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Evaluation of the mechanical performance of a composite multi-cell tank for cryogenic storage: part II - experimental assessment

Stief, Malte und Rajabzadeh, Aydin und Zarouchas, Dimitrios S und Groves, Roger M und Koussios, Sotiris und Rinze, Benedictus und Tapeinos, Ilias (2019) Evaluation of the mechanical performance of a composite multi-cell tank for cryogenic storage: part II - experimental assessment. International Journal of Hydrogen Energy. Elsevier. doi: 10.1016/j.ijhydene.2018.12.063. ISSN 0360-3199.

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Kurzfassung

Cryogenic fuel containment at tank configurations that can conform to a prescribed space is of significant importance for hypersonic aircrafts. To ensure a safe flight, continuous monitoring of temperature, strain and damage initiation/propagation of the tank is crucial. The possibilities to perform these tasks are strongly dependent on the way the tank itself is designed and manufactured. Therefore, the study presented here focuses on both the analysis and full experimental evaluation of an innovative multi-spherical composite-overwrapped pressure vessel under hydrostatic testing at ambient conditions and pressure cycling with a cryogenic medium (LN2). The tested tank (scaled to 44 [l]) consists of four partly merged quasi isotropically reinforced spherical cells, where the intersections are strengthened by additional UD straps; the central cylindrical cavity is reinforced by an inserted hollow tube (aluminum). The design is characterized by the equal shell strain principle between the spheres and sphere connecting areas (intersections). During hydro-burst testing at a high displacement rate, the strain and damage progression was monitored with Digital-ImageCorrelation (DIC) and Acoustic Emission (AE) techniques. The effect of LN2 filling, pressure cycling and draining on the composite overwrap temperature gradient and related strains was additionally obtained with Fiber Bragg Gratings (FBGs) and thermocouples. The findings of this study were compared to a FEM-based thermo-mechanical model coupled with a progressive failure analysis (PFA) as presented in part I of this study (FE) [14]. The results of the hydrostatic tests completely verified the analytical and FE-based equal strain design principle where the predicted failure took place at the vicinity of the hollow center tube in a leak-before-burst sequence. In addition, stress-strain measurements in the cryogenic regime verified the suitability of the involved stiffness and CTE fitting functions (FE model). As a general conclusion, the most important finding here is the absence of damage in the composite shell; this may be regarded as a positive indication about the suitability of conformal Type IV multi-spherical COPVs for cryogenic storage. It is however believed that a careful consideration of the temperature-dependent strain field remains a critical parameter. Ideally, this strain field should be as homogeneous as possible to avoid CTE induced stress concentrations.

elib-URL des Eintrags:https://elib.dlr.de/125295/
Dokumentart:Zeitschriftenbeitrag
Titel:Evaluation of the mechanical performance of a composite multi-cell tank for cryogenic storage: part II - experimental assessment
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Stief, MalteMalte.Stief (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Rajabzadeh, AydinNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Zarouchas, Dimitrios SNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Groves, Roger MNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Koussios, SotirisNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Rinze, BenedictusNICHT SPEZIFIZIERTNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Tapeinos, IliasDelft University of Technology, Delft, The NetherlandsNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2019
Erschienen in:International Journal of Hydrogen Energy
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
DOI:10.1016/j.ijhydene.2018.12.063
Verlag:Elsevier
ISSN:0360-3199
Status:veröffentlicht
Stichwörter:Composites, Multi-cell tank, Hydrostatic Burst, Cryo-cycling, Strain Monitoring, Damage progression
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Raumtransport
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R RP - Raumtransport
DLR - Teilgebiet (Projekt, Vorhaben):R - Leitprojekt - Forschungsverbund Oberstufe (alt)
Standort: Bremen
Institute & Einrichtungen:Institut für Raumfahrtsysteme > Transport- und Antriebssysteme
Hinterlegt von: Behnke, Manuela
Hinterlegt am:19 Dez 2018 13:14
Letzte Änderung:15 Jun 2023 10:36

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