The Experts below are selected from a list of 291 Experts worldwide ranked by ideXlab platform
Sm Aceves - One of the best experts on this subject based on the ideXlab platform.
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high density automotive hydrogen storage with cryogenic capable Pressure Vessels
International Journal of Hydrogen Energy, 2010Co-Authors: Sm Aceves, Francisco Espinosaloza, Elias Ledesmaorozco, Timothy O Ross, Andrew H Weisberg, Tobias Brunner, Oliver KircherAbstract:Abstract LLNL is developing cryogenic capable Pressure Vessels with thermal endurance 5–10 times greater than conventional liquid hydrogen (LH 2 ) tanks that can eliminate evaporative losses in routine usage of (L)H 2 automobiles. In a joint effort BMW is working on a proof of concept for a first automotive cryo-compressed hydrogen storage system that can fulfill automotive requirements on system performance, life cycle, safety and cost. Cryogenic Pressure Vessels can be fueled with ambient temperature compressed gaseous hydrogen (CGH 2 ), LH 2 or cryogenic hydrogen at elevated supercritical Pressure (cryo-compressed hydrogen, CcH 2 ). When filled with LH 2 or CcH 2 , these Vessels contain 2–3 times more fuel than conventional ambient temperature compressed H 2 Vessels. LLNL has demonstrated fueling with LH 2 onboard two vehicles. The generation 2 vessel, installed onboard an H 2 -powered Toyota Prius and fueled with LH 2 demonstrated the longest unrefueled driving distance and the longest cryogenic H 2 hold time without evaporative losses. A third generation vessel will be installed, reducing weight and volume by minimizing insulation thickness while still providing acceptable thermal endurance. Based on its long experience with cryogenic hydrogen storage, BMW has developed its cryo-compressed hydrogen storage concept, which is now undergoing a thorough system and component validation to prove compliance with automotive requirements before it can be demonstrated in a BMW test vehicle.
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Vehicular storage of hydrogen in insulated Pressure Vessels
International Journal of Hydrogen Energy, 2006Co-Authors: Sm Aceves, Gene D. Berry, Joel Martinez-frias, Francisco Espinosa-lozaAbstract:Abstract This paper describes an alternative technology for storing hydrogen fuel onboard vehicles. Insulated Pressure Vessels are cryogenic capable Vessels that can accept cryogenic liquid hydrogen, cryogenic compressed gas or compressed hydrogen gas at ambient temperature. Insulated Pressure Vessels offer advantages over conventional storage approaches. Insulated Pressure Vessels are more compact and require less carbon fiber than compressed hydrogen Vessels. They have lower evaporative losses than liquid hydrogen tanks, and are lighter than metal hydrides. The paper outlines the advantages of insulated Pressure Vessels and describes the experimental and analytical work conducted to verify that insulated Pressure Vessels can be safely used for vehicular hydrogen storage. Insulated Pressure Vessels have successfully completed a series of certification tests. A series of tests have been selected as a starting point toward developing a certification procedure. An insulated Pressure vessel has been installed in a hydrogen fueled truck and tested over a six month period.
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Vehicular Storage of Hydrogen in Insulated Pressure Vessels
2005Co-Authors: Sm Aceves, Gene D. Berry, Joel Martinez-frias, Francisco Espinosa-lozaAbstract:This paper describes the development of an alternative technology for storing hydrogen fuel onboard automobiles. Insulated Pressure Vessels are cryogenic-capable Pressure Vessels that can accept cryogenic liquid fuel, cryogenic compressed gas or compressed gas at ambient temperature. Insulated Pressure Vessels offer advantages over conventional H{sub 2} storage approaches. Insulated Pressure Vessels are more compact and require less carbon fiber than GH{sub 2} Vessels. They have lower evaporative losses than LH{sub 2} tanks, and are much lighter than metal hydrides. After outlining the advantages of hydrogen fuel and insulated Pressure Vessels, the paper describes the experimental and analytical work conducted to verify that insulated Pressure Vessels can be used safely for vehicular H{sub 2} storage. The paper describes tests that have been conducted to evaluate the safety of insulated Pressure Vessels. Insulated Pressure Vessels have successfully completed a series of DOT, ISO and SAE certification tests. A draft procedure for insulated Pressure vessel certification has been generated to assist in a future commercialization of this technology. An insulated Pressure vessel has been installed in a hydrogen fueled truck and it is currently being subjected to extensive testing.
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analytical and experimental evaluation of insulated Pressure Vessels for cryogenic hydrogen storage
International Journal of Hydrogen Energy, 2000Co-Authors: Sm Aceves, Joel Martinezfrias, O GarciavillazanaAbstract:Abstract Insulated Pressure Vessels are cryogenic-capable Pressure Vessels that can be fueled with liquid hydrogen (LH2) or ambient-temperature compressed hydrogen (CH2). These Vessels offer the advantages of LH2 tanks (low weight and volume), with reduced disadvantages (fuel flexibility, lower energy requirement for hydrogen liquefaction and reduced evaporative losses). The work described here is directed to verify that commercially available Pressure Vessels can be safely used to store LH2. The use of commercially available Pressure Vessels significantly reduces the cost and complexity of the insulated Pressure vessel development effort. This paper describes a series of tests that have been done with aluminum-lined, fiber-wrapped Vessels to evaluate the damage caused by low temperature operation. All analyses and experiments to date indicate that no significant damage has resulted. Required future tests are described, which will prove that no technical barriers exist to the safe use of aluminum-fiber Vessels at cryogenic temperatures.
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Evaluation of insulated Pressure Vessels for cryogenic hydrogen storage
1999Co-Authors: Sm Aceves, O Garcia-villazana, Joel Martinez-friasAbstract:This paper presents an analytical and experimental evaluation of the applicability of insulated Pressure Vessels for hydrogen-fueled light-duty vehicles. Insulated Pressure Vessels are cryogenic-capable Pressure Vessels that can be fueled with liquid hydrogen (LH?) or ambient-temperature compressed hydrogen (CH2). Insulated Pressure Vessels offer the advantages of liquid hydrogen tanks (low weight and volume), with reduced disadvantages (lower energy requirement for hydrogen liquefaction and reduced evaporative losses). The purpose of this work is to verify that commercially available aluminum-lined, fiber- wrapped Vessels can be used for cryogenic hydrogen storage. The paper reports on previous and ongoing tests and analyses that have the purpose of improving the system design and assure its safety.
Chenghuan Wang - One of the best experts on this subject based on the ideXlab platform.
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optimum design of dome contour for filament wound composite Pressure Vessels based on a shape factor
Composite Structures, 2002Co-Authors: Chochung Liang, Hungwen Chen, Chenghuan WangAbstract:Abstract Filament-wound composite Pressure Vessels are an important type of high-Pressure container that is widely applied in the commercial and aerospace industries. This study investigates the optimum design of dome contours for filament-wound composite Pressure Vessels, subjected to geometrical limitations, winding condition, and the Tsai–Wu failure criterion and maximizing shape factor, the feasible direction method being employed. An actual design example, presented by Fukunaga et al. [19] , is adopted to study the optimum dome contour using the present method. Results reveal that the dome contours using the present method, Fukunaga et al.’s method and the netting method can be approximated using elliptic curves, and that the depth is the major parameter for optimizing the design of dome contour, and the dome, designed using the present method has stronger structure and greater internal volume than those designed using other approaches. Results reveal that the present method is usable for the optimum design of dome contours for filament-wound composite Pressure Vessels.
Chochung Liang - One of the best experts on this subject based on the ideXlab platform.
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optimum design of dome contour for filament wound composite Pressure Vessels based on a shape factor
Composite Structures, 2002Co-Authors: Chochung Liang, Hungwen Chen, Chenghuan WangAbstract:Abstract Filament-wound composite Pressure Vessels are an important type of high-Pressure container that is widely applied in the commercial and aerospace industries. This study investigates the optimum design of dome contours for filament-wound composite Pressure Vessels, subjected to geometrical limitations, winding condition, and the Tsai–Wu failure criterion and maximizing shape factor, the feasible direction method being employed. An actual design example, presented by Fukunaga et al. [19] , is adopted to study the optimum dome contour using the present method. Results reveal that the dome contours using the present method, Fukunaga et al.’s method and the netting method can be approximated using elliptic curves, and that the depth is the major parameter for optimizing the design of dome contour, and the dome, designed using the present method has stronger structure and greater internal volume than those designed using other approaches. Results reveal that the present method is usable for the optimum design of dome contours for filament-wound composite Pressure Vessels.
Anthony R Bunsell - One of the best experts on this subject based on the ideXlab platform.
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Health monitoring of high performance composite Pressure Vessels,
2018Co-Authors: Anthony R Bunsell, Alain ThionnetAbstract:The most important form of damage in carbon fiber reinforced composite Pressure Vessels is the failure of the fibers however the rate of fiber failure is controlled by the viscoelastic nature of the matrix, which determines overall in-service lifetimes. This type of damage is very different from that encountered with metal Pressure Vessels and requires a detailed understanding in order to ensure reliability. Innovative proof testing methods based on these processes are necessary. The damage processes and the means of quantifying them are discussed. Their reliability under Pressure over periods of decades is analyzed. Intrinsic safety factors linked directly to the properties of the composite components are proposed.
