| 个人简介 | |
|---|---|
 Prof. Sergei Alexandrov Beihang University, China |
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| 标题： Ideal Flow Theory for Metal Forming Design | |
| 摘要： Ideal flows have been defined elsewhere as solenoidal smooth deformations in which an eigenvector field associated everywhere with the greatest principal strain rate is fixed in the material. Under such conditions all material elements undergo paths of minimum plastic work, a condition which is advantageous for metal forming processes. The ideal flow theory has been used as the basis of a procedure for the preliminary design of such processes. In particular, the distribution of strain and material properties is uniform in the final product of steady processes. The ideal flow theory has been long associated with the Tresca yield criterion and its associated flow rule. The objective of the present paper is to extend this theory to the double shearing model and the double slip and rotation model that are widely adopted in pressure – dependent plasticity. Both steady and nonsteady processes under splane strain and axial symmetry conditions are considered. Efficient numerical approaches for design of metal forming processes are developed. The approaches are based on the method of characteristics. In the case of plane strain problems, the original system of equations reduces to the equation of telegraphy and subsequent numerical integration. | |
| 简介： Sergei Alexandrov is a Visiting Professor at Beihang University (Beijing, China) under the program “Recruitment Program for Global Experts” (“1000 Talent Plan”) and a Research Professor at the Laboratory for Technological Processes of the Institute for Problems in Mechanics of the Russian Academy of Sciences. He received his Ph.D. in Physics and Mathematics in 1990 and D.Sc. in Physics and Mathematics in 1994. He worked as a Professor at Moscow Aviation Technology Technical University (Russia), a Visiting Scientist at ALCOA Technical Center (USA), GKSS Research Centre (Germany) and Seoul National University (South Korea), and was a Visiting Professor at Aveiro University (Portugal), University of Besancon (France) and Technical University of Malaysia (Malaysia). He is a member of the Russian National Committee on Theoretical and Applied Mechanics. Sergei Alexandrov has published more than 400 papers in journals, books and conference proceedings, including three monographs and around 200 papers in journals indexed in the Web of Science. He has participated in the scientific committee of several international conferences and served as a reviewer in a wide range of international journals. He is on the editorial board of several journals including Continuum Mechanics and Thermodynamics (Springer) and Structural Engineering and Mechanics (Technopress). His research areas are plasticity theory, fracture mechanics, and their applications to metal forming and structural mechanics. | |
