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Effect of Pulse Current GMAW on the Yield Stress of the S460M TMCP Steel Welded Joints
A. Zavdoveev,P. Zok,V. Pozniakov,M. Rogante,T. Baudin,M. Heaton,A. Gaivoronskiy,S. Zhdanov,P. Acquier,T. Solomijchuk,V. Kostin,M. Skoryk,I. Klochkov,S. Motrunich 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.3
Thermomechanically cold processed (TMCP) steels with a high level of strength are actively used in various constructions. The high strength of the TMCP steels is acquired due to the formation of the fine-grained structure. Such steels have relativelylow carbon percentage. These greatly simplify the solution of the problem of improving the quality and reliability of metalstructures. At the same time this raises new questions in terms of the technology for welding such steels. In the first instance,it is conditioned by the complex behavior of the TMCP structure under the welding thermal cycle effect. The most importantproperty of the welded joint is yield stress (YS) which characterizes the workability of the whole joint. The estimation ofthe YS while developing the welding technology is a valuable task for design. This current research has made a complexinvestigation of the modern welding technique's effect on the behavior of the yield stress formation in TMCP steel weldedjoints. For progressive technology development, pulse arc welding was used.
A. Zavdoveev,P. Zok,V. Pozniakov,M. Rogante,T. Baudin,M. Heaton,A. Gaivoronskiy,S. Zhdanov,P. Acquier,T. Solomijchuk,V. Kostin1,M. Skoryk,I. Klochkov,S. Motrunich 대한금속ᆞ재료학회 2023 METALS AND MATERIALS International Vol.29 No.2
Thermomechanically cold processed (TMCP) steels with a high level of strength are actively used in various constructions. The high strength of the TMCP steels is acquired due to the formation of the fine-grained structure. Such steels have relativelylow carbon percentage. These greatly simplify the solution of the problem of improving the quality and reliability of metalstructures. At the same time this raises new questions in terms of the technology for welding such steels. In the first instance,it is conditioned by the complex behavior of the TMCP structure under the welding thermal cycle effect. The most importantproperty of the welded joint is yield stress (YS) which characterizes the workability of the whole joint. The estimation ofthe YS while developing the welding technology is a valuable task for design. This current research has made a complexinvestigation of the modern welding technique's effect on the behavior of the yield stress formation in TMCP steel weldedjoints. For progressive technology development, pulse arc welding was used.
1차원 이외의 배경 전기전도도 구조에서 근사 적분방정식을 이용한 3차원 전자탐사 모델링
이성곤,Michael S. Zhdanov 한국지구물리탐사학회 2005 지구물리와 물리탐사 Vol.8 No.3
이 연구에서는 배경 전기전도도 구조가 1차원 층서구조가 아닌 경우에도 적분방정식법을 이용하여 비교적 정확히 모델링 할 수 있는 근사적 방법에 대한 유도 과정을 제시하였으며, 이를 기반으로 전자탐사 수치 모델링을 구현하여 그 정확도 및 효율성에 대해 고찰하였다. 이 연구에서 제시된 방법은 통상적인 적분방정식법과 마찬가지로 1차원 층서구조에서의 Green 함수를 그대로 이용할 수 있어 계산 측면에서 매우 효율적이며, 대체적으로 적분방정식을 구성하기 위한 행렬의 크기를 줄일 수 있다. 본 연구에서 개발된 근사 적분방정식 알고리듬을 간단한 수치 모델에 대하여 적용한 결과 정확도는 반응을 구하고자 하는 이상체 부근에서는 거의 차이가 없었으며, 또한 계산 시간에 대한 분석을 통해 이 모델링 알고리듬을 이용하여 역산을 수행하고자 할 때 계산 시간을 대폭 감소시킬 수 있음을 확인하였다. 본 연구에서 제안된 방법은 1차원 층서구조가 아닌 이미 알려진 공통된 구조를 갖는 여러 지질 모델에 대한 전자탐사 반응을 매우 효율적으로 구할 수 있을 것으로 판단된다.
상전장,Ueda, Takumi,Zhdanov, Michael S. Korean Society of Earth and Exploration Geophysici 2008 지구물리와 물리탐사 Vol.11 No.1
In this paper we consider an application of the method of electromagnetic (EM) migration to the interpretation of a typical marine controlled-source (MCSEM) survey consisting of a set of sea-bottom receivers and a moving electrical bipole transmitter. Three-dimensional interpretation of MCSEM data is a very challenging problem because of the enormous number of computations required in the case of the multi-transmitter and multi-receiver data acquisition systems used in these surveys. At the same time, we demonstrate that the MCSEM surveys with their dense system of transmitters and receivers are extremely well suited for application of the migration method. In order to speed up the computation of the migration field, we apply a fast form of integral equation (IE) solution based on the multigrid quasi-linear (MGQL) approximation which we have developed. The principles of migration imaging formulated in this paper are tested on a typical model of a sea-bottom petroleum reservoir.
PYF: Predictions of Fragment Mass Yields for Transmutation of Minor Actinides
D. M. Gorodisskiy,K. V. Kovalchuk,,S. I. Mulgin,A. Ya Rusanov,S. V. Zhdanov 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A new code PYF for calculating relative mass yields of primary and finalfragments from 5 - 200 MeV proton and neutron induced fission of target nucleiTh-Bk is proposed. The calculation algorithm is based on the effects ofisotopic quasi-invariance of fragment charge distributions from asymmetricfission of actinide nuclei at excitation energies above 12 MeV. Predictionsof the PYF have been successfully compared to a wide set of experimentaldata. The predictive power of the PYF shows that it can be used as a basisfor calculating the neutron-induced fission product yields in the interestsof the transmutation of minor actinides in the Accelerator-Driven Systemsand for other practical applications.
Computer modeling of a multi-run growth technique for sapphire ribbons
A.V.Borodin,V.A.Borodin,A.V.Zhdanov,I.S.Petkov 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.2
Multi-run growth is most commonly applied to provide a high yield of shaped crystals. The presence of several crystals in a melting zone and a radiative heat exchange between them pose difficulties in the optimization of the heat zone design and growth conditions. The trial-and-error experiments can hardly be applied because of high cost in terms of materials and time. Moreover, the presence of many parameters under consideration and their interaction make a tentative search a very arduous task. In this paper, the multi-run growth process for sapphire ribbons is studied on the basis of mathematical modeling and the optimized relationships are found.