By making use of the analogy between the network quantities and the electromagnetic fields, a numerical method is employed to investigate the possible topographic effect in the earth's EM fields for several simple models in two dimensional problems. It is found that various topographies may give rise to distortions in the earth's EM fields, and some EM anomalies observed on the ground surface may be simply due to such a topographic effect.Pour etudier les effets possibles de la topographie sur les champs Clectromagnetiques terrestres, pour des modeles simples en deux dimensions, on utilise une rnethode numerique basee sur l'analogie entre les valeurs du reseau et les champs electromagnetiques. On decouvre que diverses topographies peuvent produire des distortions dans les champs Clectromagni.tiques terrestres et que certaines anomalies Clectromagnetiques obsemees a la surface peuvent resulter de tels effets topographiques.[Traduit par le journal]
Multi-pass shape rolling is performed to produce long products of arbitrary cross-sectional shapes. In the past, the multipass shape rolling process has been designed by the trial and error method or the experience of experts based on the empirical approach. Particularly, the design of roll caliber in shape rolling is important to improve product quality and dimensional accuracy. In this paper, the caliber design and pass schedule of multi-pass shape rolling were proposed for manufacturing piston ring wire. In order to design roll caliber, major shape parameter and dimension was determined by analysis of various caliber design. FE-simulation was conducted to verify effectiveness of proposed process design. At first, forming simulation was performed to predict shape of the product. Then, fracture of the wire was evaluated by critical damage value using normalized Cockcroft-Latham criteria. The experiment was carried out and the results are within the allowable tolerance.
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