Relevant bibliographies by topics / Composite Over-Wrapped Pressure Vessels (COPV)

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Composite Over-Wrapped Pressure Vessels (COPV)'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Composite Over-Wrapped Pressure Vessels (COPV).'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Composite Over-Wrapped Pressure Vessels (COPV)"

1

Yu, Bin, Yang Zhou, Zhi Dong Liu, Qin Chen Jin, Wei Wei Zhao, Bin Cheng, Wei Chen, and Jian Shen. "Design, Development and Qualification of High Performance Load Sharing Composite Pressure Vessel for Aircraft Application." Advanced Materials Research 631-632 (January 2013): 50–55. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.50.

Full text
Abstract:
Load sharing metal lined composite pressure vessel(COPV) enables significant safety and reliability over those vessels with non-load-sharing metallic or non-metallic liners, The key technical challenge in developing these vessels will be to calculate the optimized liner thickness and liner elastic strain. This paper presents techniques developed at Lanzhou Institute of Physics(LIP) for the design of elastically operating metal liner COPV in terms of NET theory which modified by LIP. Five metal materials are discussed and analytical techniques for determining liner thickness are presented, selection of materials for maximizing performance and minimizing weight is discussed. L490A-COPV development is introduced, performance factor is improved from 23 Km to 29.5Km.
APA, Harvard, Vancouver, ISO, and other styles
2

Yu, Bin, Jian Jun Zhang, Ji Peng Zhao, and Tian Ju Ma. "Mechanical Study of Carbon Fiber Reinforced Plastic and Thin-walled Metal Liner in Bi-Material COPV Based on Grid Theory Optimization." Materials Science Forum 1027 (April 2021): 15–21. http://dx.doi.org/10.4028/www.scientific.net/msf.1027.15.

Full text
Abstract:
Composite over-wrapped pressure vessel (COPV) with ultra-thin metal liner and high strength carbon fiber reinforced plastic (CFRP) structure was widely used in space system. Meanwhile, there are some difficulties in the calculation of COPV stress-strain state related to the elastic-plastic liner and elastic composite. In this paper a novel design theory was proposed for calculating stress distribution in the bi-material COPV and determining the optimal thickness parameters of COPV based on traditional grid theory optimization. This new theory named Parameters Correspondence Relationship Structure Design Method (PCRSDM) can increase the design precision and structure performance factor of COPV compared to traditional grid theory. The correct models of mechanical characteristic between liner and CFRP are established from the view of optimized grid theory, the present theory is useful to develop a theoretical framework to calculate and design the COPV double shells. The COPV stress-strain behavior is also systemically studied by the ANSYS finite element analysis (FEA), the results show good agreement between FEA simulation and PCRSDM calculation. Both FEA and PCRSDM can meet the design requirements of COPV. A complete design, development and qualification testing of a specialized COPV used to satellite propulsion system was successfully conducted to verify the COPV design in terms of PCRSDM and FEA, the result show that PCRSDM is suitable for the design of COPV.
APA, Harvard, Vancouver, ISO, and other styles
3

William, Gergis W., Samir Shoukry, Jacky Prucz, and Thomas Evans. "Finite Element Analysis of Composite Over-wrapped Pressure Vessels for Hydrogen Storage." SAE International Journal of Passenger Cars - Mechanical Systems 6, no. 3 (September 24, 2013): 1499–504. http://dx.doi.org/10.4271/2013-01-2477.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Liu, Zhi Dong, Bin Yu, Qing Chen Jin, and Wei Chen. "Design and Qualification of a Advanced Hybrid Filament-Wound Composite Pressure Vessel for Aircraft Application." Advanced Materials Research 631-632 (January 2013): 67–72. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.67.

