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  <doc>
    <id>1487</id>
    <completedYear/>
    <publishedYear>2010</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
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    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Numerical and experimental investigation of the influence of HAZ on the fracture behavior of longitudinal welded linepipes</title>
    <abstract language="eng">The present paper deals with the influence of heat affected zone (henceforth HAZ) on the fracture performance of longitudinal welded linepipes in dependence on constraint level. It has been shown that   toughness values of HAZ obtained from standard fracture mechanics  tests lead to uneconomic linepipe design for two reasons. The first  reason is that laboratory specimens with higher constraint level  generally exhibit lower fracture resistance compared to flawed  linepipes. The second one has to do with a higher probability of cleavage failure occurrence in the laboratory specimen than in the linepipes due to larger areas of lower toughness (so called local brittle zones (LBZ)) intersected by crack front. In recent years  numerous studies have been initiated with the objective to quantify  the constraint level and thus to allow for less conservative linepipe  safety assessment by applying constraint corrected toughness values. However, the main focus of these studies has hitherto been on the  homogeneous  materials, failing to account for the possible effects of different microstructures within the heterogeneous HAZ. This paper  seeks to close this gap by reporting on results from tests on  fracture mechanics specimens of a high strength X80 steel, i.e. SENB  and SENT specimens as well as results from ring expansion tests.  Both, deep and shallow cracks are inserted in the fracture mechanics specimens and rings targeting the fusion line (FL). By varying the initial crack size and sample type, different constraint levels are   achieved and subsequently quantified using numerical methods. Besides  constraint observations, post metallographic analyses are performed  to identify exact HAZ microstructure involved at the crack tip.  Finally, the influence of HAZ properties, flaw size and geometry on  the failure behaviour of the linepipes has been demonstrated and assessed. Based on the combination of the results from constraint   studies and the post metallographic analyses, the methodology is proposed which enables simple quantitative prediction of toughness  values for safe and economic design of linepipes with flaws located in HAZ.</abstract>
    <parentTitle language="eng">18th European Conference on Fracture, Fracture of Materials and Structures from Micro to Macro Scale, Dresden, Germany</parentTitle>
    <identifier type="url">https://www.gruppofrattura.it/ocs/index.php/esis/ECF18/paper/viewFile/6273/2143</identifier>
    <author>Aida Nonn</author>
    <author>Marion Erdelen-Peppler</author>
    <author>Christoph Kalwa</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>X80</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>HAZ</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>constraint analysis</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>linepipe safety</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>LSAW linepipe</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>local brittle zones</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>finite element modeling</value>
    </subject>
    <collection role="ddc" number="620">Ingenieurwissenschaften und zugeordnete Tätigkeiten</collection>
    <collection role="institutes" number="FAKMB">Fakultät Maschinenbau</collection>
    <collection role="othpublikationsherkunft" number="">Externe Publikationen</collection>
    <collection role="institutes" number="TCNeustadt">Technologie-Campus Neustadt an der Donau</collection>
    <collection role="persons" number="nonncmm">Nonn, Aida (Prof. Dr.) - Computational Mechanics and Materials Lab</collection>
    <collection role="persons" number="tcnehno">Technologie-Campus Neustadt a. d. Donau (Prof. Ehrlich+ Prof. Nonn)</collection>
    <collection role="othforschungsschwerpunkt" number="16316">Produktion und Systeme</collection>
    <collection role="institutes" number="">Computational Mechanics and Materials Lab (CMM)</collection>
  </doc>
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