Journal of High Pressure Institute of Japan
Online ISSN : 1347-9598
Print ISSN : 0387-0154
ISSN-L : 0387-0154
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Volume 53, Issue 1
Displaying 1-6 of 6 articles from this issue
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Original Paper
  • Buckling Analysis of Cylindrical Shells of Axially Variable Wall Thickness Partially Subjected to External and Internal Liquid Pressures
    Hiroshi OHYA
    2015 Volume 53 Issue 1 Pages 5-15
    Published: January 25, 2015
    Released on J-STAGE: February 26, 2015
    DOIhttps://doi.org/10.11181/hpi.53.5
    JOURNAL FREE ACCESS
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    The finite element method is applied to buckling analysis of cylindrical shells of axially variable wall thickness partially subjected to external and internal liquid pressures. The effects of the internal liquid height and the difference of mass density between external and internal liquids on the buckling liquid height are investigated. Based on the results of the finite element analyses, the simplified equations to calculate buckling liquid height with the effect of internal liquid are established. The simplified equations are applied to buckling analysis of model tanks and the validity of the simplified equations for buckling analysis of cylindrical shells of axially variable wall thickness are demonstrated.
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  • Proposal on Validity Assessment of KIc Testing for Micro-void Coalescence Type Fracture
    Akira KIUCHI, Kenichi ISHIHARA
    2015 Volume 53 Issue 1 Pages 16-26
    Published: January 25, 2015
    Released on J-STAGE: February 26, 2015
    DOIhttps://doi.org/10.11181/hpi.53.16
    JOURNAL FREE ACCESS
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    In the previous report, we investigated the validity on a size requirement for KIc testing in the proposed revision of ISO 12135, W-a≥1. 1 (KQ⁄σys)2 , on the basis of 3 dimensional elastic-plastic finite element analyses of CT specimens. It was demonstrated that there was a risk that we recognized KQPl, which means KQ obtained as a result of the plasticity at the crack tip without the crack extension, to be a plane strain fracture toughness KIc, although the size requirement of W-a≥1. 1 (KQ⁄σys)2 was met. Meanwhile, there was a merit that KIc might be obtained by using small size specimens in the range of 1. 1≤ (W-a) ⁄ (KQ⁄σys)2 <2. 5.
    In this report, a new validity assessment of KIc testing for micro-void coalescence type fracture is proposed on the basis of the previous report.
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