Measurement of fracture toughness of materials with non-uniform microstructure based on spiral notch torsion test

Wei Zhang, Zhili Feng, Jy An Wang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Scopus citations

Abstract

Materials such as welds consist of highly non-uniform distribution of microstructure. It is typically difficult to measure fracture toughness of those materials using the conventional testing approaches such as ASTM compact tension test, since the non-uniform microstructure can induce irregular crack propagation front. In this study, the spiral notch torsion test(SNTT)is enhanced to measure the fracture toughness of welds. Thetestspecimen resembles a round tensile bar with a spiral-shaped notch on the circumference. To introduce non-uniform microstructure, the heat treatment with a Gleeble system is used to rapidly heat and quench the specimen. the heating and cooling rates applied are typical of those experienced in welding. the hardness distribution inthe axial directionof as-heat-treated specimen has a bell shape centered in the middle of the specimen. This distribution resembles that in a transverse section of a weldment. During loading, the specimen is twisted about its axis. It is possible to achieve a Mode I crack front that is long enough to meet the plain strain state and other fracture mechanics requirements for testing the local toughness of weld region. Fracture toughness calculation based on finite element analysis is performed to convert the recordedload-displacementinto the fracture toughness KIc.

Original languageEnglish
Title of host publicationAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Pages223-228
Number of pages6
DOIs
StatePublished - 2010
EventASME 2010 Pressure Vessels and Piping Division/K-PVP Conference, PVP2010 - Bellevue, WA, United States
Duration: Jul 18 2010Jul 22 2010

Publication series

NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume6
ISSN (Print)0277-027X

Conference

ConferenceASME 2010 Pressure Vessels and Piping Division/K-PVP Conference, PVP2010
Country/TerritoryUnited States
CityBellevue, WA
Period07/18/1007/22/10

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