Relevant bibliographies by topics / Thick-walled vessel

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Thick-walled vessel'

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

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Journal articles on the topic "Thick-walled vessel"

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Parker, A. P., and X. Huang. "Autofrettage and Reautofrettage of a Spherical Pressure Vessel." Journal of Pressure Vessel Technology 129, no. 1 (March 10, 2006): 83–88. http://dx.doi.org/10.1115/1.2389020.

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There is a numerical procedure for modeling autofrettage of thick-walled cylinders that incorporates the Bauschinger effect as a function of prior plastic strain and Von Mises’ yield criterion. In this paper the numerical procedure is extended to solve the analogous problem of a spherical, thick walled steel vessel. An equivalent new analytical solution for the case of a spherical vessel is also formulated. The analytical and numerical solutions are shown to be in close agreement. It is demonstrated numerically that a reautofrettage procedure, previously proposed for cylindrical vessels, may be extremely beneficial for spherical vessels. Additional commentary is provided on the limitations of certain analytic solutions.
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Altenbach, H., GI Lvov, K. Naumenko, and V. Okorokov. "Consideration of damage in the analysis of autofrettage of thick-walled pressure vessels." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 20 (August 9, 2016): 3585–93. http://dx.doi.org/10.1177/0954406215615908.

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In this study, the influence of material damage and the Bauschinger effect on the autofrettage of thick-walled pressure vessels is investigated. Constitutive equations for the elasto-plastic deformation and damage processes are presented. Boundary value problems for a thick-walled cylinder and for a thick-walled sphere of constant thickness are formulated. Computations are preformed to find the optimum autofrettage pressure, for which the equivalent stresses in the vessel take the minimum value under process conditions. Furthermore, residual stress fields after the autofrettage are analyzed. The results show that the Bauschinger effect and damage lead to essential reduction of favorable residual stresses.
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Moghadam, J. S. M., Hamid Ekhteraiee Toosi, and S. A. Razavi. "Investigating the Effect of Internal Pressure and Thickness of Thick-Walled Cylindrical Vessels on the Ratcheting Strains under Compressive Cycling Loading Using the Quasi-Creep Method." Mapta Journal of Mechanical and Industrial Engineering (MJMIE) 5, no. 2 (July 22, 2021): 14–22. http://dx.doi.org/10.33544/mjmie.v5i2.173.

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Thick-walled vessels have many applications in military, chemical, and aerospace industries and also in nuclear facilities. Increasing the internal pressure inside these vessels can take some of the layers of the vessel into the plastic zone. If this happens several times, we will see the accumulation of plastic strains called ratcheting. This paper assumes that the thick-walled vessel is subjected to a cyclic internal pressure between zero and a maximum value. In order to analyze this phenomenon, first, we present the quasi-creep method, and then we validate this method using the finite element Abaqus Software based on the combined hardening model. Then we employ this method to evaluate the effect of internal pressure and thickness of the vessel on the amount of ratcheting strains in different cycles. In the end, the results of this research and the accuracy and speed of the quasi-creep method are stated.
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Chaaban, A., and M. Jutras. "Static Analysis of Buttress Threads Using the Finite Element Method." Journal of Pressure Vessel Technology 114, no. 2 (May 1, 1992): 209–12. http://dx.doi.org/10.1115/1.2929031.

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The finite element method has been used to investigate the stress field in threaded end closures of thick-walled high pressure vessels. A set of elastic analyses of vessels with 5, 8, 11, 15, 20 and 25 standard Buttress threads was used to propose a method for predicting the load distribution along the length of the thread. Root stress index factors in the region of the first three active threads are also included. The results of the present work contribute to the development of the new division of the ASME Pressure Vessel Code which is related to thick-walled high pressure vessels.
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Kobayashi, Satoshi, Mari Kawahara, and Shinji Ogihara. "408 Stress analysis of FW-CFRP thick-walled vessel." Proceedings of the Materials and processing conference 2007.15 (2007): 253–54. http://dx.doi.org/10.1299/jsmemp.2007.15.253.

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Ashworth, Vanessa E. T. M., and Gracielza Dos Santos. "Wood Anatomy of Four Californian Mistletoe Species (Phoradendron, Viscaceae)." IAWA Journal 18, no. 3 (1997): 229–45. http://dx.doi.org/10.1163/22941932-90001486.

