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 6
Displaying 1-4 of 4 articles from this issue
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Original Paper
  • Further Study on the Cumulative Damage Rule Considering Multi-Axial Stress State for Low Cycle Fatigue Behavior of Elbow Piping
    Yoshio URABE
    2015 Volume 53 Issue 6 Pages 292-302
    Published: November 25, 2015
    Released on J-STAGE: December 29, 2015
    DOIhttps://doi.org/10.11181/hpi.53.292
    JOURNAL FREE ACCESS
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    According to the previous report, low cycle fatigue strength of the pipe bend specimens subjected to in-plane cyclic bending displacement is beneath the best fit fatigue curve and its reason can be explained by the cumulative damage rule considering reduction of fracture ductility under multi-axial stress state. Further discussion of the proposed cumulated damage rule considering reduction of fracture ductility induced by multi-axial stress degree is shown in this paper. First, physical meaning of the proposed cumulative damage rule is clarified using equivalent plastic strain range. Secondly, estimated low cycle fatigue lives based on the proposed cumulative damage rule are compared with the experimentally obtained fatigue lives. Also, similar comparison is carried out on the equivalent strain range. The equivalent strain ranges for fatigue analyses have good coincidences with the estimated values by the proposed cumulative damage rule. Thus, applicability of the proposed cumulative damage rule considering multi-axial stress degree is again confirmed for elbow piping subjected to in-plane cyclic bending displacement. Finally, low cycle fatigue equation including ductility exhaustion considering multi-axial stress state is proposed and is compared with the advanced revised universal slope method which is an empirical fatigue equation proposed by the author. These two equations have a good coincidence each other and also with experimental data. Thus, adequacy of these equations is confirmed.
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  • Dent Depth Characteristics of Soft Samples Using Cyclic Low-loading Creep Testing
    Osamu YOKOTA, Mitsuo NAGAO, Tomohiro NAKAMURA
    2015 Volume 53 Issue 6 Pages 303-310
    Published: November 25, 2015
    Released on J-STAGE: December 29, 2015
    DOIhttps://doi.org/10.11181/hpi.53.303
    JOURNAL FREE ACCESS
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    A cyclic low-loading creep tester to measure dent depth has been developed for experimental analysis of instantaneous creep behavior and its recovery behavior. This paper describes an experiment result in which depth measurement of dent formed on the surface of soft samples using an air jet was obtained by cyclic loading and unloading of several times. It is confirmed that the skin gel depends on the instantaneous elastic deformation and the slime is dependent on both the instantaneous and delayed elastic deformation. When the recovery time become long and the load time is held, the envelope obtained from the slime is left from the creep load curve. On the other hand, the envelope tended to approach the creep load curve, when the loading time is lengthened and the recovery time is fixed.
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Review
  • Massive Fire Incident of Aboveground Oil Storage Tanks in Puerto Rico
    Shoichi YOSHIDA
    2015 Volume 53 Issue 6 Pages 311-321
    Published: November 25, 2015
    Released on J-STAGE: December 29, 2015
    DOIhttps://doi.org/10.11181/hpi.53.311
    JOURNAL FREE ACCESS
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    On October 23, 2009, gasoline overflowed and sprayed out from a large aboveground storage tank at the Caribbean Petroleum Corporation's terminal facility near San Juan, Puerto Rico. The leakage which continued for 26 minutes led to a severe vapor cloud. An unconfined vapor cloud explosion occurred and it resulted a massive fire of 17 aboveground storage tanks. The fire continued to burn for 59 hours. The U. S. Chemical Safety and Hazard Investigation Board (CSB) released the report on the cause of this incident. The root cause was an unreliable liquid level control and monitoring system which did not provide accurate and timely information for the operator to prevent overfilling. This paper describes the incident according to the CSB report.
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