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

Units:

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

Uncertainties:

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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