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Secondary xylem characteristics were compared in four species of Phoradendron Nutt. (Viscaceae) native to California. All have extremely short, thick-walled vessel elements with simple perforation plates. They also share high vessel density, radial vessel arrangement, thick-walled fibres, and multiseriate, heterocellular rays. The fibres show considerable intrusive growth. Features of the vessel elements (i.e. vessel dimensions, arrangement, type of wall sculpturing) and calcium oxalate crystals in the ray parenchyma cells are useful diagnostic traits to separate species. Grooved vessel walls are shared by the morphologically similar P. villosum and P. macrophyllum. Differences between these two species may reflect contrasting drought response strategies pursued by respective hosts. Vulnerability and mesomorphy ratios of the wood of P. californicum are higher than those of P. pauciflorum and P. macrophyllum. Phoradendron pauciflorum has the most xeromorphic wood of the four species studied.
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Koh, S. K., and R. I. Stephens. "Fatigue Life Prediction of an Autofrettaged Thick-Walled Pressure Vessel With an External Groove." Journal of Pressure Vessel Technology 113, no. 3 (August 1, 1991): 368–74. http://dx.doi.org/10.1115/1.2928768.

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An autofrettaged thick-walled pressure vessel with an external groove subjected to a pulsating internal pressure can have fatigue failures at the external groove root due to the combination of tensile autofrettage residual stress, operating stress, and stress concentration. To predict the fatigue life of the autofrettaged thick-walled pressure vessel with an external groove, the local strain approach was applied. The residual stress distribution due to autofrettage and the operating stress distribution due to internal pressure were determined using finite element analysis which resulted in theoretical stress concentration factors. To account for the mean stress effects on the fatigue life prediction of the pressure vessel, low-cycle fatigue behavior with several strain ratios was obtained using smooth axial specimens taken from the ASTM A723 thick-walled steel pressure vessel. Fatigue life predictions were made by incorporating the local strains determined from the linear rule and Neuber’s rule and the Morrow and SWT mean stress parameters determined from low-cycle fatigue tests. The predicted fatigue lives were within factors of 2 to 4, compared to simulated experimental fatigue lives based upon fatigue cracks of 2.5 mm in length. These procedures appear to be realistic for evaluating fatigue lives for this complex pressure vessel.
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Kholdi, Mohsen, Abbas Loghman, Hossein Ashrafi, and Mohammad Arefi. "Analysis of thick-walled spherical shells subjected to external pressure: Elastoplastic and residual stress analysis." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 1 (October 21, 2019): 186–97. http://dx.doi.org/10.1177/1464420719882958.

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When cylindrical and spherical vessels are subjected to the internal pressure, tensile tangential stresses are created throughout the thickness, the maximum of which are located at the inner surface of the vessels. To improve the performance of these vessels, autofrettage process has been devised to produce beneficial compressive residual stresses at the inner part of such vessels. The question arises whether the process such as autofrettage can be useful for vessels such as submarines or other thick walled tanks, which are used in deep sea waters and, therefore, subjected to high external hydrostatic pressure causing both radial and tangential stresses to be compressive across the thickness. On the other hand, is the residual stresses created by unloading from an external pressure beyond elastic limit beneficial and enhance their performances? In this study, elastoplastic and residual stresses in a thick-walled spherical vessel under external hydrostatic pressure has been investigated. The material behavior is considered to be elastic-perfectly plastic. Von Misses yield criterion is used to obtain initial yield point and for the ideal elastoplastic regime analytical relations are presented. It has been found that by applying external hydrostatic pressure yielding process will start from inside of the sphere. Finally after unloading, residual tensile stresses are created at the inner part of the vessel which is useful for the vessel. The residual stresses and the condition of reverse yielding is studied in this paper.
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Moini, Hossein, and Thomas P. Mitchell. "Stress analysis of a thick-walled pressure vessel nozzle junction." International Journal of Pressure Vessels and Piping 46, no. 1 (January 1991): 67–74. http://dx.doi.org/10.1016/0308-0161(91)90069-e.

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Maleki, M., G. H. Farrahi, B. Haghpanah Jahromi, and E. Hosseinian. "Residual stress analysis of autofrettaged thick-walled spherical pressure vessel." International Journal of Pressure Vessels and Piping 87, no. 7 (July 2010): 396–401. http://dx.doi.org/10.1016/j.ijpvp.2010.04.002.

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Dissertations / Theses on the topic "Thick-walled vessel"

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McKeon, Peter. "A fundamental study to enable ultrasonic structural health monitoring of a thick-walled composite over-wrapped pressure vessel." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54308.

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A structural health monitoring system is desired to monitor the integrity of cylindrical, multi-layer carbon over-wrapped pressure vessels intended to house hydrogen at high pressures. In order to develop the system based on ultrasonic guided wave technology, the interaction between ultrasonic guided waves and defect types of interest must be understood. Finite element models in two and three dimensions are developed to predict guided wave motion in the reservoirs. Key parameters are optimized including frequency range, excited modes, detected modes, and transducer dimensions. A novel baseline subtraction technique in the frequency wavenumber domain is presented to increase lower level detection limits. Some experiments are carried out to corroborate the findings in the finite element environment.
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Blaha, Jakub. "Výpočtová analýza zbytkových napětí u autofretovaných vysokotlakých zásobníků paliva." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231712.

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The master‘s thesis is aimed on numerical simulation of autofrettage of high pressure fuel vessel – rail in Common Rail system. First there is described Chaboche model, which is later used for simulation of autofrettage. There are described different approaches which can be used to obtain sufficient material model. Then there is observed influence of these different approaches on stress state of rail within the process of autofrettage. Suitability of Chaboche model for autofrettage and re-autofrettage simulations is assessed by comparing with more complex Jiang model. In the end there is a study of influence of autofrettage pressure on different properties, especially on residual stresses.
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Masu, Leonard Mbevi. "The effect of cross bore geometry on the strength of pressure vessels." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369175.

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Rojek, Jan. "Effect of voids in thick-walled pressure vessels : Experimental observations and numerical modelling." Thesis, Université Paris sciences et lettres, 2020. http://www.theses.fr/2020UPSLM015.

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Dans cette thèse, on analyse l'effet de la porosité sur le comportement mécanique d'un matériau composite à fibres de carbone utilisé dans le cadre d'applications à hautes performances. Les réservoirs hyperbare destinés au stockage de l'hydrogène en sont un exemple. Du fait de leur fabrication par enroulement filamentaire, ces structures à parois épaisses présentent des taux de porosité parfois très élevés. La conséquence de telles porosités sur la durabilité des réservoirs et plus largement sur des structures composites chargées de manière multi-axiale est très peu documentée. Les travaux présentés ici s'inscrivent par ailleurs dans le développement d'un modèle existant à MINES ParisTech et ayant fait ses preuves pour prédire la résistance de composites unidirectionnels. Il s'agit ici de perfectionner ce modèle en intégrant de nouveaux facteurs comme les porosités. Des observations (tomographie aux rayons X et microscopie optique) d'un réservoir sont réalisées afin de caractériser les vides et leur distribution au sein de la structure. En parallèle, une étude expérimentale est conduite sur des éprouvettes à différents taux de porosité. La résistance de ces éprouvettes, chargées simultanément en traction longitudinale et compression transverse, est évaluée grace à un système expérimental spécialement conçu. A des échelles encore plus fines, des essais sont réalisés sur des échantillons d'époxy entaillés pour caractériser la croissance des cavités microscopiques et le comportement mécanique de la résine sous un état des contraintes multi-axial. Toutes ces données expérimentales sont ensuite exploitées et intégrées dans le modèle numérique afin de simuler le comportement à rupture d'un réservoir à parois épaisses
The topic of this thesis is the influence of voids on the mechanical properties of carbon fibre reinforced polymers used in high performance applications, such as pressure vessels for hydrogen storage. Manufactured through filament winding, these thick-walled structures can show a significant void content. The effect of these voids on the strength of pressure vessels and, more in general, on the strength of composite structures subjected to multiaxial loads, is not thoroughly understood. The work presented in this thesis is carried out in the context of an existing model of tensile failure of unidirectional composites developed at MINES ParisTech. The objective of the work presented here is to take into account additional factors, such as void content. X-ray tomography and optical microscopy observations are carried out to characterize voids in a carbon-epoxy pressure vessel. In another experimental study, mechanical tests are performed on carbon-epoxy specimens with different levels of void content. The influence of a biaxial load (longitudinal tension and through-thickness compression) is evaluated using a custom-designed experimental setup.At the microscopic scale, tests on notched epoxy specimens are carried out to investigate microscopic void growth and the mechanical behaviour of the resin under a multiaxial stress state. Finally, a numerical approach to modelling failure of a thick-walled cylinder is proposed in the framework of the multiscale fibre break model, taking into account the experimental observations
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Komoráš, Miroslav. "Pulsace toku kapaliny v pružné trubici." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401537.

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This master’s thesis is dealing with analysis of fluid flow pulse in a flexible tube representing e.g. an artery in a human body. In ANSYS program, 3D simulations were performed, and these are so-called interrelated FSI analysis. In Maple software, 1D simulations of fluid flow in the tube were performed for various thin-walled and thick-walled variants. The aim is using these programs to determine the flow rates and pressures in the tube, its wall deformation and stress. Therefore, the theoretical part deals mainly with basic equations of flow dynamics, linear and nonlinear models and rotationally symmetric vessels. In the computational part are described individual procedures in the mentioned programs.
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Nziu, P. K. "Optimal geometric configuration of a cross bore in high pressure vessels." Thesis, 2018. http://hdl.handle.net/10352/414.

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M.Tech (Department of Mechanical Engineering, Faculty of Engineering and Technology), Vaal University of Technology.
The purpose of this study was to develop analytical and numerical solutions to be used in the design of thick walled high pressure vessels for optimal location of a cross bore. In addition, the effects of internally applied combined thermo-mechanical loading on Stress Concentration Factor (SCF) on these vessels, was also evaluated. An analytical solution, to predict principal stresses on radial circular cross bore, was developed. The developed analytical solution was verified using finite element analysis methods. An optimisation process, using finite element analysis, was further done to determine the optimal combination of the major cross bore geometry that affect stress concentration. The cross bore geometries that were studied included the size, shape, location, obliquity and thickness ratio. The geometrically optimised cross bore was then subjected to combined thermo-mechanical loading to determine the resulting stress concentration effects. A total of 169 finite element part models were created and analysed. Seven thick walled cylinders having either circular or elliptical shaped cross bore positioned at radial, offset or and inclined were investigated. The analytical solution developed correctly predicted all the radial stresses at the intersection of the cross bore and main bore. However, out of 35 studied models, this analytical solution predicted the magnitude of hoop stresses in 9 models and that of axial stresses in 15 models correctly. The lowest SCF given by the radial circular cross bore was 2.84. Whereas, the SCF due to offsetting of the same cross bore size reduced to 2.31. Radial elliptical shaped cross bore gave the overall lowest SCF at 1.73. In contrast, offsetting of the same elliptical shaped cross bore resulted in tremendous increase in SCF magnitude exceeding 1.971. Additionally, the magnitudes of SCF were observed to increase whenever the circular offset cross bores were inclined along the RZ axis of the cylinder. The hoop stress due to internally applied combined thermo-mechanical loading increased gradually with increase in temperature until it reached a maximum value after which it began to fall sharply. In contrast, the corresponding SCF reduced gradually with increase in temperature until it reached a uniform steady state. After which, any further increase in temperature had insignificant change in stress concentration factor. The optimal SCF magnitude due to combined thermo-mechanical loading was 1.43. This SCF magnitude was slightly lower than that due to the pressure load acting alone.
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Book chapters on the topic "Thick-walled vessel"

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Anand, Lallit, and Sanjay Govindjee. "Some classical problems in rate-independent plasticity." In Continuum Mechanics of Solids, 434–59. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198864721.003.0024.

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This chapter presents analytical solutions to some classical problems in rate-independent plasticity. Solutions are presented for the elastic-plastic torsion of a round bar, including spring back; for the elastic-plastic response of a thick-walled spherical pressure vessel, including initial yield, partial yield, full yield, and unloading; for the incompressible elastic-plastic response of a plane-strain thick-walled cylindrical pressure vessel, including initial yield, partial yield, and full yield.
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Atkinson, Martin E. "The circulatory system." In Anatomy for Dental Students. Oxford University Press, 2013. http://dx.doi.org/10.1093/oso/9780199234462.003.0010.

