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Measurement of Dynamic Impact Toughness on Impact-Tested Precracked Charpy Specimens

Published

Author(s)

Enrico Lucon

Abstract

The Fraunhofer Institute for Mechanics of Materials (IWM, Freiburg, Germany) and the Materials Testing Institute University of Stuttgart (MPA Stuttgart, Germany) have recently launched a joint collaboration project titled “Dynamic Mastercurves II” (MC-Dyn II). The project focuses on the measurement of the ductile-to-brittle transition toughness at impact loading rates by means of fatigue precracked and side-grooved Charpy-type specimens (PCC specimens). IWM and MPA invited NIST Boulder to contribute to the project by testing PCC specimens of a reactor pressure vessel (RPV) steel and determining the dynamic Master Curve reference temperature, T0,d, in accordance with ASTM E1921-14a. Tests at NIST were performed on an instrumented impact machine at 0 °C and with impact velocity v0 ≈ 1.21 m/s. The calculated reference temperature T0,d = -6.6 °C, corresponding to an average loading rate of 3.3 × 105 MPa√m/s, is in excellent agreement with the results previously published by MPA under similar conditions (T0,d = -7 °C). To the author’s knowledge, these are the first tests of this type ever performed at NIST Boulder.
Citation
NIST Interagency/Internal Report (NISTIR) - 8065
Report Number
8065

Keywords

Dynamic fracture toughness, dynamic reference temperature, impact loading rates, instrumented Charpy tests, Master Curve, precracked Charpy-type (PCC) specimens, reactor pressure vessel steel.

Citation

Lucon, E. (2015), Measurement of Dynamic Impact Toughness on Impact-Tested Precracked Charpy Specimens, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.IR.8065 (Accessed April 20, 2024)
Created June 18, 2015, Updated November 10, 2018