Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 657, Issue -, Pages 422-430Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.01.077
Keywords
Small punch test; Fracture toughness; Damage; Finite elements; ODD
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Funding
- Ministry of Science and Innovation of Spain [MAT2011-28796-CO3-03]
- University of Oviedo [UNOV-13-PF]
- Principado de Asturias Regional Government through the Severo Ochoa Scholarship Programme [BP12-160]
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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.
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