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The circulatory system has two interrelated, but distinct parts, the cardiovascular system which circulates blood around the body and the lymphatic system which returns excess fluid from the tissues to the cardiovascular system. The function of the cardiovascular system is to oxygenate blood in the lungs and distribute the oxygenated blood to the tissues of the body. At the same time, carbon dioxide that accumulates as a result of metabolism of oxygen within the tissues is removed from the tissues and transported to the lungs where it is released from the blood and exhaled. The cardiovascular system comprises the heart, a muscular pump, and blood vessels. Arteries convey blood to thin-walled capillaries where gaseous exchange takes place and veins return blood to the heart. The cardiovascular system is often described as two parallel systems; the pulmonary circulation moves blood through the lungs and the systemic circulation circulates blood through the body. Trace the circulation of blood through the two systems in Figure 4.1 by following the arrows from the side of the heart coloured red. It follows a figure-of-eight (8) pattern with the two systems interlinked at the heart, the upper loop representing the pulmonary circulation and the lower loop the systemic circulation. The heart is a muscular pump driving blood at considerable pressure through arteries that get progressively smaller in both circulations until capillaries are reached. Arteries are sometimes dismissed as mere plumbing, but they play a vital role in regulating the blood flow through organs and tissues. Capillary walls are only one cell thick, allowing for the efficient diffusion of gases and small nutrient molecules to and from tissues. Waste gases and metabolites are also returned to the circulatory system through capillaries and these unite to form veins carrying blood under comparatively low pressure back to the heart. The heart comprises two muscular pumps arranged in parallel and beating in unison. As you can see in Figure 4.1, these two pumps are designated as the right and left sides of the heart. Each pump consists of two chambers, a thin-walled atrium that receives blood from one or other circulation and a thick-walled ventricle that ejects blood into the circulations.
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Loghman, A., and M. A. Wahab. "THERMOELASTOPLASTIC AND RESIDUAL STRESSES IN THICK-WALLED CYLINDRICAL PRESSURE VESSELS OF STRAIN HARDENING MATERIAL." In Advances in Engineering Plasticity and its Applications, 843–50. Elsevier, 1993. http://dx.doi.org/10.1016/b978-0-444-89991-0.50113-x.

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Clausmeyer, H., and H. Hantsch. "MANUFACTURE OF THICK-WALLED PRESSURE VESSELS IN PARTICULAR CONSIDERATION OF ADVANCED WELDING PROCESSES AND MEASURES FOR QUALITY ASSURANCE." In Design & Analysis, 1321–35. Elsevier, 1989. http://dx.doi.org/10.1016/b978-1-4832-8430-9.50128-3.

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Conference papers on the topic "Thick-walled vessel"

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Deng, Guide, Ping Xu, Jinyang Zheng, Yongjun Chen, Yongle Hu, Longmao Zhao, and Yuanyuan Ma. "Numerical Simulation of Blast Loadings on a Thick-Walled Cylindrical Vessel." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26499.

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Determining blast loadings on an explosion containment vessel (ECV) is the foundation to design the ECV. Explosion of TNT centrally located in a thick-walled cylindrical vessel and its impact on the cylinder was simulated using the explicit finite element code LS-DYNA. Blast loadings on the cylinder computed are in good agreement with the corresponding experimental results. Then wall thickness and yield stress of the cylinder were changed in the following simulation to investigate effect of shell deformation on blast loadings. It is revealed that shell deformation during the primary pulses of blast loadings is so slight that it has little influence on the blast loadings. Though the deformation may increase greatly after the primary pulses, the dynamic response of an ECV is mainly affected by the primary pulses. Therefore, decoupled analyses are appropriate, in which the shell of an ECV is treated as a rigid wall when determining blast loadings on it.
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Parker, Anthony P., and Xiaoping Huang. "Autofrettage of a Spherical Pressure Vessel." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26343.

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There is a numerical procedure for modeling autofrettage of thick-walled cylinders that incorporates Bauschinger effect as a function of prior plastic strain and Von Mises’ yield criterion. In this paper the numerical procedure is extended to solve the analogous problem of a spherical, thick walled steel vessel. An equivalent new analytical solution for the case of a spherical vessel is also formulated. The analytical and numerical solutions are shown to be in close agreement. It is demonstrated numerically that a re-autofrettage procedure, previously proposed for cylindrical vessels, may be extremely beneficial for spherical vessels. Additional commentary is provided on the limitations of certain analytic solutions.
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Troiano, E., A. P. Parker, and J. H. Izzo. "Influence and Modeling of Residual Stresses in Thick Walled Pressure Vessels With Through Holes." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78179.

