Determining cohesive parameters for modeling interfacial fracture in dissimilar-metal friction stir welded joints

Predicting the structural performance of a joint requires mechanical characterization of the interface that results from the joining process. Use of the cohesive zone model (CZM) is a popular approach for investigating fractures, seams, and joints in the structures. The CZM requires a cohesive const...

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Bibliographic Details
Published inInternational journal of solids and structures Vol. 216; no. C
Main Authors Kulkarni, Shank S., Gupta, Varun, Ortiz, Angel, Das, Hrishikesh, Upadhyay, Piyush, Barker, Erin, Herling, Darrell
Format Journal Article
LanguageEnglish
Published United States Elsevier 01.05.2021
Subjects
characterization
Cohesive zone model
finite elements method
fracture
MATERIALS SCIENCE
peel test
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ISSN0020-7683
1879-2146

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Summary:Predicting the structural performance of a joint requires mechanical characterization of the interface that results from the joining process. Use of the cohesive zone model (CZM) is a popular approach for investigating fractures, seams, and joints in the structures. The CZM requires a cohesive constitutive law, which, in the context of a welded joint, relates the traction at the interface to the separation displacement of the two surfaces. Additionally, typical congurations for fracture testing to obtain the parameters for a cohesive law involve assumptions including large weld areas and undisturbed substrate, making those techniques unsuitable for friction stir welded joints. This paper presents an approach of experimentation combined with nite element modeling to determine the cohesive law parameters to mechanically characterize the interface obtained in friction stir welded joints.
Bibliography:PNNL-SA-153218
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
USDOE
AC05-76RL01830
ISSN:0020-7683
1879-2146