ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 5

Determination of Fracture Toughness for Brittle Nonmetallic Materials at the Subcritical Crack Growth Stage

Naumenko, VP
Senior Scientific Workers, Institute for Problems of Strength, Academy of Sciences of the UkrSSR, USSR, Kiev,

Abstract

In addition to the K_Ic characteristics of such brittle materials as glass-like and ceramic ones, it is proposed to determine the values of K_Io and K_Ii, corresponding to the crack onset and the beginning of the accelerated stage of its subcritical growth. An experimental method has been developed: to grow a given edge crack in a flat specimen, to determine the values of K_Io and K_Ii by loading this specimen in transverse compression and then, in the course of eccentric tension (wedging) of the same specimen, to evaluate the K_Ic characteristics. The validity of the K_Io, K_Ii and K_Ic values obtained for glass and polymethyl methacrylate (PMMA) is confirmed by their comparison with the data published.

Keywords:
fracture toughness, fracture toughness testing, subcritical crack growth, stress intensity factors, brittle nonmetallic materials

Paper ID: JTE10325J
DOI: 10.1520/JTE10325J
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