1.1 This test method covers the determination of slow crackgrowth (SCG) parameters of advanced ceramics by using constantstress-rate flexural testing in which flexural strength isdetermined as a function of applied stress rate in a givenenvironment at ambient temperature. The strength degradationexhibited with decreasing applied stress rate in a specifiedenvironment is the basis of this test method which enables theevaluation of slow crack growth parameters of a material.
Note 1--This test method is frequently referred to as "dynamicfatigue" testing (Refs (1-3)) in which the term" fatigue" isused interchangeably with the term "slow crack growth." To avoidpossible confusion with the "fatigue" phenomenon of a materialwhich occurs exclusively under cyclic loading, as defined inDefinitions E1150, this test method uses the term "constantstress-rate testing" rather than "dynamic fatigue" testing.
Note 2--In glass and ceramics technology, static tests ofconsiderable duration are called "static fatigue" tests, a type oftest designated as stress-rupture (See Definitions E1150).
1.2 Values expressed in this test method are in accordance withthe International System of Units (SI) and Practice E380.
1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.