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Showing 1 to 20 of 101 for “"Thermal stresses"”.
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Photoelastic analysis of thermal stresses
… of photoelastic techniques to the study of thermal stress problems are here briefly reviewed, then followed by a short introduction to the relevant photoelastic and thermoelastic theories. A new method for the study of transient thermal stresses; as well as stresses due to the internal …
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An Isothermal Analogy for Thermal Stresses in Shells
Made available in DSpace on 2014-12-10T17:25:54Z (GMT). No. of bitstreams: 1 7020975.pdf: 1174687 bytes, checksum: b14e68df298b48eb759c1d323a2a98a3 (MD5) Previous issue date: 1970
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Thermal stresses in a finite solid-propellant grain
… understanding of actual solid propellant thermal stress problems, the geometry of the solid propellant baa been idealized as a short, circular cylinder with flat ends. It is felt that the consideration of actual curved ends would only unduly have complicated the analysis. The method of …
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Environmental thermal stresses as a first passage problem
Due to changes of the thermal environment, thermal stresses are produced in structures. Two approaches based on the stochastic process theory are used to describe this phenomenon. The structure is idealized as a long hollow viscoelastic cylinder. Two sites are considered: Barrow (AK) and Yuma (AZ). …
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Thermal stresses in coatings on carbon-carbon composites
The objective of this study was to investigate thermal stresses in oxidation protection coatings on carbon-carbon composites. Multilayer coatings with each layer of coating applied at a different temperature, and gradient coatings with continuously varying properties through the thickness of the …
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Process modeling for solidification microstructure and transient thermal stresses in laser aided DMD process
… kinetics, solidification parameters, thermal stresses and microstructure is highly desirable. This research deals with four key aspects of laser aided DMD. First, effect of solid state phase transformation on thermal stresses. Second, influence of high cooling rates on solidification …
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The effect of residual thermal stresses on the viscoelastic behavior of adhesively bonded joints
… experimental evidence suggest that residual thermal stresses alter the in-situ adhesive properties compared to the bulk adhesive: Furthermore, preliminary results indicate that the free volume nonlinear viscoelastic theory accounts for the effect of residual strains on the in-situ adhesive …
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A general solution for the thermal stresses and strains in an infinite, hollow, case-bonded rocket grain
… was to develop a general solution for the thermal stresses and strains in a hollow cylindrical case-bonded solid propellant. The heat conduction equation, as solved by Carslaw and Jaeger, was applied to a hollow composite cylinder. The temperature distribution from this equation was used in …
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The influence of visco-elastic processes on the generation of thermal stresses in quenched low alloy steel plates.
… solid, which allowed the calculation of the thermal stress and strain during quenching in water, oil and in a martempering situation. The introduction of viscous flow into the calculation produced a marked improvement in the degree of agreement between the calculated and experimental residual …
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On the Thermal Stresses Due to a Uniform Heat Flow Past a Circular Hole With a Radial Edge Crack
… in this dissertation is that of finding the stresses in an isotropic, linear, thermoelastic solid when a uniform heat flow is disturbed by the presence of an insulated circular hole with a radial edge crack. By superimposing a Mellin transform solution of the equations of thermoelasticity on …
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Effects of thermal stresses on Pressurised Water Reactor nuclear containment vessels following a Loss of Coolant Accident with assimilated containment filtered venting system
… overall capability to withstand thermodynamic stresses like over-pressurisation and high temperatures. The failure of this final barrier will lead to the release of radioactivity to the surrounding environment. To examine the effects of thermo-hydraulic stresses on PWR containment following a …
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Behavior of a cantilever plate subjected to rapid edge heating
… wings subjected to aerodynamic heating induce thermal stresses that may effectively reduce the stiffness of the wing. The effects of this reduction in stiffness were investigated experimentally by rapidly heating the edges of a cantilever plate. The midplane thermal stresses imposed by the …
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Residual stresses due to grinding
An analytic treatment of stresses and temperatures generated during grinding is presented from an elasticity approach. A two-dimensional heat conduction model employs an energy partition scheme in the grinding zone to produce realistic temperature profiles. By using the basic equations of …
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Numerical analyses of the long term behavior of enhanced geothermal system (EGS)
Enhanced Geothermal System (EGS) technology is a challenging extrapolation of conventional hydrothermal geothermal systems but expected to significantly contribute to U.S. energy in near future. This technology is still going through a steep learning phase and current research studies are mostly …
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Steady state thermal stress analyses of two-dimensional and three-dimensional solid oxide fuel cells
… power. The present work characterizes the thermal stresses arising during the operation of planar solid oxide fuel cells which is a critical factor in the development of an efficient fuel cell. The thermal stresses are calculated from the temperature fields using ANSYS(TM). A sequentially …
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Characterization Study of Plasma Spray Attachment of Intrinsic Fabry-Perot Interferometric Sensors in Power Generation Applications
… The material properties of the deposits and the thermal stresses in the system were evaluated to determine attachment lifetime of the sensors. The encapsulated sensors' signals were collected before and after plasma spraying and at elevated temperatures. The material properties of the deposits …
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Solidification cracking resistance of high strength aluminum alloys
… rates at different parts of the ingot cause thermal stresses. Due to these thermal stresses, cracks are initiated at the startup stage which may propagate as the stress elevates. Hence the evaluation of fracture toughness (cracking resistance) at different parts of ingot is very much …
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Thermal fracture service life analysis of a case bonded visco-elastic cylinder
Environmental temperature changes produce cyclic thermal stresses in structures. Because temperature and hence thermal stresses are random and mechanical properties such as strength, relaxation modulus, and fracture toughness are time and temperature dependent as well as statistically variable …
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Redesign and shock analysis of HALIFAX class frigate gas turbine uptake structure
… frigates of the Canadian Navy have experienced thermally-induced fatigue cracking since soon after the commissioning of these ships. The uptake structure is heavily stiffened in order to meet shock resistance requirements. Unfortunately, the result has been that thermal expansion of the uptake …
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Effect of Thermal Loading on the Performance of Horizontally Curved I-Girder Bridges
… in terms of their response to changing thermal conditions. In most cases, it is assumed that bearing design allows expansion and contraction of the superstructure that relieves thermal stresses, but in reality this is rarely true. Bridge curvature complicates the structures response to …
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