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    Analytical and Experimental Study on the Effect of Discontinuities on Cast Steel Component Performance

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    Author
    Moya, Joseph
    Issue Date
    2020
    Keywords
    Cast Steel
    Finite elements
    Fracture Prediction
    Material discontinuity
    Advisor
    Fleishcman, Robert
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction, presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    An experimental and analytical study is performed to investigate the effect of different discontinuities on the yield strength, ultimate strength and ductility of steel cast components. Steel plates containing various discontinuities were cast in sand molds, cut to size, and tested in monotonic tension to fracture. Radiographic imaging was used to identify, classify, and rate discontinuities. Three different types of discontinuity and three different ASTM 2868 indication levels were tested. The discontinuities varied in size from 0.46 percent to 9.09 percent of the average gross-section area of the specimens. Specimens rated Level 2 or lower tended to fracture at the minimum section, not at the discontinuity. Specimens with Level 5 indications tended to fracture at the discontinuity. Specimens that fractured at the discontinuity had reduced ductile capacity. Elongation was reduced by Level 5 indications by between 45.7 to 70.0 percent. Ductile fracture predictive models were used in finite-element analysis to predict component performance. Models used color data from radiography for discontinuity size. Good agreement is obtained between experimental and predicted elongation at fracture. The analytical modeling methods used in this thesis allow for accessible prediction of ductile capacity of a cast component.
    Type
    text
    Electronic Thesis
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Civil Engineering & Engineering Mechanics
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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