拟结果与已有的实验现象吻合较好,说明该计算方法可以有效地计算和模拟高速侵彻问题。
关键词 混凝土靶 冲击速度 侵彻深度 数值模拟 长杆弹 移动元胞自动机法
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Electron-beam Treatment of Tungsten-free TiC/NiCr Cermet Ⅰ:Influence of Subsurface Layer Microstructure on Resistance to Wear during Cutting of Metals 被引量:3
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作者 V.E.Ovcharenko BaohaiYU s.g.psakhie 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2005年第3期427-429,共3页
An experimental investigation were performed on the effect of the impulse electron-beam irradiation upon microstruc-ture of the surface layer and on wear resistance of a cutting tool for sintered TiC/NiCr cermet. The ... An experimental investigation were performed on the effect of the impulse electron-beam irradiation upon microstruc-ture of the surface layer and on wear resistance of a cutting tool for sintered TiC/NiCr cermet. The results showed that the surface electron-beam treatment of the TiC/NiCr cermet is an efficient method for investigating the mi-crostructure and phase composition in the surface layer of the powder composite and there are optimal regimes of electron-beam treatment, which ensure a substantial increase in the resistance of the cermet to wear during cutting of metals. 展开更多
关键词 CERMET TiC/NiCr Electron-beam treatment MICROSTRUCTURE Wear resistance
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Electron-beam Treatment of Tungsten-free TiC/NiCr CermetⅡ: Structural Transformations in the Subsurface Layer 被引量:3
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作者 Baohai YU V.E.Ovcharenko +1 位作者 s.g.psakhie O.V.Lapshin 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2006年第4期511-513,共3页
The character of structural changes in the surface layer of titanium carbide (TiC) with Ni-Cr alloy binder was investigated theoretically and experimentally after electron-beam treatment of the material surface. The... The character of structural changes in the surface layer of titanium carbide (TiC) with Ni-Cr alloy binder was investigated theoretically and experimentally after electron-beam treatment of the material surface. The thermal influence of the electron-beam irradiation on the surface layer microstructure of the composite fine-grained material was mathematically analyzed. Quantitative estimations of the depth of the zone in microstructural phase transformations were carried out. The microstructure and concentration profile of Ti distribution in the metallic binder over the cross section of the surface layer with microstructural phase transformations after electron-pulse treatment of the hard metal surface were experimentally investigated. 展开更多
关键词 Cermets TiC/NiCr Electron-beam treatment Structural transformation
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Inspection of aluminum alloys by a multi-frequency eddy current method 被引量:1
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作者 A.V.EGOROV V.V.POLYAKOV +4 位作者 D.S.SALITA E.A.KOLUBAEV s.g.psakhie A.G.CHERNYAVSKII I.V.VOROBEI 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2015年第2期99-103,共5页
The paper proposes an experimental method of material inspection,which is based on digital processing of multi-frequency eddy current measurement data.The influences of various factors(conductivity,the gap between the... The paper proposes an experimental method of material inspection,which is based on digital processing of multi-frequency eddy current measurement data.The influences of various factors(conductivity,the gap between the sample surface and the sensor,the thickness of the sample) on the obtained hodographs are examined by taking the aluminum alloys for example,and the possibility of separation of various factors is analyzed.The results obtained are indicative of how much promise the proposed method offers for the inspection and testing of products made of aluminum alloys. 展开更多
关键词 铝合金 涡流法 检查 多频 数字处理 测量数据 电导率 传感器
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Modeling mechanical behaviors of composites with various ratios of matrixeinclusion properties using movable cellular automaton method
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作者 A.Yu.SMOLIN E.V.SHILKO +3 位作者 S.V.ASTAFUROV I.S.KONOVALENKO S.P.BUYAKOVA s.g.psakhie 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2015年第1期18-34,共17页
Two classes of composite materials are considered: classical metaleceramic composites with reinforcing hard inclusions as well as hard ceramics matrix with soft gel inclusions. Movable cellular automaton method is use... Two classes of composite materials are considered: classical metaleceramic composites with reinforcing hard inclusions as well as hard ceramics matrix with soft gel inclusions. Movable cellular automaton method is used for modeling the mechanical behaviors of such different heterogeneous materials. The method is based on particle approach and may be considered as a kind of discrete element method. The main feature of the method is the use of many-body forces of inter-element interaction within the formalism of simply deformable element approximation. It was shown that the strength of reinforcing particles and the width of particle-binder interphase boundaries had determining influence on the service characteristics of metaleceramic composite. In particular, the increasing of strength of carbide inclusions may lead to significant increase in the strength and ultimate strain of composite material. On the example of porous zirconia ceramics it was shown that the change in the mechanical properties of pore surface leads to the corresponding change in effective elastic modulus and strength limit of the ceramic sample. The less is the pore size, the more is this effect. The increase in the elastic properties of pore surface of ceramics may reduce its fracture energy. 展开更多
