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Study of fracture resistance of a weldment with a propagating crack
Chebolu Lakshmana Rao
Published in Elsevier Ltd
2018
Volume: 168
   
Pages: 210 - 218
Abstract
The overall fracture resistance of a weldment with a propagating crack across the weld, HAZ and base material has been evaluated for a AISI type 316LN stainless steel (SS), based on coupled experimental-finite element analysis. Compact type (CT) specimens with initial crack tip in the weld, heat affected zone (HAZ) and base material have been tested to evaluate J-integral resistance curve (J-R curve) across the weldment. Towards evaluating the J-integral for a heterogeneous material, elastic component of J was determined using equivalent Young's modulus (Eeq) in terms of instantaneous compliance and crack depths. Simultaneously, finite element (FE) analyses have been carried out to estimate J-integrals for various contours across the weldment and for nodal singularities along interfaces, leading to a modified J-integral for overall weldment. The reasonable agreement among experimental J values from different regions with the modified J-integral values gives credence to this procedure to predict overall fracture resistance across the weldment over a heterogeneous microstructural gradient. © 2018 Elsevier Ltd
About the journal
JournalData powered by TypesetInternational Journal of Pressure Vessels and Piping
PublisherData powered by TypesetElsevier Ltd
ISSN03080161
Open AccessNo
Concepts (15)
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    Crack propagation
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    Crack tips
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    Elastic moduli
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    Fracture toughness
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    Heat affected zone
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    Heat resistance
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    316LN STAINLESS STEELS
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    ELASTIC COMPONENTS
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    EQUIVALENT YOUNG'S MODULUS
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    Fem analysis
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    HETEROGENEOUS MATERIALS
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    J integral
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    MICROSTRUCTURAL GRADIENTS
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    Weldments
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    Finite element method