用一种改进的Monte Carlo potts模型二维模拟了陶瓷烧结过程中显微组织的演化,在改进模型中使用了Tikare等提出的空位湮灭算法来模拟致密化过程。结果表明,改进的Monte Carlo potts模型可以模拟固相和空位的扩散过程,很好地再现了陶瓷...用一种改进的Monte Carlo potts模型二维模拟了陶瓷烧结过程中显微组织的演化,在改进模型中使用了Tikare等提出的空位湮灭算法来模拟致密化过程。结果表明,改进的Monte Carlo potts模型可以模拟固相和空位的扩散过程,很好地再现了陶瓷烧结过程中显微组织的演化和致密化过程。同时研究了晶界迁移率和空位湮灭概率对烧结致密化过程的影响。展开更多
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
This paper examines the selection and performance evaluation of a variety of piezoelectric materials for cantilever-based sensor applications.The finite element analysis method is implemented to evaluate the relative ...This paper examines the selection and performance evaluation of a variety of piezoelectric materials for cantilever-based sensor applications.The finite element analysis method is implemented to evaluate the relative importance of materials properties such as Young's Modulus(E),piezoelectric stress constants(e_(31)),dielectric constant(ε)and Poisson's ratio(ν)for cantilever-based sensor applications.An analytic hierarchy process(AHP)is used to assign weights to the properties that are studied for the sensor structure under study.A technique for order preference by similarity to ideal solution(TOPSIS)is used to rank the performance of the piezoelectric materials in the context of sensor voltage outputs.The ranking achieved by the TOPSIS analysis is in good agreement with the results obtained from finite element method simulation.The numerical simulations show that K_(0.5)Na_(0.5)NbO_(3)-LiSbO_(3)(KNN-LS)materials family is important for sensor application.Young's modulus(E)is most influencing material's property followed by piezoelectric constant(e_(31)),dielectric constant(ε)and Poisson's ratio(ν)for cantilever-based piezoelectric sensor applications.展开更多
文摘用一种改进的Monte Carlo potts模型二维模拟了陶瓷烧结过程中显微组织的演化,在改进模型中使用了Tikare等提出的空位湮灭算法来模拟致密化过程。结果表明,改进的Monte Carlo potts模型可以模拟固相和空位的扩散过程,很好地再现了陶瓷烧结过程中显微组织的演化和致密化过程。同时研究了晶界迁移率和空位湮灭概率对烧结致密化过程的影响。
基金the Projects Nos. III.23.2.3 (I.S. Konovalenko, S.P. Buyakova) and III.23.2.4 (S.G. Psakhie) of the Basic Scientific Research Program of State Academies of Sciences for 2013e2020the RFBR Project No. 12-01-00805-a (A.Yu. Smolin, E.V. Shilko)the grant No. 14-19-00718 of the Russian Science Foundation (A.Yu. Smolin, E.V. Shilko, S.V. Astafurov)
文摘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.
文摘This paper examines the selection and performance evaluation of a variety of piezoelectric materials for cantilever-based sensor applications.The finite element analysis method is implemented to evaluate the relative importance of materials properties such as Young's Modulus(E),piezoelectric stress constants(e_(31)),dielectric constant(ε)and Poisson's ratio(ν)for cantilever-based sensor applications.An analytic hierarchy process(AHP)is used to assign weights to the properties that are studied for the sensor structure under study.A technique for order preference by similarity to ideal solution(TOPSIS)is used to rank the performance of the piezoelectric materials in the context of sensor voltage outputs.The ranking achieved by the TOPSIS analysis is in good agreement with the results obtained from finite element method simulation.The numerical simulations show that K_(0.5)Na_(0.5)NbO_(3)-LiSbO_(3)(KNN-LS)materials family is important for sensor application.Young's modulus(E)is most influencing material's property followed by piezoelectric constant(e_(31)),dielectric constant(ε)and Poisson's ratio(ν)for cantilever-based piezoelectric sensor applications.
