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Large Openings Of The Pressure Vessel To Take Over The Finite Element Analysis And Strength Design

Posted on:2007-06-20Degree:MasterType:Thesis
Country:ChinaCandidate:L WangFull Text:PDF
GTID:2192360185991171Subject:Mechanical Manufacturing and Automation
Abstract/Summary:PDF Full Text Request
Due to the requirements of techniques and structure, Pressure Vessels often need to include larger openings of various types which goes beyond the application of Design by Rules. What can be done is to try to design by making comparative analysis through experiments and experience, which results in unassured security and reliability. Thus the design based on analysis of stress become increasingly important and the Finite Element Analysis has been considered the effective means to the structural analysis.This paper uses Finite Element Analysis and program of ANSYS to establish three-dimension finite element models for the three reinforced structures of Pressure Vessel of thin wall with large opening, by complying with the principle of Design by Analysis, i.e. the analysis of elastic stress and the rules of plastic failure. After an elastic stress analysis on it, the features of stress distribution of these structures are worked out, on one of which a series of models are then established. By examining the function of some variables, the general conclusions are thus made as follows:The bigger the opening rate of large cylindrical opening is, the higher stress that the area of opening produces. It is much securer to use Finite element analysis than reinforced principles available to make a comprehensive stress analysis on reinforced structure area and then evaluate the security by means of Design by Analysis, so that a better reinforced structure can be designed. According to the structure researches of the reinforced structures above, one of the reinforced structure is proposed. The results of ASME and experiment prove that the method above is valid. If a proper evaluation line is selected on Finite Element calculation to linearize stress correctly, the peak stress can be distinguished. The study demonstrates that Finite Element method and ASME method is more secure and reliable to the reinforcement for the large-opening of the pressure vessel.
Keywords/Search Tags:pressure vessel, opening-nozzle reinforcement, design by analysis, three-dimensional finite element, stress linearization
PDF Full Text Request
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