Full text
Abstract:
This paper describes a composite pressure vessel(COPV) development program which have been finished by Lanzhou Institute of Physics (LIP). In order to dramatically improve reliability and safety of COPV applied in military aircraft, this COPV(L376-COPV) design relies partly on the heritage of mature technologies and was developed in combination with existing and new technologies, Unlike traditional COPV, the impact resistant capability from high energy bullet of L376-COPV is improved greatly by liner material heart treatment and T800/K49 fiber hybrids over-wrap. L376-COPV design, analysis, manufacturing, testing and results was introduced.
APA, Harvard, Vancouver, ISO, and other styles
5

Çetin, Muzaffer, and Kemal Yaman. "Location Size and Orientation Effect of Semi elliptical Surface Crack on the Fracture of a Type 3 Composite Pressure Vessel using J integral Method." Defence Science Journal 70, no. 1 (February 10, 2020): 23–34. http://dx.doi.org/10.14429/dsj.70.14578.

Full text
Abstract:
In this study, structural design and analysis of a type-3 composite over wrapped pressure vessel used in a military satellite propulsion system is presented. The aim is to design a composite tank lighter than all metal fuel tanks having the same volume. Moreover, necessary design stages have been revealed for similar composite over wrapped pressure vessels. ANSYS® is used to perform the stress-strain analysis of both metal and composite parts, to determine the optimum winding angle, tank Autofrettage and fracture characteristic for the metal liner considering the crack morphology. Tsai-Hill, Tsai-Wu and Hashin theories have been implemented to investigate the various failure modes of the composite vessel. Location, size and orientation angle of semi-elliptical surface crack has a pronounced effect on fracture characteristic of the liner. In fracture investigation J-integral method is used. It is foreseen that even in the most critical crack, the crack will not propagate and there will be no burst in the tank for proposed loading conditions. Numerical results are good agreement with the experimental results.
APA, Harvard, Vancouver, ISO, and other styles
6

Souza, G., and JR Tarpani. "Using OBR for pressure monitoring and BVID detection in type IV composite overwrapped pressure vessels." Journal of Composite Materials, August 20, 2020, 002199832095161. http://dx.doi.org/10.1177/0021998320951616.

Full text
Abstract:
Type IV COPVs (Composite Overwrapped Pressure Vessels) are among the most suited structures for hydrogen storage. However, its complex modes of failure and requirement for periodic maintenance has led the industry to apply high safety factors on designs. This is one of the challenges inhibiting the widespread usage of the H2 in commercial vehicles. Structural health monitoring based on optical fibers is an emerging technology that can overcome these problems, as a neural network of sensors can be integrated to the structure during manufacturing and is readily accessible over the vessel lifetime. This gives information about the real structure condition, reducing overall maintenance costs. Here, core optical fibers were embedded in type IV COPVs during the manufacturing process and monitored with OBR (Optical Backscatter Reflectometer). Sensors were interrogated during an impact detection test and a pressurization test until burst failure. Fibers were capable of detecting the position and intensity of the damage in the first test and provided strain profiles over the entire length of the vessel for longitudinal and circumferential directions on the second. Optical microscopy of vessel sections showed matrix accumulation around the optical fiber as the main cause of sensor’s failure. During pressurization, steep peaks of strain in the dome regions from the early measurements indicated the burst failure site.
APA, Harvard, Vancouver, ISO, and other styles
7

Kartav, Osman, Serkan Kangal, Kutay Yücetürk, Metin Tanoğlu, Engin Aktaş, and H. Seçil Artem. "Development and analysis of composite overwrapped pressure vessels for hydrogen storage." Journal of Composite Materials, July 19, 2021, 002199832110335. http://dx.doi.org/10.1177/00219983211033568.

Full text
Abstract:
In this study, composite overwrapped pressure vessels (COPVs) for high-pressure hydrogen storage were designed, modeled by finite element (FE) method, manufactured by filament winding technique and tested for burst pressure. Aluminum 6061-T6 was selected as a metallic liner material. Epoxy impregnated carbon filaments were overwrapped over the liner with a winding angle of ±14° to obtain fully overwrapped composite reinforced vessels with non-identical front and back dome layers. The COPVs were loaded with increasing internal pressure up to the burst pressure level. During loading, deformation of the vessels was measured locally with strain gauges. The mechanical performances of COPVs designed with various number of helical, hoop and doily layers were investigated by both experimental and numerical methods. In numerical method, FE analysis containing a simple progressive damage model available in ANSYS software package for the composite section was performed. The results revealed that the FE model provides a good correlation as compared to experimental strain results for the developed COPVs. The burst pressure test results showed that integration of doily layers to the filament winding process resulted with an improvement of the COPVs performance.
APA, Harvard, Vancouver, ISO, and other styles
8

Kangal, Serkan, A. Harun Sayı, Ozan Ayakdaş, Osman Kartav, Levent Aydın, H. Seçil Artem, Engin Aktaş, et al. "A Comprehensive Study on Burst Pressure Performance of Aluminum Liner for Hydrogen Storage Vessels." Journal of Pressure Vessel Technology 143, no. 4 (February 11, 2021). http://dx.doi.org/10.1115/1.4049644.

