TY - CONF A1 - Popiela, Bartosz T1 - PhD Topic 5: Summer School Update. Influence of manufacturing process related residual stresses in wound composite material on the operational safety of H2 pressure vessels N2 - The presentation is an update on the progress of the PhD Project. It focuses on the residual stress induction during the winding process of type 4 composite pressure vessels. Moreover, an overview of the experimental study is given, with focus on the manufacturing of composite pressure vessels. T2 - Summer School 2023 - BTU-BAM Graduate School "Trustworthy Hydrogen" CY - Berlin, Germany DA - 04.09.2023 KW - Residual stress KW - Composite KW - Pressure vessel KW - Hydrogen PY - 2023 AN - OPUS4-58239 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Non-Destructive Testing of Type 4 Composite Pressure Vessels N2 - Non-Destructive Testing (NDT) of type 4 composite pressure vessels can be seen as key to better understanding the behaviour of the composite structure and the impact of the manufacturing process on its quality. In this presentation, NDT methods used in the “Trustworthy Hydrogen” project are introduced. A brief discussion of the observed phenomena is provided. T2 - Visit of a delegation from Korea Fire Institute (KFI) CY - Berlin, Germany DA - 24.06.2024 KW - Composite KW - Pressure vessel KW - Non-destructive testing PY - 2024 AN - OPUS4-60401 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Influence of manufacturing process related residual stresses in wound composite material on the operational safety of H2 pressure vessels: PhD Topic Introduction N2 - Short introduction of the PhD Topic 5 in the BTU-BAM Graduate School "Trustworthy Hydrogen". Description of the objectives, deliverables and expected added value of the thesis. T2 - Introduction Week - BTU-BAM Graduate School "Trustworthy Hydrogen" CY - Berlin, Germany DA - 16.01.2023 KW - Residual stress KW - Composite KW - Pressure vessel KW - Hydrogen PY - 2023 AN - OPUS4-56882 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Experimental study on the impact of manufacturing process related residual stresses in wound composite material on the operational safety of H2 pressure vessels N2 - The presentation is an update on the progress of the PhD Project. It focuses on the experimental investigation of the impact of residual stresses on the reliability of type 4 composite pressure vessels. T2 - Summer School 2024 - BTU-BAM Graduate School "Trustworthy Hydrogen" CY - Cottbus, Germany DA - 07.10.2024 KW - Composite KW - Pressure vessel KW - Residual stresses KW - Burst test PY - 2024 AN - OPUS4-61272 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Modelling of the manufacturing related residual stresses in type 4 pressure vessels for hydrogen storage N2 - Presentation about modelling of the residual stresses in type 4 pressure vessels for hydrogen storage at the European PhD Hydrogen Conference 2024 in Ghent, Belgium. T2 - European PhD Hydrogen Conference 2024 (EPHyC2024) CY - Ghent, Belgium DA - 20.03.2024 KW - Composite KW - Pressure vessel KW - Residual stresses PY - 2024 AN - OPUS4-59757 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Einfluss der fertigungsbedingten Eigenspannungen auf die Sicherheit von Typ 4-Druckbehältern N2 - Vorstellung der Erkenntnisse aus einer experimentellen Studie mit langsamen Berstprüfungen an Typ 4-Druckbehältern bei einer Arbeitskreis-Sitzung "Wasserstoff-Drucktanks" der AVK. T2 - AVK-Arbeitskreis-Sitzung "Wasserstoff-Drucktanks" CY - Frankfurt am Main, Germany DA - 26.09.2024 KW - Wasserstoff KW - Druckbehälter KW - Eigenspannungen KW - Langsame Berstprüfung PY - 2024 AN - OPUS4-61134 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Embedding of Fiber Optic Sensors Under Industrial Conditions and Distributed Strain Sensing in Type 4 Composite Pressure Vessels N2 - A presentation on the embedding of fiber optic sensors into the composite structure of type 4 composite pressure vessels. Also, the impact of the embedded fiber optic sensors on the burst pressures of type 4 composite pressure vessels was discussed. The presentation was held at ICCM24 in Baltimore, Maryland. T2 - 24th International Conference on Composite Materials CY - Baltimore, Maryland, USA DA - 04.08.2025 KW - Composite KW - Pressure vessel KW - Filament winding KW - Fiber optic sensors PY - 2025 AN - OPUS4-63885 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Project summary: Impact of manufacturing process related residual stresses in wound composite material on the operational safety of hydrogen pressure vessels N2 - This presentation is a summary of a doctoral project within the BTU-BAM