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Thick walled pressure vessels are often autofrettaged in order to impart favorable near bore compressive residual stresses which can significantly increase the life of the vessels. These stresses can be imparted via a thermal shrink process in which there is no loss of residual stresses due to the Bauschinger Effect, or more economically with a mechanical swage or hydraulic overload process in which the Bauschinger Effect is present. In some cases these vessels have holes bored through the wall in order to take advantage of the escaping gasses for actuation of external peripherals associated with the vessel. These through holes, which can be angled or perpendicular to the centerline of the pressure vessel can significantly reduce the fatigue life of the vessel depending on the wall ratio of the vessel as well as the, angle of inclination of the hole to the centerline of the vessel. This study utilizes the classic stress based Paris Law fatigue life approach which takes into account the residual stresses as a function of radial location to assess the life of the vessel in the region of both configurations of through holes. It quantifies the concentration of stresses associated with the perpendicular and angled through wall holes, and the amount of pressure that actually enters the hole. The analysis is employed to ensure that the life within these through holes meets or exceeds the safe life of the vessel without holes which has been determined by assuming a log normal distribution from of a sample size of six with the 90% lower confidence bound on the 0.1th percentile of the population.
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Eggert, Rudolph J. "Design Variation Simulation of Thick-Walled Cylinders." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0059.

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Abstract Thick-walled cylinders exposed to high, static internal pressures may experience both elastic and plastic deformation. Primary design considerations include loads, geometry and material properties. However, variations in geometry and material properties due to conventional manufacturing processes, and variations of internal pressure due to actual usage patterns, propagate through the system resulting in off-design stresses and strains which may cause failure. These variations can be evaluated using probabilistic methods which are discussed in this paper. Von Mises-distortion energy yield theory is presented to predict elastic, plastic and residual stresses in thick-walled cylinders. The design variation simulation method using Monte Carlo simulation and available statistical information is used to design a pressure vessel for servo-hydraulic experiments. The use of autofrettage to induce favorable compressive stresses at the inner bore, thereby improving the margin of safety and overall reliability, is also presented.
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Troiano, E., J. H. Underwood, R. R. de Swardt, A. M. Venter, A. P. Parker, and C. Mossey. "3D Finite Element Modeling of the Swage Autofrettage Process Including the Bauschinger Effect." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26743.

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The autofrettage process is a method that produces tensile plastic deformation during the overloading of a pressure vessel which reverses and becomes compressive during unloading. This process produces favorable compressive residual hoop stresses at the bore of the pressure vessel, and results in an increase in the life of the component. In thick walled pressure vessels this process can be accomplished with either a hydraulic or mechanical overloading process. These processes produce different residual stress fields by their inherent nature. The Bauschinger effect, which is observed in most of the materials used in thick walled pressure vessels, is a phenomenon which results in lower reverse loading stresses than those predicted with the classic techniques of Hill and others. The phenomenon is a strong function of the amount of plastic strain during the initial loading of the pressure vessel and results in losses of reverse loading strength of up to 40% in A723 and HB7 steels. A quasi-static three dimensional axi-symmetric finite element model of the swage mandrel autofrettage process of a thick walled pressure vessel is presented in this work. It includes the results of several methodologies for predicting the reduced reverse loading stresses resulting from the Bauschinger effect. The FE results are then shown to compare favorably with neutron diffraction residual stress measurements and yield pressure tests.
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Kendall, David P. "Fatigue Crack Growth in Thick-Walled Cylinders With Straight-Fronted Cracks." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2276.

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This paper presents the results of a comparison of fatigue crack growth in pressurized, thick-walled cylinders containing initial, straight-fronted cracks. These cracks are at the bore surface and are in the radial-longitudinal plane. The crack growth is determined from stress intensity factors calculated by the method in Section VIII, Division 3 of the ASME Boiler and Pressure Vessel Code. It is also determined from stress intensity factors calculated by a method proposed by Andrasic and Parker in 1984. In spite of the very large difference between the values of stress intensity factor calculated by the two methods for deep cracks, there is little difference between the fatigue crack growth determined by the two methods.
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Li, Hongjun, Richard Johnston, and Donald Mackenzie. "Effect of Autofrettage in the Thick-Walled Cylinder With a Radial Cross-Bore." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26319.

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The effect of autofrettage on the stress level in thick-walled cylinders with a radial cross-bore is investigated by applying inelastic FEA with cyclic pressure loading. A macro is created in ANSYS to calculate the equivalent alternating stress intensity, Seq, based on the ASME Boiler and Pressure Vessel Code. The value of Seq is used to evaluate the fatigue life of the vessel. For a specific cyclic load level, a distinct optimum autofrettage pressure is identified by plotting autofrettage pressure against the number of cycles from design fatigue data. The fatigue life of the autofrettaged vessel with such an optimum pressure is significantly increased compared with the case where no autofrettage is used.
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8

Peters, Daniel T. "Effect of Blend Radius on Stress Concentration Factor of Crossbored Holes in Thick Walled Pressure Vessels." In ASME 2003 Pressure Vessels and Piping Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/pvp2003-1838.

