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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.
1

Einfluss von Autofrettage auf die Schwingfestigkeit innendruck-belasteter Bauteile aus Kugelgraphitguss

Leutwein, Hans-Ulrich January 2008 (has links)
Zugl.: Ilmenau, Techn. Univ., Diss. 2008
2

Entwicklung eines schwingbruchmechanischen Auslegungskonzeptes für innendruckbeanspruchte Bauteile mit ausgeprägten Druckeigenspannungsfeldern

Lechmann, Marcus, January 2007 (has links)
Stuttgart, Univ., Diss., 2007.
3

Análise de falhas em tubos sem costura de aço St52 utilizados em motores diesel / Failure analysis in seamless pipes of St52 steel used in Diesel Engines

Belloto, Humberto Jesuino 19 August 2018 (has links)
Orientador: Paulo Roberto Mei / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica / Made available in DSpace on 2018-08-19T00:26:25Z (GMT). No. of bitstreams: 1 Belloto_HumbertoJesuino_M.pdf: 5308190 bytes, checksum: 1a5267190a7db08ed3b659370b64f95a (MD5) Previous issue date: 2011 / Resumo: O tubo de aço carbono com alto teor de manganês St52 (Norma DIN 1.0580) sem costura, com 8 mm de diâmetro externo e 3 mm de diâmetro interno, atualmente utilizado no sistema de combustível de motores eletrônicos a diesel com pressões de trabalho de até 1300 bar, apresentou problemas nos testes de durabilidade. O rompimento do tubo foi consequência das trincas internas originadas no processo de laminação, denominadas descontinuidades. O tubo de fabricação nacional, atualmente utilizado nos motores, foi comparado com um importado e os resultados dos testes encontrados determinaram qual deles teria maior vida à fadiga. São apresentados nesta dissertação o processo de fabricação do tubo com as suas vulnerabilidades, os testes de fadiga comparando as durabilidades dos tubos nacionais e importados, o efeito do processo de autofretagem e os ensaios metalográficos. Os resultados levaram a concluir que o tubo nacional não atende as solicitações de trabalho do motor e a solução imediata é a utilização do tubo importado. A recomendação para trabalhos futuros seria o estudo de melhoria no processo de laminação para diminuição do nível de descontinuidades internas tubos nacionais / Abstract: The carbon steel with high manganese in accordance with Din 1.0580 (St52) seamless 8 x 3 mm diameter has been used into fuel injection system of the electronic diesel king with pressure up to 1300 bar. This tube presented short life on durability tests due to inner cracks created during rolling process. The tube produced in Brazil and used nowadays in was compared with an imported one using a fatigue test. It is shown on this work the manufacturing tube process, the fatigue test applied to the national and imported tubes and the e effects. The results showed that the national tube does not meet the necessary requirements and the immediate solution is to use the imported one. It is recommended further used on the rolling process to reduce the internal roughness of the tubes produced in Brazil / Mestrado / Materiais e Processos de Fabricação / Mestre em Engenharia Mecânica
4

Výpočtová analýza zbytkových napětí u autofretovaných vysokotlakých zásobníků paliva / Computational analysis of residual stresses in autofrettaged high pressure rails

Blaha, Jakub January 2015 (has links)
The master‘s thesis is aimed on numerical simulation of autofrettage of high pressure fuel vessel – rail in Common Rail system. First there is described Chaboche model, which is later used for simulation of autofrettage. There are described different approaches which can be used to obtain sufficient material model. Then there is observed influence of these different approaches on stress state of rail within the process of autofrettage. Suitability of Chaboche model for autofrettage and re-autofrettage simulations is assessed by comparing with more complex Jiang model. In the end there is a study of influence of autofrettage pressure on different properties, especially on residual stresses.

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