Graduate School 'Trustworthy Hydrogen'. The results of both theoretical and experimental investigations are presented and discussed. T2 - Summer School 2025 - BTU-BAM Graduate School "Trustworthy Hydrogen" CY - Berlin, Germany DA - 05.07.2025 KW - Composite KW - Pressure vessel KW - Residual stresses KW - Burst test KW - Filament winding KW - Carbon fiber PY - 2025 AN - OPUS4-63067 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Better with age? Discussion of creep phenomena during initial loading of type 4 composite pressure vessels N2 - A presentation on the impact of creep phenomena during initial loading on the safety of type 4 composite pressure vessels. A statistical evaluation of slow burst tests shows an increase of the survival rate of initially loaded composite pressure vessels (sustained load and increased pressure) compared to the ones tested in a brand-new state. T2 - ASME Pressure Vessels & Piping Conference (ASME PVP 2025) CY - Quebec, Canada DA - 20.07.2025 KW - Composite KW - Pressure vessel KW - Safety PY - 2025 AN - OPUS4-63760 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Better with age? Discussion of creep phenomena during initial loading of type 4 composite pressure vessels N2 - To maintain the highest safety standards for compressed gas storage in composite pressure vessels, a deeper understanding of their ageing mechanism is required. In the present study, the impact of an initial loading under increased temperature and sustained pressure on the safety of type 4 composite pressure vessels is investigated. Two designs of type 4 cylinders were manufactured, the only difference being the internal pressure function used during the filament winding process. Hence, their residual stress state and the quality of the composite layers varied. Ten pressure vessels were initially loaded under sustained pressure and increased temperature, and later subjected to slow burst tests. Comparing the results with cylinders tested in a pristine state underlines a significant improvement in the performance of initially loaded cylinders of one of the designs. This phenomenon was caused by a significant decrease of the scattering of burst pressures within a sample. At the same time, a slight decrease of the burst pressures could be observed. An explanation of this behavior could be supported by strain measurements with fiber optic sensors, which were embedded in the composite material. The strains measured during the initial loading indicate a stress redistribution, which has an impact on the strength of the pressure vessel. Moreover, an increased stiffness during the slow burst tests after initial loading was observed that indicates a better exploitation of the individual layers of the composite structure. The study supports previous observations on the increased performance after initial loading and provides new insights into the strain development in creep effects in type 4 pressure vessels. T2 - AZL Aachen Composite Pipes & Vessels Workgroup Meeting CY - Aachen, Germany DA - 11.11.2025 KW - Composite KW - Pressure vessel KW - Filament winding KW - Creep PY - 2025 AN - OPUS4-64667 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Better with age? Discussion of creep phenomena during initial loading of type 4 composite pressure vessels N2 - A presentation on the impact of creep phenomena during initial loading on the safety of type 4 composite pressure vessels. A statistical evaluation of slow burst tests shows an increase of the survival rate of initially loaded composite pressure vessels (sustained load and increased pressure) compared to the ones tested in a brand-new state. T2 - H2 Safety - Kolloquium (TestCert) CY - Berlin, Germany DA - 12.11.2025 KW - Composite KW - Pressure vessel KW - Filament winding KW - Burst test KW - Creep PY - 2025 AN - OPUS4-64690 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Popiela, Bartosz T1 - Einfluss ausgewählter Fertigungsparameter auf die Sicherheit von Composite-Druckbehältern N2 - In dem Vortrag wurde der Einfluss ausgewählter Fertigungsparameter auf die Sicherheit von Composite-Druckbehältern diskutiert. Die Inhalte stammen aus einem Projekt im Rahmen des BTU-BAM Graduiertenkollegs "Trustworthy Hydrogen". Darüber hinaus umfasst der Foliensatz eine Kurzvorstellung der Aktivitäten des Fachbereichs 3.5 im Bereich der Wasserstofftechnologien. T2 - Workshop "Wasserstoff in der Luftfahrt: Wasserstoffspeicherung und -transport für Luftfahrt und darüber hinaus" CY - Berlin, Germany DA - 11.02.2026 KW - Composite KW - Druckbehälter KW - Fertigung PY - 2026 AN - OPUS4-65498 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -