ASTM C1368

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 ambient temperature. 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.

This test method is frequently referred to as "dynamic fatigue" testing (Refs ()) 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 Definitions E 1823, this test method uses the term "constant stress-rate testing" rather than "dynamic fatigue" testing.

In glass and ceramics technology, static tests of considerable duration are called "static fatigue" tests, a type of test designated as stress-rupture (See Definitions E 1823).

1.2 Values expressed in this test method are in accordance with the International System of Units (SI) and IEEE/ASTM SI 10.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents

C1145 Terminology of Advanced Ceramics
C1161 Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature
C1239 Practice for Reporting Uniaxial Strength Data and Estimating Weibull Distribution Parameters for Advanced Ceramics
C1322 Practice for Fractography and Characterization of Fracture Origins in Advanced Ceramics
E1823 Terminology Relating to Fatigue and Fracture Testing
E337 Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
E4 Practices for Force Verification of Testing Machines
E6 Terminology Relating to Methods of Mechanical Testing
IEEE/ASTMSI10 American National Standard for Use of the International System of Units (SI): The Modern Metric System

Index Terms

advanced ceramics; constant stress-rate testing; flexural strength; flexural testing; four-point flexure; slow crack growth; slow crack growth parameters; ICS Number Code 81.060.30

Citing ASTM Standards

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