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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 98 for “"external pressure"”.
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Elastic Stability of Conical Shells Loaded by Uniform External Pressure
Made available in DSpace on 2014-12-04T23:10:51Z (GMT). No. of bitstreams: 1 0006988.pdf: 2004587 bytes, checksum: 06f8705c379bd3f4b0f8525521900796 (MD5) Previous issue date: 1953
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Creep buckling of shells of revolution loaded under uniform external pressure
A theoretical investigation is undertaken into the creep instability of two common shells of revolution, the infinitely long cylinder and the complete sphere. The linear and non-linear visco-elastic material idealizations are used in the various theoretical procedures. The critical buckling time is …
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Nonlinear deformations of a thick-walled hyperelastic tube under external pressure
… cylindrical hyperelastic tubes under external pressure. Initially, we consider bifurcation from a circular cylindrical deformed configuration of a thick-walled circular cylindrical tube of incompressible isotropic elastic material subject to combined axial loading and external …
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Buckling and postbuckling behavior of prolate spheroidal shells under uniform external pressure
… enclosed prolate spheroidal shells under uniform external pressure. It is assumed that the shells are isotropic and elastic, and have a uniformly thin wall. It is further assumed that the prebuckling state can be described by membrane theory. In this analysis the buckling displacements are …
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Buckling of composite conical shells under combined axial compression, external pressure, and bending
… shells subjected to combined axial loading, external pressure, and bending is investigated using energy and finite element methods. The conical shells have single and multiple layers, different cone angle, length, and radius. These parameters are considered to determine optimal condition …
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Computer aided reliability based design of ring-stiffened cylindrical shells under external pressure
… of ring-stiffened cylindrical shells under external pressure. Depth independent partial safety factors to be applied to the resistance (collapse pressures), are proposed for the four relevant collapse modes (Interframe Shell Collapse, Frame Yield, Plate Yield and Frame Tripping), covering …
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Photoplethysmography for non-invasive measurement of bone hemodynamic responses to changes in external pressure
… bone hemodynamic responses to changes in external pressure, and 3) identify the predominant mechanisms regulating bone hemodynamic responses to pressure changes. A new PPG device capable of measuring bone hemodynamic responses was designed and tested. It represents the state-of-the-art in …
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Investigation of the Stability of Metallic/Composited-Cased Solid Propellant Rocket Motors under External Pressure
… vulnerable and prone to buckling due to sudden external pressures produced by nearby detonation. The stability conditions of rocket motors subjected toaxisymmetric, external pressure loading are examined. The outer cases of motors are considered as isotropic (metallic) or anisotropic …
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The effectiveness of United Nations multifunctional peace-support - comparing conflict transformation in Angola and Mozambique
… due to a combination of two main causes: strong external pressure and military stalemate. External pressure, however, decreased after the peace agreement was concluded, and, equally important, the implementation of the accord created a new military situation. The United Nations, restricted by a …
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Estudo do comportamento de lastros de materiais granulares sobre estacas com capitéis através de modelos reduzidos
… size distribuition of the granular material, external pressure, and two - and three - dimensional effects. The behaviour observed in the model were compared with that predicted by available theoretical methods. The following points were observed: i) the density of the base is an important …
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A numerical model of cardiovascular fluid mechanics during external cardiac assist
External cardiac assist (ECA) is a noninvasive, counterpulsative method that aims to provide temporary aid to the failing heart through increased diastolic augmentation and decreased systolic after load. These counterpulsative benefits are achieved by sequentially inflating cuffs on the calves, …
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Essays on environmental regulations and performance of firms
… of these newer approaches by studying how external pressures and internal awareness affect a firm's polluting behavior. Two essays focus solely on the role of the print media, an external pressure to firms, under the U.S. Toxic Release Inventory program. It first studies the association of …
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Sintering of Micro-scale and Nanscale Silver Paste for Power Semiconductor Devices Attachment
… Two low-temperature sintering techniques - pressure-assisted sintering micro-scale silver paste and sintering nanoscale silver paste without external pressure - were developed. With the large external pressure, the sintering temperature of micro-scale silver paste can be significantly …
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Comparative analysis of judicial independence in Zambia and South Africa : security of tenure, appointment and removal procedures
… depending on the influence of another or any external pressure. The judiciary only owes its loyalty to the constitution and the law in the way it dispenses with justice. One of the requirements of the principle of judicial independence is appointing judicial officers in an open and transparent …
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Análise estrutural de painéis curvados reforçados sob carregamento de pressão externa uniforme
… of reinforced curved panels under uniform external pressure loading is investigated in this study through experimental tests and numerical simulations based on the finite element method. The experimental tests carried out in this investigation cover tensile testings, imperfection …
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Submillimetre Studies of Pre-stellar and Starless Cores in the Ophiuchus, Taurus and Cepheus Molecular Clouds
… N2H+ freezeout. Virial analysis, including external pressure, shows that most cores are either bound or virialised. Gravitational potential and external pressure energies are found to be typically of a similar order of magnitude, with some variation between regions. Non-thermal linewidths …
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Buckling of an equatorial segment of a spherical shell loaded by its own weight
… stress for a complete sphere loaded by uniform external pressure.
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Mechanical Behavior of Metals Under Triaxial Stress: Apparatus and Experiments
Under combined axial-stress/external-pressure loadings, a solid specimen experiences a truly three-dimensional, homogenous stress state comprised of a uniform axial stress in conjunction with radial and circumferential stresses equal to the negative of the pressure, -P. Through independent computer …
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Early childhood HASS matters: An investigation of early childhood staff and their transition to the new Western Australian Humanities and Social Sciences Curriculum in 2017
… Sciences (HASS) Curriculum in 2017, may place external pressure on teachers as they transition from existing to new curricula. The aim of this interpretivist study was to investigate the transition to the new WA HASS Curriculum in 2017. The experiences and perspectives of the school leaders and …
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Análise probabilística da falha por colapso de risers e dutos submarinos corroídos
… collapse of corroded submarines pipelines under external pressure. Concepts of structural reliability are applied with limit state functions to evaluate failure probability and the detrimental effect of corrosion damages on the pipelines. This reliability model consider material properties, …
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