• Title, Summary, Keyword: 트레스카 응력

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Contact Characteristic and Stress Analysis of Wheel-Rail for Rolling Stock (철도차량용 휠과 레일의 접촉특성 및 응력 해석)

  • Sung, Ki-Deug;Yang, Won-Ho;Cho, Myoung-Rae;Kim, Cheol
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.5
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    • pp.148-156
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    • 2000
  • In this paper, we investigate contact characteristic of wheel-rail interface for rolling stock using the finite element method. Contact stress distribution due to the rail mounting slope is obtained in order to reduce the contact stress. Stress analysis of the rail, firstly, is performed one subjected to elliptical pressure based on Hertz theory. Secondly, we perform stress analysis of the rail subjected to contact stress obtained by this study. Results for the maximum shear stress, its location and the principal shear stress distribution are compared.

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Simulation of Explosion Using the Ideal Viscoelastic Object Yield Condition (이상적인 점탄성체 항복 조건을 이용한 폭발 시뮬레이션)

  • Sung, Su-Kyung;Kim, Gyeong-Su;Shin, Byeong-Seok
    • Journal of Korea Game Society
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    • v.14 no.6
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    • pp.49-58
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    • 2014
  • In particle-based fluid simulation, the yield stress is required for the deformation of the viscoelastic material like gel. von Mises's yield condition has been proposed to implement deformation of viscoelastic objects, but did not express the explosion. Furthermore, von Mises's yield condition is hard to approximate. We propose an ideal yield condition for viscoelastic object that reference from Tresca's yield condition. Unlike conventional particle-based simulation approximate the external power by the deformed length of the object, this paper is approximate the external power by area of the object. We check up that explosion was realistic when a viscoelastic object is compressed under the ideal yield condition.

Structural Analysis for Design of Anchor Straps for a Large-Scale LNG Storage Tank with Corner Protection and Inner Tank (코너프로텍션과 내조를 고려한 대용량 LNG 저장탱크 앵커스트랩의 구조설계를 위한 유한요소해석)

  • Jin, Chengzhu;Ha, Sung-Kyu;Kim, Seong-Jong;Lee, Young-Hwan
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.12
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    • pp.1543-1548
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    • 2011
  • Structural analysis is performed to design anchor straps for a large-scale-liquefied-natural-gas (LNG) storage tank with corner protection and an inner tank by considering structural integrity. Anchor straps made of 9% nickel steel are attached to the inner tank, corner protection, and concrete raft to prevent the failure of the inner tank during both normal and emergency operating conditions. Two finite element (FE) models were analyzed in this study. One is a stand-alone model of the anchor strap, while the other is an extended model of the substructure of the anchor strap, inner tank, and corner protection. Three-dimensional shell elements are used to effectively assess the bending and axial behavior of structures. The Tresca stress values in each part of the two models are calculated for operation under five different load-condition cases: normal operation, leakage of the LNG, hydro test, and two earthquake conditions.