Subsized Specimens for Fracture Resistance Characterisation Including Transferability Issues

Abstract:

The contribution is focused on characterization of methods enabling to apply small/subsized specimens for fracture resistance characterization. The applied methods are divided into transition region and upper shelf region. The approaches used in the upper shelf region represent at the same time methods applicable for ductile materials without transition. Relating to subsized samples two basic approaches are applicable: (i) miniaturized samples based on common standard ones and (ii) specific specimens/methods, e.g. small punch test etc. The results described in the paper belong to the first group. For interpretation of data generated under low constraint conditions toughness scaling models and master curve approached are commented. In ductile region, either the sample used generate valid toughness characteristics, or, if not, there is no way how to correct measured data except damage quantification through micromechanical models.

• Periodical: Key Engineering Materials (Volume 741)
• Pages: 110-115
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.741.110
• Online since: June 2017
• Authors: Ivo Dlouhý*, Luděk Stratil, Filip Šiška
• Keywords: Crack Resistance Curve, Crack Tip Constraint, Fracture Toughness, Subsized Specimen, Transferability

References

[1] M. Holzmann, I. Dlouhy, M. Brumovsky: Measurement of fracture toughness transition of CrNiMoV pressure vessel steel using pre-cracked Charpy specimens, Int J Pres Ves Pip, 76, 1999, 9, 591-598.

DOI: 10.1016/s0308-0161(99)00041-1

[2] I. Dlouhy, V. Kozak, L. Valka et al.: The susceptibility of local parameters to steel microstructure evaluated using Charpy type specimen, J Phys IV, C6, 1996, 205-214.

DOI: 10.1051/jp4:1996620

[3] T. L. Anderson, R.H. Dodds: Specimen size requirements for fracture toughness testing in the transition region, J Test Eval, 19, 1991, 123-134.

DOI: 10.1520/jte12544j

[4] I. Dlouhy et al.: Micromechanical aspects of constraint effect at brittle fracture initiation, in: The Transferability of Fracture Mechanical Characteristics, I. Dlouhy ed., Kluwer, (2002).

DOI: 10.1007/978-94-010-0608-8_5

[5] T. Linse, M. Kuna, H. W. Viehrig: Quantification of brittle-ductile failure behavior of ferritic RPV steels using the Small-Punch-Test, Mater Sci Eng A, 614, 2014, 136-147.

DOI: 10.1016/j.msea.2014.05.095

[6] T. Smida, J. Babjak, I. Dlouhy: Prediction of fracture toughness temperature dependence from tensile test parameters, Kovove Mater – Met Mater, 48, 2010, 6, 345-352.

DOI: 10.4149/km_2010_6_345

[7] R. H. Dodds Jr, C. Ruggieri, K. Koppenhoefer: 3D constraint effects on models for transferability of cleavage fracture toughness, In: Fatigue and Fracture Mechanics, ASTM STP 1321, Underwood, MacDonald & Mitchell, Eds., 1997, 179-197.

DOI: 10.1520/stp12308s

[8] X. Gao, R.H. Dodds Jr.: An engineering approach to assess constraint effects on cleavage fracture toughness, Eng Fract Mech, 68, 2001, 263-283.

DOI: 10.1016/s0013-7944(00)00102-8

[9] F. Minami, M. Ohata, et al.: Method of constraint loss correction of CT fracture toughness for fracture assessment of steel components, Eng Fract Mech, 73, 2006, 14, 1996-(2020).

DOI: 10.1016/j.engfracmech.2006.03.013

[10] L. Stratil, F. Siska, I. Dlouhy, M. Serrano: The application of miniaturized three-point-bend specimens for determination of the reference temperature of JRQ steel, in Pressure Vessel and Piping, ASME conference, Boston, 2015, 6. p.

DOI: 10.1115/pvp2015-45706

[11] L. Stratil: Determination of fracture mechanical characteristics from sub-size specimens, PhD Thesis, 2014, Brno University of Technology.

[12] ASTM E1820-15, Standard Test Method for Measurement of Fracture Toughness, 2015, Annual Book of ASTM Standards, ASTM International, West Conshohocken, PA, (2015).

[13] ASTM E1921-13, Standard Test Method for Determination of Reference Temperature, T0, for Ferritic Steels in the Transition Range, ASTM International, West Conshohocken, PA, (2013).

DOI: 10.1520/e1921-22

[14] M. Serrano: Evaluación computacional del efecto de la pérdida de constricción en la tenacidad de fractura de la vasija de reactores nucleares, PhD Thesis, 2007, Polytechnical Univ. Madrid.

DOI: 10.20868/upm.thesis.1012

[15] C. Berdin, J. Besson, S. Bugat, et al., Local Approach to Fracture, École des Mines de Paris, 2004, p.442.