Full text
Abstract:
Abstract This paper presents a comparative study on the burst pressure performance of aluminum (Al) liner for type-III composite overwrapped pressure vessels (COPVs). In the analysis, the vessels were loaded with increasing internal pressure up to the burst pressure level. In the analytical part of the study, the burst pressure of the cylindrical part was predicted based on the modified von Mises, Tresca, and average shear stress criterion (ASSC). In the numerical analysis, a finite element (FE) model was established in order to predict the behavior of the vessel as a function of increasing internal pressure and determine the final burst. The Al pressure vessels made of Al-6061-T6 alloy with a capacity of 5 L were designed. The manufacturing of the metallic vessels was purchased from a metal forming company. The experimental study was conducted by pressurizing the Al vessels until the burst failure occurred. The radial and axial strain behaviors were monitored at various locations on the vessels during loading. The results obtained through analytical, numerical, and experimental work were compared. The average experimental burst pressure of the vessels was found to be 279 bar. The experimental strain data were compared with the results of the FE analysis. The results indicated that the FE analysis and ASSC-based elastoplastic analytical approaches yielded the best predictions which are within 2.2% of the experimental burst failure values. It was also found that the elastic analysis underestimated the burst failure results; however, it was effective for determining the critical regions over the vessel structure. The strain behavior of the vessels obtained through experimental investigations was well correlated with those predicted through FE analysis.
APA, Harvard, Vancouver, ISO, and other styles
9

Engelbrecht-Wiggans, Amy, and Stuart Leigh Phoenix. "A Stochastic Model Based on Fiber Breakage and Matrix Creep for the Stress-Rupture Failure of Unidirectional Continuous Fiber Composites 2. Non-linear Matrix Creep Effects." Frontiers in Physics 9 (March 29, 2021). http://dx.doi.org/10.3389/fphy.2021.644815.

Full text
Abstract:
Stress rupture (sometimes called creep-rupture) is a time-dependent failure mode occurring in unidirectional fiber composites under high tensile loads sustained over long times (e. g., many years), resulting in highly variable lifetimes and where failure has catastrophic consequences. Stress-rupture is of particular concern in such structures as composite overwrapped pressure vessels (COPVs), tension members in infrastructure applications (suspended roofs, post-tensioned bridge cables) and high angular velocity rotors (e.g., flywheels, centrifuges, and propellers). At the micromechanical level, stress rupture begins with the failure of some individual fibers at random flaws, followed by local load-transfer to neighboring intact fibers through shear stresses in the matrix. Over time, the matrix between the fibers creeps in shear, which causes lengthening of local fiber overload zones around previous fiber breaks, resulting in even more fiber breaks, and eventually, formation clusters of fiber breaks of various sizes, one of which eventually grows to a catastrophically unstable size. Most previous models are direct extension of classic stochastic breakdown models for a single fiber, and do not reflect the micromechanical detail, particularly in terms of the creep behavior of the matrix. These models may be adequate for interpreting experimental, composite stress rupture data under a constant load in service; however, they are of highly questionable accuracy under more complex loading profiles, especially ones that initially include a brief “proof test” at a “proof load” of up to 1.5 times the chosen service load. Such models typically predict an improved reliability for proof-test survivors that is higher than the reliability without such a proof test. In our previous work relevant to carbon fiber/epoxy composite structures we showed that damage occurs in the form of a large number of fiber breaks that would not otherwise occur, and in many important circumstances the net effect is reduced reliability over time, if the proof stress is too high. The current paper continues our previous work by revising the model for matrix creep to include non-linear creep whereby power-law creep behavior occurs not only in time but also in shear stress level and with differing exponents. This model, thus, admits two additional parameters, one determining the sensitivity of shear creep rate to shear stress level, and another that acts as a threshold shear stress level reminiscent of a yield stress in the plastic limit, which the model also admits. The new model predicts very similar behavior to that seen in the previous model under linear viscoelastic behavior of the matrix, except that it allows for a threshold shear stress. This threshold allows consideration of behavior under near plastic matrix yielding or even matrix shear failure, the consequence of which is a large increase in the length-scale of load transfer around fiber breaks, and thus, a significant reduction in composite strength and increase in variability. Derivations of length-scales resulting from non-linear matrix creep are provided as Appendices in the Supplementary Material.
APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic "Composite Over-Wrapped Pressure Vessels (COPV)"