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Many studies have been performed on the effect of stress concentration factor in thick walled cylinders caused by holes drilled to the wall perpendicular to the vessel ID, commonly called crossbores. Recent developments in FEA analysis and computer technology have allowed detailed analysis in their effect on the stresses in pressure vessels. This allows the reevaluation of many theories developed in the past. The following is a study of how applying a blend radius to the inside intersection of a vessel bore and a crossbore affects the stresses in vicinity of the hole and the stress concentrations developed near the hole.
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9

Troiano, E., J. H. Underwood, A. P. Parker, and C. Mossey. "Post Autofrettage Thermal Treatment and Its Effect on Re-Yielding of High Strength Pressure Vessel Steels." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-78132.

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The autofrettage process of a thick walled pressure vessel involves applying tensile plastic strain at the bore of the vessel which reverses during unloading and results in favorable compressive residual stresses at the bore and prolongs the fatigue life of the component. In thick walled pressure vessels this process can be accomplished with either a hydraulic or mechanical overloading process. The Bauschinger effect, which is observed in many of the materials used in thick walled pressure vessels, is a phenomenon which results in lower compressive residual stresses than those predicted with classic ideal isotropic hardening. The phenomenon is a strong function of the amount of prior tensile plastic strain. A novel idea which involves a multiple autofrettage process has been proposed by the present authors. This process requires a low temperature post autofrettage thermal treatment which effectively returns the material to its original yield conditions without affecting its residual stress state. Details of this low temperature thermal treatment are proprietary. A subsequent second autofrettage process generates a significantly lower amount of plastic strain during the tensile re-loading and results in higher compressive residual stresses. This paper reports the details of exploratory tests involving tensile and compressive loading of a test coupon, followed by a low temperature post plastic straining thermal treatment, and subsequent re-loading in tension and compression. Finally results of a full scale Safe Maximum Pressure (SMP) test of pressure vessels are presented; these tests indicate a significant increase (11%) in SMP.
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10

Kerkhof, Klaus, Eberhard Roos, Georges Bezdikian, Dominique Moinereau, and Nigel Taylor. "SMILE: Validation of the Warm-Pre-Stress Effect With a Cylindrical Thick-Walled Specimen." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71364.

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The Reactor Pressure Vessel (RPV) is an essential component, which is liable to limit the lifetime duration of PWR plants. The assessment of defects in RPV subjected to pressurized thermal shock (PTS) transients made at an European level generally does not necessarily consider the beneficial effect of the load history (Warm Pre-stress, WPS). The SMILE project — Structural Margin Improvements in aged embrittled RPV with Load history Effects — aims to give sufficient elements to demonstrate, to model and to validate the beneficial WPS effect. It also aims to harmonize the different approaches in the national codes and standards regarding the inclusion of the WPS effect in a RPV structural integrity assessment. The project includes significant experimental work on WPS type experiments with C(T) specimens and a PTS type transient experiment on a large component. This paper deals with the results of the PTS type transient experiment on a component-like specimen subjected to WPS- loading, the so called Validation Test, carried out within the framework of work package WP4. The test specimen consists of a cylindrical thick walled specimen with a thickness of 40mm and an outer diameter of 160mm, provided with an internal fully circumferential crack with a depth of about 15mm. The specified load path type is Load-Cool-Unload-Fracture (LCUF). No crack initiation occurred during cooling (thermal shock loading) although the loading path crossed the fracture toughness curve in the transition region. The benefit of the WPS-effect by final reloading up to fracture in the lower shelf region, was shown clearly. The corresponding fracture load during reloading in the lower shelf region was significantly higher than the crack initiation values of the original material in the lower shelf region. The post test fractographic evaluation showed that the fracture mode was predominantly cleavage fracture also with some secondary cracks emanating from major crack.
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Reports on the topic "Thick-walled vessel"

1

Troiano, Edward, G. N. Vigilante, and John H. Underwood. Experiences and Modeling of Hydrogen Cracking in a Thick-Walled Pressure Vessel. Fort Belvoir, VA: Defense Technical Information Center, August 2001. http://dx.doi.org/10.21236/ada395366.

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