NIST Property Data Summaries for Fracture Toughness

Abbreviations and Other Notes:

Measurement Method Abbreviations:

AMDCB = Applied Moment Double Cantilever Beam CF = Controlled Flaw CNB = Chevron Notch Beam DCB = Double Cantilever Beam DT = Double Torsion HI = Hertzian Indentation ICS = Indentation Crack Size IS = Indentation Strength NDC = Notched Diametral Compression SCF = Surface Crack in Flexure SENB = Single-Edge Notched-Beam SEPB = Single-Edge Precracked Beam SR = Short Rod TDCB = Tapered Double Cantilever Beam WOF = Work of Fracture

Property Abbreviations:

E = elastic modulus (Young's modulus) H = hardness (Vickers hardness unless noted otherwise) nu = Poisson's ratio


SI units, unit symbols, and unit prefixes are used in the NIST Property Data Summaries.


No attempt has been made to assign uncertainties to the individual values obtained from the literature. A survey of data in the NIST Structural Ceramics Database indicates that relative combined standard uncertainties in the range of 5 % to 15 % are not unusual for fracture toughness measurements. Exceptional cases having reported uncertainties as low as 1 % or as high as 30 % can be found, but such cases are very unusual. For a comprehensive discussion on estimates of uncertainty, see "Guidelies for Evaluating and Expressing the Uncertainty of NIST Measurement Results," by B. N. Taylor and C. E. Kuyatt, NIST Technical Note 1297.

Data Summaries:

Fracture Toughness

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Date created: 08 February 2001
Last updated: 08 February 2001

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