1

Ndashimye, Maurice. "Accounting for proof test data in Reliability Based Design Optimization." Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97108.

Full text
Abstract:
Thesis (MSc)--Stellenbosch University, 2015.
ENGLISH ABSTRACT: Recent studies have shown that considering proof test data in a Reliability Based Design Optimization (RBDO) environment can result in design improvement. Proof testing involves the physical testing of each and every component before it enters into service. Considering the proof test data as part of the RBDO process allows for improvement of the original design, such as weight savings, while preserving high reliability levels. Composite Over-Wrapped Pressure Vessels (COPV) is used as an example application of achieving weight savings while maintaining high reliability levels. COPVs are light structures used to store pressurized fluids in space shuttles, the international space station and other applications where they are maintained at high pressure for extended periods of time. Given that each and every COPV used in spacecraft is proof tested before entering service and any weight savings on a spacecraft results in significant cost savings, this thesis put forward an application of RBDO that accounts for proof test data in the design of a COPV. The method developed in this thesis shows that, while maintaining high levels of reliability, significant weight savings can be achieved by including proof test data in the design process. Also, the method enables a designer to have control over the magnitude of the proof test, making it possible to also design the proof test itself depending on the desired level of reliability for passing the proof test. The implementation of the method is discussed in detail. The evaluation of the reliability was based on the First Order Reliability Method (FORM) supported by Monte Carlo Simulation. Also, the method is implemented in a versatile way that allows the use of analytical as well as numerical (in the form of finite element) models. Results show that additional weight savings can be achieved by the inclusion of proof test data in the design process.
AFRIKAANSE OPSOMMING: Onlangse studies het getoon dat die gebruik van ontwerp spesifieke proeftoets data in betroubaarheids gebaseerde optimering (BGO) kan lei tot 'n verbeterde ontwerp. BGO behels vele aspekte in die ontwerpsgebied. Die toevoeging van proeftoets data in ontwerpsoptimering bring te weë; die toetsing van 'n ontwerp en onderdele voor gebruik, die aangepaste en verbeterde ontwerp en gewig-besparing met handhawing van hoë betroubaarsheidsvlakke. 'n Praktiese toepassing van die BGO tegniek behels die ontwerp van drukvatte met saamgestelde materiaal bewapening. Die drukvatontwerp is 'n ligte struktuur wat gebruik word in die berging van hoë druk vloeistowwe in bv. in ruimtetuie, in die internasionale ruimtestasie en in ander toepassings waar hoë druk oor 'n tydperk verlang word. Elke drukvat met saamgestelde materiaal bewapening wat in ruimtevaartstelsels gebruik word, word geproeftoets voor gebruik. In ruimte stelselontwerp lei massa besparing tot 'n toename in loonvrag. Die tesis beskryf 'n optimeringsmetode soos ontwikkel en gebaseer op 'n BGO tegniek. Die metode word toegepas in die ontwerp van drukvatte met saamgestelde materiaal bewapening. Die resultate toon dat die gebruik van proeftoets data in massa besparing optimering onderhewig soos aan hoë betroubaarheidsvlakke moontlik is. Verdermeer, die metode laat ook ontwerpers toe om die proeftoetsvlak aan te pas om sodoende by ander betroubaarheidsvlakke te toets. In die tesis word die ontwikkeling en gebruik van die optimeringsmetode uiteengelê. Die evaluering van betroubaarheidsvlakke is gebaseer op 'n eerste orde betroubaarheids-tegniek wat geverifieer word met talle Monte Carlo simulasie resultate. Die metode is ook so geskep dat beide analitiese sowel as eindige element modelle gebruik kan word. Ten slotte, word 'n toepassing getoon waar resultate wys dat die gebruik van die optimeringsmetode met die insluiting van proeftoets data wel massa besparing kan oplewer.
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Composite Over-Wrapped Pressure Vessels (COPV)"

