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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

An investigation of the stresses in a discontinuity region of a pressure vessel

Greenstreet, William LaVon. January 1958 (has links)
Thesis (M.S.)--University of Tennessee.
22

Hydrostatic pressure retainment

Setlock, Robert J. January 2004 (has links)
Thesis (M.S.)--Ohio University, June, 2004. / Title from PDF t.p. Includes bibliographical references (p. 105-107)
23

Analise estrutural de um modelo de vaso de pressao de concreto protendido em regime nao linear

MATTAR NETO, MIGUEL 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:29:03Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:02:16Z (GMT). No. of bitstreams: 1 01004.pdf: 6183750 bytes, checksum: 754e7eb886e390080462021a6a3f0bb3 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
24

Introducao a analise de vasos de pressao em concreto protendido multicavidade

SILVA, MARIA C.A.T. da 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:32:18Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:10:34Z (GMT). No. of bitstreams: 1 02345.pdf: 6179530 bytes, checksum: 95b89e07915958ef65f5afb31c7036f2 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
25

Um modelo para a analise estrutural de flanges de vasos de pressao nucleares

OLIVEIRA, CARLOS A. de 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:32:19Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:10:29Z (GMT). No. of bitstreams: 1 01539.pdf: 2619471 bytes, checksum: 65a3f84aa03ddb8d57b288f87aa1a2f1 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
26

Analise estrutural de um modelo de vaso de pressao de concreto protendido em regime nao linear

MATTAR NETO, MIGUEL 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:29:03Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:02:16Z (GMT). No. of bitstreams: 1 01004.pdf: 6183750 bytes, checksum: 754e7eb886e390080462021a6a3f0bb3 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
27

Introducao a analise de vasos de pressao em concreto protendido multicavidade

SILVA, MARIA C.A.T. da 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:32:18Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:10:34Z (GMT). No. of bitstreams: 1 02345.pdf: 6179530 bytes, checksum: 95b89e07915958ef65f5afb31c7036f2 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
28

Um modelo para a analise estrutural de flanges de vasos de pressao nucleares

OLIVEIRA, CARLOS A. de 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:32:19Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T14:10:29Z (GMT). No. of bitstreams: 1 01539.pdf: 2619471 bytes, checksum: 65a3f84aa03ddb8d57b288f87aa1a2f1 (MD5) / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
29

Regulamentos tecnicos de apoio para atendimento a NR 13 / Support technical standards to attend NR 13

Vecchi, Rodrigo de 08 November 2009 (has links)
Orientador: Caio Glauco Sanchez / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-08-14T18:39:43Z (GMT). No. of bitstreams: 1 Vecchi_Rodrigode_M.pdf: 8478782 bytes, checksum: 86a22fd7ce3d6d0db538dbff0f6c1341 (MD5) Previous issue date: 2009 / Resumo: Procurou-se neste trabalho, reunir uma grande quantidade de normas técnicas de inspeção, de projeto e de ensaios não destrutivos a fim de serem sugeridos e principalmente fornecer dados e critérios necessários para a realização segura e apropriada dos exames e testes tidos como mandatórios ou alternativos na NR13. Para isto foi necessária uma pesquisa detalhada do acervo de normas técnicas existentes em nosso país e também em outros países, a fim de obter informações que pudessem ser confrontadas com casos específicos e reais, cujos dados foram coletados com profissionais qualificados e certificados. Três aspectos foram analisados: os requisitos da norma NR13, que é compulsória e tem abrangência geral, critérios específicos utilizados por normas de enfoque singular, ou seja, para uma única linha de equipamento, de teste ou de inspeção e a experiência prática que trouxe a realidade encontrada em muitos estabelecimentos através do resultado de inspeções realizadas para garantir a segurança na operação de vasos de pressão e caldeiras. Vale frisar que tais inspeções fazem parte de nosso acervo técnico pessoal e estão devidamente registradas no CREA através de mais de 600 ART's recolhidas em 8 diferentes estados brasileiros. Também foram apresentados alguns acidentes gerados, talvez, pela execução errônea de testes e inspeções, seguidos por sugestões que poderiam evitar a ocorrência dos mesmos. Os resultados desse trabalho são de grande importância nos futuros estudos e revisões normativas. / Abstract: It was intended to group a large amount of technical standards that treat about Boilers and Pressure Vessel design and inspections and also non destructive examinations in order to suggest and supply data and criteria to perform appropriate and safe inspections and examinations mentioned as mandatory or alternative at NR13. It was necessary an extensive research into Brazilian and foreign standards to collect information which could be confronted with real and specific cases described by qualified and certificated professionals. Three aspects have been analyzed: NR13 requirements which are mandatory and have only a global sight, criteria used in specific situations for unique kind of equipment, test or examination and practical experience that brought the reality of many companies through the result of inspections performed to guarantee a safe operation of pressure vessels and boilers. It is important to emphasize that these inspections belong to a personal technical performance and are registered at CREA through more than 600 ART's paid in 8 different Brazilian states. It was also presented some accidents probably caused by wrong execution of tests and inspections, followed by suggestions which could avoid them. The results obtained from this job are very important in future studies and revisions of normative standards. / Mestrado / Termica e Fluidos / Mestre em Engenharia Mecânica
30

Three dimensional stress intensity factor for large arrays of radial internal surface cracks in a cylindrical pressure vessel

Pierola, Javier 22 November 1993 (has links)
The objective of this study is to present the mode I stress intensity factor distribution (SIF) along the crack-front for a wide array of semicircular and semi-elliptical surface cracks inside of a pressurized thick-walled cylinder. A three-dimensional finite element package ANSYS is used to evaluate the SIF for multicracked cylinder with number of cracks from n=1 to 128, the ratio of crack-depth to the wall thickness a/t=0.05 to 0.6, the ellipticity of the crack (the crack-depth to the semi-crack length) a/c=0.2 to 1.5, the ratio of the outer to the inner radius ro/ ri=2. A substructuring technique is introduced which solved a coarse model meshed with ten-node isoparametric elements and applied the resulting displacements in the boundary surface of a submodel which is built employing singular elements along the crack-front to produce the 1/√r singularity . The SIF is evaluated using nodal-displacement method. To validate the modeling and analysis procedure of the present results various configurations were solved using this method and compared to other finite element solutions. The present results were in very good agreement: less than 5 % comparing with Raju and Newman's results and within 8 % of Kirkhope's results. An empirical equation to calculate the maximum SIF, was developed in this study. The equation was obtained by nonlinear fitting of the finite element results and the error was within ± 5.7 %.

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