关键词 COMPOSITES Metal CERAMICS ZIRCONIA CERAMICS Gel MODELING Movable cellular AUTOMATA MANY-BODY interaction
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Understanding the mechanisms of friction stir welding based on computer simulation using particles
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作者 A.Yu.Smolin E.V.Shilko +3 位作者 S.V.Astafurov E.A.Kolubaev G.M.Eremina s.g.psakhie 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2018年第6期643-656,共14页
Friction stir welding(FSW) is a novel technique for joining different materials without melting. In FSW the welded components are joined by stirring the plasticized material of the welded edges with a special rotating... Friction stir welding(FSW) is a novel technique for joining different materials without melting. In FSW the welded components are joined by stirring the plasticized material of the welded edges with a special rotating pin plunged into the material and moving along the joint line. From the scientific point of view,the key role of the FSW processes belongs to formation of the special plasticized conditions and activation of physical mechanisms of mixing the materials in such conditions to produce the strong homogeneous weld. But it is still a lack of complete understanding of what are these conditions and mechanisms.This paper is devoted to understanding the mechanisms of material mixing in conditions of FSW based on a computer simulation using particles. The movable cellular automaton method(MCA), which is a representative of the particle methods in mechanics of materials, was used to perform all computations.Usually, material flow including material stirring in FSW is simulated using computational fluid mechanics or smoothed particle hydrodynamics, which assume that the material is a continuum and does not take into account the material structure. MCA considers a material as an ensemble of bonded particles. Breaking of inter-particle bonds and formation of new bonds enables simulation of crack nucleation and healing, as well as mass mixing and micro-welding.The paper consists of two main parts. In the first part, the simulations in 2 D statements are performed to study the dynamics of friction stir welding of duralumin plates and influence of different welding regimes on the features of the material stirring and temperature distribution in the forming welded joints. It is shown that the ratio of the rotational speed to the advancing velocity of the tool has a dramatic effect on the joint quality. A suitable choice of these parameters combined with additional ultrasonic impact could considerably reduce the number of pores and microcracks in the weld without significant overheating of the welded materials.The second part of the paper considers simulation in the 3 D statement. These simulations showed that using tool pins of different shape like a cylinder, cone, or pyramid without a shoulder results in negligible motion of the plasticized material in the direction of workpiece thickness. However, the optimal ratio of the advancing velocity to the rotational speed allows transporting of the stirred material around the tool pin several times and hence producing the joint of good quality. 展开更多
关键词 FRICTION STIR WELDING PLASTIC flow Deformation MECHANISMS Simulation Particle method
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Computer Simulation of Plastic Deformation in GrainBoundary Region under High Rate Loading
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作者 K.P.Zolnikov s.g.psakhie S-I.Negrskul and S. Yu.Korostelev (Institute of Strength Physics and Materials Science, Russian Academy of Sicences, Siberian Branch,Akademicheskii pr.2/1, 634048 Tomsk, Russia)(To whom correspondence should be addressed) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1996年第3期235-237,共3页
The computer simulation of Al three-dimensional crystallite containing grain boundary of special type was carried out and its behaviour under high rate loading was investigated. The molecular dynamics method was used ... The computer simulation of Al three-dimensional crystallite containing grain boundary of special type was carried out and its behaviour under high rate loading was investigated. The molecular dynamics method was used and interaction betwen atoms was described based on pseudopotential method. Vortical character of the atom movements in the grain boundary region is realized under shear loading in certain directions. Back and forth movements of atoms in the direction which is perpendicular to the shear also arise. Amplitude of such movements is approximately equal to an interplanar distance in this direction. 展开更多
关键词 SIMULATION Computer Simulation of Plastic Deformation in GrainBoundary Region under High Rate Loading
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