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Intrinsic mechanisms limiting the use of carbon fiber composite Pressure Vessels
Journal of Pressure Vessel Technology, 2016Co-Authors: Alain Thionnet, Anthony R Bunsell, Heng-yi ChouAbstract:The viscoelastic properties of the resins used in carbon fiber composite Pressure Vessels introduce time effects which allow damage processes to develop during use under load. A detailed understanding of these processes has been achieved through both experimental and theoretical studies on flat unidirectional specimens and with comparisons with the behavior of Pressure Vessels. Under steady Pressures, the relaxation of the resin in the vicinity of earlier fiber breaks gradually increases the sustained stress in neighboring intact fibers and some eventually break. The rate of fiber failure has been modeled based only on physical criteria and shown to accurately predict fiber failure leading to composite failure, as seen in earlier studies. Under monotonic loading, failure is seen to be initiated when the earlier random nature of breaks changes so as to produce clusters of fiber breaks. Under steady loading, at loads less than that producing monotonic failure, greater damage can be sustained without immediately inducing composite failure. However, if the load level is high enough failure does eventually occur. It has been shown, however, that below a certain load level the probability of failure reduces asymptotically to zero. This allows a minimum safety factor to be quantitatively determined taking into account the intrinsic nature of the composite although other factors such as accidental damage or manufacturing variations need to be assessed before such a factor can be proposed as standards for Pressure Vessels.
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acoustic emission analysis of composite Pressure Vessels under constant and cyclic Pressure
Composites Part A-applied Science and Manufacturing, 2015Co-Authors: H Y Chou, M K Bannister, Adrian P. Mouritz, Anthony R BunsellAbstract:The use of acoustic emission (AE) for the detection of damage in carbon fibre composite Pressure Vessels was evaluated for constant and cyclic internal gas Pressure loading conditions. AE was capable of monitoring the initiation and accumulation of damage events in a composite Pressure vessel (CPVs), although it was not possible to reliably distinguish carbon fibre breakage from other microscopic damage events (e.g. matrix cracks, fibre/matrix interfacial cracks). AE tests performed on the carbon fibre laminate used as the skin of Pressure Vessels revealed that the development of damage is highly variable under constant Pressure, with large differences in the rupture life and acoustic emission events at final failure. Numerical analysis of the skin laminate under constant tensile stress revealed that the high variability in the stress rupture life is due mainly to the stochastic behaviour of the carbon fibre rupture process.
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The control of the residual lifetimes of carbon fibre-reinforced composite Pressure Vessels
2015Co-Authors: Anthony R Bunsell, Alain ThionnetAbstract:The understanding of the degradation of carbon fibre composites, with emphasis on the use of these composites in filament-wound Pressure Vessels, is explored. Earlier studies by many researchers have led to a general appreciation of the mechanisms involved; however, only recently have both computational power and experimental techniques become sufficiently developed to allow for the use of quantitative analyses. It is shown that damage is controlled by fibre failure, and that initially this occurs randomly within the structure. In monotonic loading, the development of clusters of fibre breaks causes rapid failure; however, under maintained loads the kinetics of damage evolution are markedly different, and final strength depends on the rate of loading. The results have direct implications for the use of composite Pressure Vessels, suggesting that their design and testing can be adapted to ensure long-term reliability. The ability to quantify damage accumulation in carbon fibre–composite Pressure Vessels allows for their intrinsic safety factors to be postulated.
H Y Chou - One of the best experts on this subject based on the ideXlab platform.
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acoustic emission analysis of composite Pressure Vessels under constant and cyclic Pressure
Composites Part A-applied Science and Manufacturing, 2015Co-Authors: H Y Chou, M K Bannister, Adrian P. Mouritz, Anthony R BunsellAbstract:The use of acoustic emission (AE) for the detection of damage in carbon fibre composite Pressure Vessels was evaluated for constant and cyclic internal gas Pressure loading conditions. AE was capable of monitoring the initiation and accumulation of damage events in a composite Pressure vessel (CPVs), although it was not possible to reliably distinguish carbon fibre breakage from other microscopic damage events (e.g. matrix cracks, fibre/matrix interfacial cracks). AE tests performed on the carbon fibre laminate used as the skin of Pressure Vessels revealed that the development of damage is highly variable under constant Pressure, with large differences in the rupture life and acoustic emission events at final failure. Numerical analysis of the skin laminate under constant tensile stress revealed that the high variability in the stress rupture life is due mainly to the stochastic behaviour of the carbon fibre rupture process.
