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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

Desenvolvimento de um sistema para an?lise de integridade estrutural de equipamentos est?ticos baseado em cad vps micro cracks e ultrassom

Ramos, Moacir Bispo 04 December 2009 (has links)
Made available in DSpace on 2014-12-17T14:57:58Z (GMT). No. of bitstreams: 1 MoacirBR_DISSERT.pdf: 4521415 bytes, checksum: c98edffad04a3e49fed259b6f659f5f2 (MD5) Previous issue date: 2009-12-04 / Universidade Federal do Rio Grande do Norte / In general, the designs of equipment takes into account the effects and processes of deterioration it will undergo and arrives at an approximate useful life. However, changes in operational processes and parameters, the action of external agents, the kind of maintenance conducted, the means of monitoring, and natural and accidental occurrences completely modify the desired performance of the equipment. The discontinuities that occur in anisotropic materials often and due to different factors evolve from being subcritical to critical acquiring the status of defect and compromising the physical integrity of the equipment. Increasingly sophisticated technological means of detection, monitoring and assessment of these discontinuities are required to respond ever more rapidly to the requirements of industry. This paper therefore presents a VPS (Virtual Pipe System) computational tool which uses the results of ultrasonic tests on equipment, plotting the discontinuities found in models created in the CAD and CAE systems, and then simulates the behavior of these defects in the structure to give an instantaneous view of the final behavior. This paper also presents an alternative method of conventional ultrasonic testing which correlates the integrity of an overlay (carbon steel and stainless steel attached by welding) and the reflection of ultrasonic waves coming from the interface between the two metals, thus making it possible to identify cracks in the casing and a shift of the overlay / Os projetos de equipamentos em geral j? contemplam os esfor?os e os mecanismos de de processo e de par?metros operacionais, a??o de agentes externos, esp?cie de manuten??o aplicada, forma de acompanhamento, ocorr?ncias naturais e acidentes modificam completamente deteriora??o a que estes est?o submetidos, prevendo aproximadamente sua vida ?til, por?m, mudan?as o comportamento esperado dos equipamentos. As descontinuidades em materiais anisotr?picos muitas vezes e, por diversos fatores, evoluem da condi??o de subcr?ticas para cr?ticas assumindo o status de defeito e comprometendo a integridade f?sica do equipamento. Meios de detec??o, monitora??o e avalia??o dessas descontinuidades, cada vez mais tecnol?gicos, s?o requeridos para responderem de forma mais eficaz ? exig?ncia da ind?stria. Assim, este trabalho apresenta uma ferramenta computacional VPS (Virtual Pipe System) que utiliza o resultado de ensaios de ultrassom em equipamentos plotando essas descontinuidades encontradas em modelos criados em sistemas CAD e CAE e, ainda, simula o comportamento desses defeitos na estrutura possibilitando a visualiza??o instant?nea do comportamento final. Apresenta-se ainda neste trabalho um m?todo alternativo de ensaio ultrass?nico convencional que correlaciona a integridade de um overlay (a?o carbono e a?o inoxid?vel depositado por solda) com as reflex?es de ondas de ultra-som provindas da interface entre os dois metais, possibilitando a identifica??o de trincas no revestimento e de descolamento do overlay

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