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Showing 1 to 20 of 48 for “"pressure vessels"”.
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Digital material skins : for reversible reusable pressure vessels
… skin for airtight,waterproof, high or low pressure applications.The surface is enclosed or the surface is open. Digital material skins are used to construct any shape or interior volume that is regular or amorphous. A digital material skin is an exterior structure which relies on an …
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Acoustic Emission for Periodic Inspection of Composite Pressure Vessels
… for hydrostatic recertification of high-pressure composite gas cylinders with acoustic emission (AE) nondestructive testing. Advantages of AE recertification over the current hydrostatic method include: (1) no water contamination, since pressurization of the cylinders is done with air as …
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A structural health monitoring system for composite pressure vessels
… has been developed to detect damage in high-pressure storage cylinders made of Carbon Fiber Reinforced Polymers (CFRP). This structural health monitoring system could lead to lighter, lower cost cylinders, and improved safety in automotive applications that utilize hydrogen and natural …
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Burst Pressure Prediction of Filament Wound Composite Pressure Vessels Using Acoustic Emission
… growth activity can be used to predict burst pressures in filament wound composite pressure vessels. Acoustic emission data were taken during hydroproof testing for a set of eleven ASTM standard 5.75 inch diameter fiberglass/epoxy bottles. Amplitude distributions were created using only the AE …
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Damage Detection Methodologies For Structural Health Monitoring of Thin-Walled Pressure Vessels
… particularly aged Composite Overwrapped Pressure Vessels (COPVs) for the current and future implementation of COPVs for space missions. In this study, the research was conducted in collaboration with NASA Kennedy Space Center and also NASA Marshall Space and Flight Center engineers. COPVs …
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Predicting Burst Pressures in Filament Wound Composite Pressure Vessels Using Acoustic Emission Data
… a statistical method for predicting the burst pressures in filament wound composite pressure vessels by analyzing acoustic emission data obtained during hydroproof testing. First the acoustic emission data is plotted in the form of amplitude distributions. Then, by using statistical models with …
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A critical analysis of the acoustic emission technique for NDE of pressure vessels
… the acoustic emission testing, especially, in a pressure vessel where a uniform pressure can produce a nonuniform stress distribution due to the presence of the singularities such as the nozzles and supports. The combined loading of vapor and hydrostatic pressure can also generate a nonuniform …
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Neural Network Burst Pressure Prediction in Composite Overwrapped Pressure Vessels from Acoustic Emission Data
… have been obtained by switching from all metal pressure vessels to composite overwrapped pressure vessels (COPVs). Due to the nature of composites, current nondestructive analysis procedures for COPVs are not adequate for assessing structural integrity. As such, new methods must be developed. …
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Electronic Speckle Pattern Interferometry (ESPI) NDE of cracks in pressure vessels with FEA modelling
… around a crack or combination of cracks in a pressure vessel by finite element methods. Electronic Speckle Pattern Interferometry (ESPI) is a coherent optical measurement technique that produces a contour map of the surface displacement of an object when it is stressed. The sensitivity of the …
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Neural Network Burst Pressure Prediction in Composite Overwrapped Pressure Vessels Using Mathematically Modeled Acoustic Emission Data
… purpose of this research was to predict burst pressures in composite overwrapped pressure vessels (COPV) using mathematically modeled acoustic emission (AE) data. The AE data were collected during hydrostatic burst (hydroburst) testing often 15-inch (380 mm) diameter COP Vs. The data gathered …
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Lumped-Parameter Analysis for Shear Failure in the End Slab of Cylindrical Prestressed Concrete Pressure Vessels
Made available in DSpace on 2014-12-10T22:21:29Z (GMT). No. of bitstreams: 1 7114794.pdf: 2578047 bytes, checksum: e48156b07c4e6c62e9fdb61a7fafdcbd (MD5) Previous issue date: 1970
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Single crystal silicon as a macro-world structural material : application to compact, lightweight high pressure vessels
… applications, identification of cellular pressure vessels as a promising wafer-scale silicon device, identification of design criteria for brittle pressure vessels and quantified metrics for a competitive silicon pressure vessel design, identification of DRIE failure mechanisms, …
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Detection and assessment of high temperature hydrogen attack in steel pressure vessels using non-collinear wave mixing
… assessing the level of damage in HTHA affected vessels. This study presents a nondestructive testing approach that is capable of evaluating HTHA damage in pressure vessels made of carbon steels. A strategy of detection involving non-collinear wave mixing of ultrasonic waves and pulse-inversion …
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Novel, low-cost, CFRP pressure vessel design for hydrogen fuel cell applications
… of the Carbon Fibre Reinforced Plastic (CFRP) pressure vessel portion of the rocket. The pressure vessel was composed on a long, thin-walled commercial CFRP cylindrical tube that had two Poly Vinyl Chloride (PVC) end caps bonded onto either end with an adhesive. The inside wall of the CFRP tube …
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Development of an approach to incorporate proportional hazard modelling into a risk-based inspection methodology for an optimal inspection policy
The health and safety of pressure vessels are a concern in the power, chemical, petrochemical, and other industries handling gases or liquids at high temperatures. The content of a pressure vessel usually is at a substantially different pressure than the ambient pressure, and if not handled …
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An axisymmetric linear/high-order finite element for filament wound composite structures
… code' to analyze filament wound spherical pressure vessels. In order to develop a design-oriented analysis capability which can produce accurate results rather quickly with reduced input-data requirements, the total number of system equations must be reduced. To accomplish this task, a …
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A Stress Analysis of Circular Cylindrical Shell Intersections, Including the Influences of Reinforcement, Cyclic Plasticity and Fatigue
… to cylinder connections in nuclear reactors or pressure vessels, pipe intersections in offshore platforms etc. The region of intersection presents a sharp geometric discontinuity in the structure which produces a stress field with very high stress concentration.
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A computational and experimental study of the underwater implosion of single and multiple metallic spherical shells
Analysis of the implosion of pressure vessels in a deep-water environment is an important research area for the ocean engineering community. The majority of previous implosion research focused on the implosion of metallic cylinders, while the implosion behavior of volumes of different geometries …
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The Effects of Strain Induced Softening on the Load Carrying Capability of Components
… quenched and tempered 2.25 Cr 1 Mo steel in pressure vessels and piping systems. This material has a bainitic microstructure with improved short term strength characteristics over the more commonly used annealed form. The bainitic material cyclically softens, however, losing as much as 30 …
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A method for the probabilistic method assessment of structures containing defects
… justification of pressurised water reactor pressure vessels is deterministic. To enable probabilistic structural integrity safety cases of reactor pressure vessels to be carried out, a need for a new analysis of the statistical properties of fracture toughness is identified. Fracture is …
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