Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
Search
Advanced search
OR
Browse
Search
Volume 48, Issue 5
Displaying 1-4 of 4 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
Original Paper
  • Improvement of Deformation Analysis for a Single-Deck Floating Roof under Accumulated Rain Water Condition
    Shoichi YOSHIDA
    Article type: Original paper
    2010 Volume 48 Issue 5 Pages 252-263
    Published: September 25, 2010
    Released on J-STAGE: December 03, 2010
    DOIhttps://doi.org/10.11181/hpi.48.252
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The floating roofs are used in large aboveground oil storage tanks to prevent evaporation of the content. The single-deck floating roofs, which are considered herein, consists of a thin circular plate called a deck attached to a buoyant ring of box-shaped cross section called a pontoon. Under the accumulated rain water condition, the deck is deflected largely, and both its edge part and the pontoon are compressed circumferentially. Since the load condition due to the rain water depends on the deflected deck shape, it is difficult to find the unique equilibrium condition. This paper describes the deformation analysis for the single-deck floating roofs under the accumulated rain water condition using the axisymmetric shell finite element method. The load incremental method, in which the equivalent nodal forces due to the rain water converges to identify to the rain water load derived from the deflected deck shape, is used.
    View full abstract
    Download PDF (1695K)
  • Deformation Analysis of a Single-Deck Floating Roof with Center Pontoon under Accumulated Rain Water Condition
    Shoichi YOSHIDA
    Article type: Original paper
    2010 Volume 48 Issue 5 Pages 264-275
    Published: September 25, 2010
    Released on J-STAGE: December 03, 2010
    DOIhttps://doi.org/10.11181/hpi.48.264
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The floating roofs are used in aboveground oil storage tanks to prevent evaporation of the content. The single-deck floating roof consists of a thin circular plate called a deck attached to a buoyant ring of box-shaped cross section called a pontoon. In large diameter tanks, a center pontoon may be attached on the center of deck plate of the single-deck floating roof. The center pontoon is a small cylinder with cone roof, and is considered to reduce the risk of pontoon buckling under the accumulated rain water condition. This paper describes the deformation analysis of the single-deck floating roofs with center pontoon under the accumulated rain water condition using the axisymmetric shell finite element method. The load incremental method, in which the equivalent nodal forces due to the rain water converges to identify to the rain water load derived from the deflected deck shape, is used.
    View full abstract
    Download PDF (1931K)
  • Static and Fatigue Strength of Twisted Specimen of Copper
    Kazuo KUNIYOSHI, Chobin MAKABE, Masaki FUJIKAWA, Daisaku SHINOHARA
    Article type: Original paper
    2010 Volume 48 Issue 5 Pages 276-282
    Published: September 25, 2010
    Released on J-STAGE: December 03, 2010
    DOIhttps://doi.org/10.11181/hpi.48.276
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    To make fine grain material by plastic working is one of the methods for improvement of material strength. In this study, from the viewpoint of basic plastic working, the variations of static ultimate tensile strength and fatigue strength after the application of plastic torsional deformation on pure copper were investigated. Tensile test, Vickers hardness test and Rotating bending fatigue test were performed. The hardness of the materials varied from surface layer to center section in cross sectional area. The tensile strength was improved after applying torsional deformation. However, the fatigue strength was not improved. This is strongly related to hardness distribution around the surface layer of the specimen. Thus, the plastic softening was occurred in surface layer when the very fine grain was created by torsional deformation.
    View full abstract
    Download PDF (913K)
  • Study on fatigue fracture toughness in terms of Beremin model
    Hiroshi MIMURA
    Article type: Original paper
    2010 Volume 48 Issue 5 Pages 283-290
    Published: September 25, 2010
    Released on J-STAGE: December 03, 2010
    DOIhttps://doi.org/10.11181/hpi.48.283
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Experimental data on the fatigue fracture toughness test cited from two papers are shown to be well explained on the basis of the Beremin model. It is suggested that estimation for fracture probability of structures should be made by taking into account fatigue propagation path length, and that fatigue fracture toughness test might give a useful means to study the fracture probability in the low fracture toughness and low fracture probability region.
    View full abstract
    Download PDF (103K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top