Long term material properties of pressure vessels made of composite material
MetadataShow full item record
Pressure vessels are currently the limiting factor in the hydrogen distribution chain. The pressure vessels are preferably made out of composite materials to achieve practical weight to strength ratios and avoid hydrogen cracking in steels, which is the alternative material. While composites are more environmentally stable and stronger, they are inherently more complex mechanically. To allow full use of the composite materials potential, better modelling and structural integrity monitoring methods needs to be developed. In this work, methods have been developed to better model and monitor damage from mechanical loads on composite materials, with particular application to filament wound materials such as used in pressure vessels. The goal of the work is to allow better use of composite material’s potential in hydrogen pressure vessels. The methods may achieve this by allowing better lifetime estimates and structural integrity monitoring along with increased understanding for the failure mechanisms. The failure mechanisms and progressive fatigue damage was studied using digital image correlation (DIC) applied on split disk fatigue tests of pressure vessel cut outs. As part of this work a novel method for monitoring damage progression was used and suggested on the experimental level. The DIC data was used to estimate S-N curves for the fiber direction on the local level using a novel method that may also be used as a damage monitoring method. The S-N curves were used as input for a fatigue damage model formulated as a user material subroutine (UMAT) in the finite element software Abaqus capable of modelling fatigue damage in composite materials. The UMAT and the experiment matched in terms of damage development.
Has partsPaper 1: Hugaas, Eivind; Echtermeyer, Andreas. Filament wound composite fatigue mechanisms investigated with full field DIC strain monitoring. Open Engineering 2021 ;Volum 11.(1) s. 401-413 https://doi.org/10.1515/eng-2021-0041 This work is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0)
Paper 2: Hugaas, Eivind; Echtermeyer, Andreas. Estimating SN curves for local fiber dominated fatigue failure in ring specimens representing filament wound pressure vessels with damage. Composites Part C: Open Access 2021 ;Volum 5. https://doi.org/10.1016/j.jcomc.2021.100135 This is an open access article under the CC BY-NC-ND license
Paper 3: Hugaas, Eivind; Vedvik, Nils Petter; Echtermeyer, Andreas. Progressive fatigue failure analysis of a filament wound ring specimen with a hole. Journal of Composites Science 2021 ;Volum 5.(9) https://doi.org/10.3390/jcs5090251 This is an open access article distributed under the Creative Commons Attribution License (CC BY 4.0)