한국농공학회지 (Magazine of the Korean Society of Agricultural Engineers)

한국농공학회 (The Korean Society of Agricultural Engineers)
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초기 처짐을 갖는 Spherical Shell의 동적 특성에 관한 연구 (I) -기하학적 형상에 따른 동적 특성-

Dynamic Characteristics Analysis of Spherical Shell with Initial Deflection(I)

  • 발행 : 1998.06.01
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초록

The widespread use of thin shell structures has created a need for a systematic method of analysis which can adequately account for arbitrary geometric form. Therefore, the stress analysis of thin shell has been one of the more challenging areas of structural mechanics. The analysis of axisymmetric spherical shell is almost an every day occurrence in many industrial applications. A reliable and accurate finite element analysis procedure for such structures was needed. In general, the shell structures designed according to quasi-static analysis may fail under conditions of dynamic loading. For a more realistic prediction on the load carrying capacity of these shell, in addition to the dynamic effect, consideration should also include other factors such as nonlinearities in both material and geometry since these factors, in different manner, may also affect the magnitude of this capacity. The objective of this paper is to demonstrate the dynamic characteristics of spherical Shell. For these purpose, the spherical shell subjected to uniformly distributed step load was analyzed for its large displacements elasto-viscoplastic dynamic response. The results for the dynamic characteristics of spherical shell in the cases under various conditions of base-radius/central height(a/H) and thickness/shell radius(t/R) were summarized as follows: 1. The dynamic characteristics with a/H, 1) As the a/H increases, the amplitude of displacement increased. 2) The values of displacement Dynamic Magnification Factor (DMF) range from 2.9 to 6.3 in the crown of shell and the values of factor in the mid-point of shell range from 1.8 to 2.6. 3) As the a/H increases, the values of DMF in the crown of shell is decreased rapidly but the values of DMF in mid-point of shell is increased gradually. 4) The values of DMF of hoop-stresses range from 3.6 to 6.8 in the crown of shell and the values of factor in the mid-point of shell range from 2.3 to 2.6, the values of DMF of stress were larger than that of displacement. 2. The dynamic characteristics with t/R, 1) With the decrease of thickness of shell decreses, the amplitude of the displacement and the period increased. 2) The values of DMF of the displacement were range from 2.8 to 3.6 in the crown of shell and the values of factor in the mid-point of shell were range from 2.1 to 2.2.

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참고문헌

  1. Thesis for Ph.D.,University of California The analysis of thin shell by a finite element procedure C.Philip,Johnson
  2. computer & structures v.12 Nonlinear finite element analysis of shell structures using the semi-loof element H.Javaherian;P.J.Dowling;L.D.R.Lyons
  3. computer & structures v.7 Formulation and solution procedure for nonlinear structural analysis James,A.Stricklin;Walter,E.Haisler
  4. computer & structures v.15 no.3 Analysis of stresses in internally loaded cylindrical shells J.L.Urrutia-Galicia;A.N.Sherbourme
  5. computer & structures v.17 no.2 Geometrically nonlinear formulation for the axisymmetric transition finite elements Karan,S.Surana
  6. computer & structures v.21 no.5 Nonlinear axisymmetric static and transient analysis of orthotropic thin tapered circular plate K.N.Khatri;P.C.Dumir
  7. computer & structures v.15 no.5 Dynamic bucking of orthotropic shallow spherical shells M.Ganapathi;T.K.Varadan
  8. proc. conf. on matrix methods in structural mechanics A general approach to the problems of plasticity and large deformation using isoparametric elements O.C.Zienkiewicz;G.G.Nayak
  9. computer & structures v.9 Dynamic buckling of axisymmetric spherical caps with initial imperfections Robert Kao
  10. computer & structures v.12 Nomlinear dynamics buckling of spherical caps with initial imperfections Robert Kao
  11. computer & structures v.7 Geometrically nonlinear finite element analysis of beams, fremes,arches and axisymmeric R.D.Wood;O.C.Zenkeiwcz
  12. AFFDL-TR-66-80 The linear elastic dynamic analysis of shell of by the matrix displacement method Stanley Klein
  13. computer & structures v.12 On finite element large displacement and elastic-plastic dynamic analysis of shell structures Tairo Ishizaki
  14. computer & structures v.8 Dynamics of shell of revolutionunder axisymmetric load involving shear deformation Yair Tene;Izhak Sheinman
  15. 한국농공학회지 v.38 no.5 탄성 지반상에 놓인 철근 콘크리트 축대칭 쉘의 정적 및 동적 해석(Ⅱ) 조진구