The relationship between fracture toughness and shear lip size

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dc.contributor.advisor Associate-Professor W. G. Ferguson en
dc.contributor.author Lai, M. O. (Man On), 1947- en
dc.date.accessioned 2008-06-03T04:12:45Z en
dc.date.available 2008-06-03T04:12:45Z en
dc.date.issued 1977 en
dc.identifier.citation Thesis (PhD--Mechanical Engineering)--University of Auckland, 1977. en
dc.identifier.uri http://hdl.handle.net/2292/2546 en
dc.description.abstract The plane strain fracture toughness of a high strength low alloy steel, En 25, tempered from the as-quenched state to 650°C, and a high strength aluminium alloy, 7075-T6, have been determined using compact tension specimens of varying thicknesses from 4 to 25mm. The size of the shear lips, BSL, measured at the free surfaces of the specimens was found to be independent of the specimen thickness and to be related to the true plane strain fracture toughness, KIC, through the expression BSL = 0.41(KIC/σ ys)2.02, where σys is the 0.2% proof stress of the material. A rationale for this behaviour is that BSL is approximately equal to the size of the plane stress plastic zone, ry, at the surfaces of a plate specimen, which from theoretical analysis, has been shown to be rY = Π/8(KIC/σYS)2. The ASTM standard plane strain fracture toughness test method has been proven to be insensitive to detect excess yielding in the specimens tempered at temperatures higher than 450°C. At high tempers, yielding fracture mechanics approaches were used to determine the true KIC values. The fracture toughness versus shear lip size relationship is believed to have considerable importance in the analysis of service failures and in the preliminary study of specimen size effect in plane strain fracture toughness determination. en
dc.format Scanned from print thesis en
dc.language.iso en en
dc.publisher ResearchSpace@Auckland en
dc.relation.ispartof PhD Thesis - University of Auckland en
dc.relation.isreferencedby UoA750681 en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.title The relationship between fracture toughness and shear lip size en
dc.type Thesis en
thesis.degree.discipline Mechanical Engineering en
thesis.degree.grantor The University of Auckland en
thesis.degree.level Doctoral en
thesis.degree.name PhD en
dc.subject.marsden Fields of Research::290000 Engineering and Technology en
dc.rights.holder Copyright: The author en
pubs.local.anzsrc 0913 - Mechanical Engineering en
pubs.org-id Faculty of Engineering en


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