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Improved workability using preheating in the electromagnetic forming process
탁승민,강한빈,백인석,이석순 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.6
Electromagnetic forming (EMF) is a high-speed method used to shape metals using a high-energy magnetic field generated by a forming coil. In this study, EMF experiments were conducted on heat-treated aluminum pipes in an attempt to improve the workability of the metal, in which the heating temperature was varied. Heating to 200 °C and 250 °C resulted in deformation displacements of 1 and 5 mm, respectively. Coupled EM–structural numerical analyses revealed that the EM force was lower by 16 % after heating at 250 °C due to the reduction in the conductivity of aluminum at higher temperatures, resulting in a higher resistance. However, the flow stress decreased by about 50 % at 250 °C. Thus, the increase in displacement despite the reduction in the EM force at higher temperatures indicates that the workability of metals during EMF can be improved with preheating.
외부 마찰열에 의한 내부 관성측정장치의 과도 열전달 해석
탁승민,박지원,강민규,박동진,이종수,이석순,Tak, Seungmin,Park, Jiwon,Kang, Minkyu,Park, Dongjin,Lee, Jongsu,Lee, Seoksoon 항공우주시스템공학회 2010 항공우주시스템공학회지 Vol.4 No.1
Guided weapon is very excellent strategy system than conventional weapons. Recently, several devices and a technology developed much developing more, inertia measuring device is one example. Inertia measuring device is device that is used to improe more accuracy of guided weapon, this device is operated by sensors of inside. Sensors of inside are parts that is very sensitive about impact or shock, heat that interact when shoot, it is main purpose that verify durability of sensor by heat delivered from outside in this study.
Wire Rope의 등가모델을 위해 이방성 탄성계수 적용에 대한 연구
탁승민(Seung-Min Tak),강민규(Min-kyu Kang),박동진(Dong-Jin Park),이계광,이석순(Seok-Soon Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Wire rope made of twisted wire is a mechanical elements. And Composed of single or multi-layer strands. It has high Axle strength to weight but small resistance for bending. Wire ropes are widely used in offshore, suspension bridge and elevator, etc. It is difficult to find out the characteristics of a strand or wire rope because of complicated geometry and contact condition. therefore, analytical method than the simple way is needed. In this study, Equivalent model has the same radius of the wire rope. and it has a modulus of orthogonal anisotropy. Tensile & 3 point bending analysis done to compare the results. Strong point that is widely used with wire rope in offshore. and applies equivalent model to strong point and verify the verified.