1

Alam, Shah, and Abhijeet Divekar. "Design Optimisation of Composite Overwrapped Pressure Vessel Through Finite Element Analysis." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71843.

Full text
Abstract:
COPVs are currently used at NASA to contain high-pressure fluids in propulsion, science experiments and life support applications. These COPVs have a significant weight advantage over all-metal vessels; but, as compared to all-metal vessels, COPVs require unique design, manufacturing, and test requirements. The most significant difference from metal pressure vessel designs is that COPVs involve a much more complex mechanical understanding due to the interplay between the composite overwrap and the inner liner. Often only limited analysis is performed to obtain an initial design, and then the design is refined through number of “build and burst” iterations. However, the cost in material and resources to fabricate multiple test specimens is extremely prohibitive. To avoid these high cost and time for build and burst iterations, FEA is often employed in an attempt to reduce the number of iterations required. FEA process becomes more of a design confirmation effort rather than a design iteration effort. In this research, we aimed to establish a detailed design optimization of a complete COPV through Finite Element simulation.
APA, Harvard, Vancouver, ISO, and other styles
2

Grant, Joseph, and Curtis Banks. "Strain measurements using FBG on composite over wrap pressure vessels (COPV) in stress rupture test." In The 14th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, edited by Kara J. Peters. SPIE, 2007. http://dx.doi.org/10.1117/12.723513.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Banerjee, Sourav, Piero Messidoro, Adriano Ferrarese, Shawn Beard, and Ritubarna Banerjee. "Structural Health Monitoring Technology for Aerospace Composite Propellant Tank." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-5235.

Full text
Abstract:
In this paper the experimental activities that were performed at Thales Alenia Space (TAS-I) System, Turin, Italy by Acellent Technologies Inc is presented. The final objective was defining a Vehicle / Vehicle Subsystem, built-in Health Management System which embeds self diagnosis and prognosis functions. Under this program a Composite Overwrapped Pressure Vessel (COPV) for space applications was monitored under pressure cycling (mechanical loading). The subscale demonstrator consisted of an aluminium metallic liner over wrapped by a CFRP layer. The metallic liner is seamless and manufactured by spin-forming. The liner material is aluminum AA6061 T6, with Yield Strength of 286 MPa, as declared by the bottle supplier (US Hydrospin); expected elongation to rupture is around 10%. The test was conducted for 3 days on a water filled COPV and at the end of three days the metal liner inside the propellant tank was cracked and caused water leakage. Acellent used a statistical data interpretation technique via feature extraction and data modeling approach to demonstrate that the system was able to generate the early alarm and also capable of localizing the damage which appeared at two hot spot locations.
APA, Harvard, Vancouver, ISO, and other styles
4

Schneider, Judy, Mark Dyess, Chad Hastings, James Patterson, Jared Noorda, and Thomas DeLay. "Lightweight Cryogenic Composit Over-wrapped Pressure Vessels (COPVS) for Launch Vehicle Applications." In 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-2148.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Brusa, Eugenio G. M., and Matteo Nobile. "Assessment of a Design Method for Composite Over-Wrapped Pressure Vessels for Hydrogen Storage." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95074.

