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Showing 1 to 20 of 291 for “"release rate"”.
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Controlling Object Heat Release Rate using Geometrical Features
… the effect of complex geometries on the burning rate of materials made using additive manufacturing. Controlling heat release rate has applicability in limiting fire hazards as well as for designing fuels for optimal burning rate. The burning rate of a structure is a function of the material …
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Computational Study of Parameters Affecting Electric Cabinet Fire Heat Release Rate
… cabinet fires, which are quantified as the heat release rate (HRR), and properly categorize them. With this knowledge, optimal parameter-response relationships can be developed to predict the electrical cabinet fire behavior. Statistical analysis conducted in this study on historical fire …
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The constrained blister - a nearly constant strain energy release rate test for adhesives
… test permitting nearly constant strain energy release rate testing of adhesive bonds. The work consisted of three parts; (1) development of the testing technique to evaluate strain energy release rate and to record the time dependent nature of the fracture process, (2) numerical analysis of the …
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Available fluoride ion in solution and one minute fluoride release rate of a toothpaste formulation
… limited quantity. In this research, calcium nitrate salt and potassium phosphate dibasic salt solutions were encapsulated in microcapsules and formulated with toothpaste. The microcapsules rupture upon brushing, releasing bioavailable calcium, phosphate, and fluoride ions for remineralization. …
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A Mixed Eulerian-Lagrangian Model for the Analysis of Dynamic Fracture (Finite Element Method, Moving Mesh, Virtual Energy Release Rate)
This study is concerned with the development of continuum formulations for the analysis of static and dynamic brittle fracture problems based on a mixed Eulerian-Lagrangian kinematic model. Effective finite element computational methods based on the continuum formulations are also described.
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Equivalence Ratio Gradient Effects on Local Flame Front Topology and Heat Release Rate in Stratified, Iso-Octane/Air Turbulent V-Flames
… a novel rectangular slot burner that could generate controlled, transverse variations in mixture strength along its exit plane. Turbulent, iso-octane/air V-flames were anchored in reactant mixtures of varying mean gradients in equivalence ratio (ϕ) and a unique windowing approach was devised in …
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Vortex driven flame dynamics and combustion instability
… mostly arises due to the coupling between heat release rate dynamics and system acoustics. It is crucial to understand the instability mechanisms to design reliable, high efficiency, low emission gas turbine combustors. In this thesis, elementary processes acting as a source of unsteady heat …
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The development of the peninsula blister fracture test for adhesively bonded joints
… benefits from both a constant strain energy release rate over the major portion of the debond length and a high strain energy release rate at any given pressure. Applications of this technique to several adhesion systems were conducted. Although some of these systems haven't been successfully …
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A Five-Zone Model for Direct Injection Diesel Combustion
… for ignition delay, premixed burn duration, heat release rate, and heat transfer were also included. <p>Apparent heat release rate results of the model were compared with data from a constant volume combustion vessel and two single-cylinder direct injection diesel engines. The modeled heat release …
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Experimental and Numerical Investigations on the Durability and Fracture Mechanics of the Bonded Systems for Microelectronics Application
… measured as a function of applied strain energy release rate, G, and temperature using a wedge test geometry. The specimens consist of two glass plates bonded with a thin layer of proprietary epoxy adhesive. The crack fronts along the epoxy/glass interfaces were measured using an optical …
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Nano-filled Epoxy: Mechanical and Fire Behavior and Modeling of Nanocomposite Columns Under Fire
… stress intensity factor, and the critical energy release rate. With static mechanical tests the tensile and flexural properties of the nanocomposites are measured. Flammability tests made by cone calorimetry are used to determine the Heat Release Rate, Mass Loss Rate, time to ignition, to Peak of …
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Spatially Resolved Analysis of Flame Dynamics for the Prediction of Thermoacoustic Combustion Instabilities
… to look for more environmentally combustion strategies. For gas turbine combustion, one promising technology is lean premixed combustion, which results in lower flame temperatures and therefore the possibility of significantly reduced nitric oxide emissions. While lean premixed combustion …
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Sediment Phosphorus Cycling in a Managed System Irondequoit Bay, N.Y.
… water column profiles were used to quantify the release rate of phosphorus from the deepwater sediments of Irondequoit Bay during summer periods of low hypolimnetic oxygen. The top 25 cm of sediment cores collected monthly from May 2004 through September 2004 were analyzed for total phosphorus, …
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Face Sheet/core Debonding In Sandwich Composites Under Static And Fatigue Loading
… (MMB) specimen was employed to evaluate energy release rate, compliance and global mode ratio for composite under investigation. It was observed that energy release rate, compliance and global mode ratio increases with increase in crack length. For fatigue life is investigated for constant …
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Investigations into the use of continuous low-level medication for the control of helminths in the ruminant
… of gastro-intestinal parasites. The daily drug release rate. required to inhibit egg hatch and eliminate the worm burden is established. A minimum daily release rate of 3.0 mg per kg bodyweight was shown to be required to completely inhibit egg hatch and 4.5 mg per kg for effective vermicidal …
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Development of Co-processed Plasticized Cellulose Acetate for Sustained Release Matrix Tablets
… CA, it is a good polymer candidate for sustained release matrix tablets. Sustained release matrix tablets of cellulose acetate can be prepared by direct compression or wet granulation methods. However, previous studies showed that a large amount of CA was required to achieve the desired sustained …
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Delamination buckling, postbuckling, and growth in axially loaded beam-plates
… load and postbuckling solution. The energy release rate is then determined using the postbuckling solution. Curves are provided to show the effect of delamination length and location on buckling loads, energy release rates, and strengths of the beam-plates. The problem of buckling and …
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Linear Stability Analysis of a Rijke Tube and Modeling of Turbulent Combustion Using Dynamic Well-Stirred Reactors
… is comprised of the summation of chemical heat release rate and heat transfer due to convection, correctly predicts instability where older models of acoustic forcing based solely on chemical heat release rate incorrectly predicted stability. This stability analysis correctly predicts the inlet …
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Machine Learning-Driven Uncertainty Quantification and Parameter Analysis in Fire Risk Assessment for Nuclear Power Plants
… uncertainties, especially in predicting the heat release rate (HRR) — a key parameter for assessing fire severity. This dissertation presents an innovative framework that integrates machine learning (ML) models, particularly neural networks and tree-based algorithms, with uncertainty …
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Investigation of the Effects of Geometry on the Efficiency of the Double Lap Joint of Unidirectional Fiberglass Composites
… and the corresponding critical strain energy release rate are independent of initial crack length in the range of crack length investigated. The critical strain energy release rate in Mode II is roughly six times higher for the elliptical geometry than for the rectangular.</p>
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