Fracture toughness characterization through notched small punch test specimens

Emilio Martínez Pañeda, Tomas E. Garcia, Cristina Rodriguez

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

In this work a novel methodology for fracture toughness characterization by means of the small punch test (SPT) is presented. Notched specimens are employed and fracture resistance is assessed through a critical value of the notch mouth displacement delta(SPT). Finite element simulations and interrupted experiments are used to track the evolution of delta(SPT) as a function of the punch displacement. The onset of crack propagation is identified by means of a ductile damage model and the outcome is compared to the crack tip opening displacement estimated from conventional tests at crack initiation. The proposed numerical-experimental scheme is examined with two different grades of CrMoV steel and the differences in material toughness captured. Limitations and uncertainties arising from the different damage phenomena observed in the lowest toughness material examined are thoroughly discussed. (C) 2016 Elsevier B.V. All rights reserved.
Original languageEnglish
JournalMaterials Science and Engineering: A - Structural Materials: Properties, Microstructure and Processing
Volume657
Pages (from-to)422-430
ISSN0921-5093
DOIs
Publication statusPublished - 2016
Externally publishedYes

Keywords

  • CTOD
  • Damage
  • Finite elements
  • Fracture toughness
  • Small punch test

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