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1.1 ,This test method covers the determination of slow crack growth (SCG) parameters of advanced ceramics by using constant stress-rate flexural testing in which flexural strength is determined as a function of applied stress rate in a given environment at elevated temperatures. The strength degradation exhibited with decreasing applied stress rate in a specified environment is the basis of this test method which enables the evaluation of slow crack growth parameters of a material.
Note 1: ,This test method is frequently referred to as “,dynamic fatigue”, testing (1-3)2 in which the term “,fatigue”, is used interchangeably with the term “,slow crack growth.”, To avoid possible confusion with the “,fatigue”, phenomenon of a material which occurs exclusively under cyclic loading, as defined in Terminology E1823, this test method uses the term “,constant stress-rate testing”, rather than “,dynamic fatigue”, testing.