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Burst strength as safetycriteria for type 4 composite pressure vessels

  • Safety aspects of the storage containments of hydrogen are independent from the kind of usage: The main criteria is the resistance against the pressure load. On the 2nd level there are aspects specific to the usage as e.g. crash loads etc. Safety is achieved when the probability (frequency) of a failure during the service life is acceptable! But an aspect common for all usages is the scatter of properties resulting from the material and the production. Therefore, it is worth to have a look on the current approach of minimum burst ratios from an unknown point of view: the basic populations of a product – based on exemplarily assessments. According to this approach, several diagrams with Monte-Carlo generated basic populations in new and aged conditions have been shown. Thus, it has been demonstrated that not the conditions at the begin of life are the critical ones. No, the end of life properties are the critical ones. This has been combined with the acceptance rate of borderlineSafety aspects of the storage containments of hydrogen are independent from the kind of usage: The main criteria is the resistance against the pressure load. On the 2nd level there are aspects specific to the usage as e.g. crash loads etc. Safety is achieved when the probability (frequency) of a failure during the service life is acceptable! But an aspect common for all usages is the scatter of properties resulting from the material and the production. Therefore, it is worth to have a look on the current approach of minimum burst ratios from an unknown point of view: the basic populations of a product – based on exemplarily assessments. According to this approach, several diagrams with Monte-Carlo generated basic populations in new and aged conditions have been shown. Thus, it has been demonstrated that not the conditions at the begin of life are the critical ones. No, the end of life properties are the critical ones. This has been combined with the acceptance rate of borderline basic populations. The approach of minimum burst ratios leads to the acceptance rate of 40 % and higher for the approval of critical basic populations – critical due to their production scatter. This problem becomes much more critical when taking into account the unknown effects of degradation and in-service ageing. Therefore, we cannot support the proposed reduction of minimum burst ratio without having a stronger assessment of production scatter.zeige mehrzeige weniger

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  • 2019 GTR13-07-15_BAM_Safety-minimum_burst_ratio 2019-11-07rev.pdf
    eng

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Metadaten
Autor*innen:Georg MairORCiD
Koautor*innen:Eric Duffner, Sebastian John, Mariusz Szczepaniak
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2019
Organisationseinheit der BAM:3 Gefahrgutumschließungen; Energiespeicher
3 Gefahrgutumschließungen; Energiespeicher / 3.0 Abteilungsleitung und andere
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Angewandte Physik
Freie Schlagwörter:Basic population; Failure rate; Maximum service pressure; Minimum burst ratio; Monte-Carlo experiment; Production scatter; Scatter
Themenfelder/Aktivitätsfelder der BAM:Energie
Veranstaltung:7. Sitzung der UN-ECE WP.29 Taskforce Revision der GTR 13
Veranstaltungsort:Stuttgart, Germany
Beginndatum der Veranstaltung:06.11.2019
Enddatum der Veranstaltung:07.11.2019
URL:https://wiki.unece.org/display/trans/GTR13-2-7th+session
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:19.12.2019
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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