Full text
Abstract:
Present work deals with over-wrapped composite pressure vessels, for hydrogen storage, with inner metallic liner, reinforced by outer carbon-epoxy laminate. It is built by filament winding and includes hoop and helical layers. A design procedure is assessed, by including: a preliminary netting analysis, a definition of composite layers, according to the theory of composite laminates, and further refined by FEM. Numerical model investigates material strength at burst pressure, computes auto-frettage pressure for liner and predicts fatigue life, in low cycle range. An industrial prototype was used as test case for the implementation and the preliminary validation of the proposed approach, by performing an optimization of the final layout of the whole over-wrapped composite vessel.
APA, Harvard, Vancouver, ISO, and other styles
6

Grant, J. "Optical sensing using fiber Bragg gratings for monitoring structural damage in composite over-wrapped pressure vessels." In Optics & Photonics 2005, edited by Francis T. Yu, Ruyan Guo, and Shizhuo Yin. SPIE, 2005. http://dx.doi.org/10.1117/12.620528.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Nunes, Joao P., Joao F. Silva, and Paulo J. Antunes. "Domestic Gas Cylinders Manufactured by Using a Composite Hybrid Steel Glass Reinforced Thermoplastic Matrix Solution." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25822.

Full text
Abstract:
The use of polymer composites allows effectively minimizing the weight, improving aesthetics, promoting handling, and also increasing the vessels mechanical, impact, and corrosion behavior [1]. Since filament winding technique appeared in late 1950s as very suitable production process to manufacture rotationally advanced structures [2–7], such as rocket engine cases, an extensive work has been carried out on the development of new processing possibilities. The improvements occurred until the 1980s as consequence of the computer evolution, give finally birth to the modern polar and multi-axle CNC-controlled filament winding machines that are easily integrated in CAD/CAM environments and allow process almost all exotic shapes with very high accurate fiber placement, speed, and quality control [8]. In this work, continuous glass/polypropylene (GF/PP) commingled fiber tapes were employed to produce wrapped pressure gas vessels for domestic applications by using filament winding. The vessel structural-wall was built using a hybrid solution consisting in a very thin steel liner over wrapped by the filament wounded GF/PP commingled fiber tape layers. FEM analysis was used to evaluate if the composite gas pressure vessel based on the hybrid solution (steel liner plus glass fiber reinforced thermoplastic) is capable to withstand the following pressure requirements: the metallic liner, alone, a minimum burst pressure of 4MPa and whole hybrid composite vessel minima internal test and burst pressures of 3MPa and 6.75 MPa, respectively. Finally, gas pressure vessel prototypes manufactured in industrial conditions were submitted to burst pressure and electrostatic tests to prove that they accomplish all European standard strength requirements. The electrostatic tests were made to evaluate the risk of dangerous electrostatic discharges occurring in the worst service conditions described in the Annex C of the EN 13463-1 standard [9]. Two types of electrostatic discharge risks were evaluated: i) possibility of the brush discharge occur from the external non-conductive surface of the composite cylinders due to the accumulation of electrical charges generated in service by rubbing or contact of the cylinder with a high voltage power supply, and ii) possibility of the brush discharge occur through the gas cylinder metallic conductive filling valve due to the accumulation of electrical charges on the internal steel liner as result from the normal service cylinder shaking.
APA, Harvard, Vancouver, ISO, and other styles
8

John, Sebastian, René Eisermann, and Georg Mair. "Application of an Experimental Modal Analysis on Composite Pressure Vessels for Monitoring Prestress Conditions." In ASME 2018 Noise Control and Acoustics Division Session presented at INTERNOISE 2018. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ncad2018-6143.

Full text
Abstract:
Due to high specific stiffness, fibre reinforced plastics are the dominant material group for the design of mobile pressure vessels. At the Federal Institute for Materials Research and Testing (BAM) aging process of composite pressure vessels is studied to be able to give more accurate lifetime predictions in future. Investigations are based on type III breathing air cylinders consisting of an aluminium tank which is fully wrapped with carbon fibre reinforced plastics. The goal is to detect changes of residual stresses over life time which directly affect fatigue strength. Within this paper an approach is presented to monitor residual stresses via an experimental modal analysis (EMA). First, the influence of changed stress conditions on modal parameters is analysed via a numerical study. Secondly, a test bench for an EMA is set up. To be able to analyse cylinders of different prestress condition, several specimens are prestress modified via high-temperature and high-pressure treatment. During the modification processes, specimens are monitored via optical fibres to control prestress modifications. Through experimental measurements of the modified specimens via EMA changes in prestressing can be detected. Finally, the validity and accuracy of the EMA is evaluated critically by comparing all numerically and experimentally obtained data.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography