TY - CONF A1 - Mair, Georg A1 - Duffner, Eric A1 - John, Sebastian A1 - Szczepaniak, Mariusz T1 - Burst strength as safetycriteria for type 4 composite pressure vessels N2 - 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 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. T2 - 7. Sitzung der UN-ECE WP.29 Taskforce Revision der GTR 13 CY - Stuttgart, Germany DA - 06.11.2019 KW - Minimum burst ratio KW - Basic population KW - Scatter KW - Monte-Carlo experiment KW - Maximum service pressure KW - Production scatter KW - Failure rate PY - 2019 UR - https://wiki.unece.org/display/trans/GTR13-2-7th+session AN - OPUS4-50095 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -