ASTM C1368-01

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C 1368 – 01
Standard Test Method for
Determination of Slow Crack Growth Parameters of
Advanced Ceramics by Constant Stress-Rate Flexural
1
Testing at Ambient Temperature
This standard is issued under the fixed designation C 1368; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
3
1. Scope Ceramics at Ambient Temperature
C 1239 Practice for Reporting Uniaxial Strength Data and
1.1 This test method covers the determination of slow crack
Estimating Weibull Distribution Parameters for Advanced
growth (SCG) parameters of advanced ceramics by using
3
Ceramics
constant stress-rate flexural testing in which flexural strength is
C 1322 Practice for Fractography and Characterization of
determined as a function of applied stress rate in a given
3
Fracture Origins in Advanced Ceramics
environment at ambient temperature. The strength degradation
4
E 4 Practices for Force Verification of Testing Machines
exhibited with decreasing applied stress rate in a specified
E 6 Terminology Relating to Methods of Mechanical Test-
environment is the basis of this test method which enables the
4
ing
evaluation of slow crack growth parameters of a material.
E 337 Test Method for Measuring Humidity with a Psy-
NOTE 1—This test method is frequently referred to as “dynamic
chrometer (the Measurement of Wet-Bulb and Dry-Bulb
2
fatigue” testing (Refs (1-3) ) in which the term“ fatigue” is used
5
Temperatures)
interchangeably with the term “slow crack growth.” To avoid possible
E 380 Practice for Use of the International System of Units
confusion with the “fatigue” phenomenon of a material which occurs
6
(SI) (The Modernized Metric System)
exclusivelyundercyclicloading,asdefinedinDefinitionsE 1150,thistest
method uses the term “constant stress-rate testing” rather than “dynamic E 1823 Terminology Relating to Fatigue and Fracture Test-
4
fatigue” testing.
ing
NOTE 2—In glass and ceramics technology, static tests of considerable
2.2 Military Handbook:
duration are called “static fatigue” tests, a type of test designated as
MIL-HDBK-790 Fractography and Characterization of
stress-rupture (See Definitions E 1150).
7
Fracture Origins in Advanced Structural Ceramics
1.2 Values expressed in this test method are in accordance
3. Terminology
with the International System of Units (SI) and Practice E 380.
1.3 This standard does not purport to address all of the
3.1 Definitions—The terms described in Terminology
safety concerns, if any, associated with its use. It is the
C 1145, Terminology E 6, Terminology E 616, and Definitions
responsibility of the user of this standard to establish appro-
E 1150 are applicable to this test method. Specific terms
priate safety and health practices and determine the applica-
relevant to this test method are as follows:
bility of regulatory limitations prior to use.
3.1.1 advanced ceramic, n—a highly engineered, high-
performance, predominately nonmetallic, inorganic, ceramic
2. Referenced Documents
material having specific functional attributes. (C 1145)
2.1 ASTM Standards:
3.1.2 constant stress rate,s˙, n—a constant rate of maximum
C 1145 Terminology of Advanced Ceramics
stress applied to a specified beam by using either a constant
C 1161 Test Method for Flexural Strength of Advanced
loading or constant displacement rate of a testing machine.
3.1.3 environment, n—the aggregate of chemical species
and energy that surrounds a test specimen. (E 1150)
1
This test method is under the jurisdiction of ASTM Committee C28 on
3
Advanced Ceramics and is the direct responsibility of Subcommittee C28.01 on Annual Book of ASTM Standards, Vol 15.01.
4
Properties and Performance. Annual Book of ASTM Standards, Vol 03.01.
5
Current edition approved June 10, 2001. Published June 2001. Originally Annual Book of ASTM Standards, Vol 11.03.
6
published as C 1368 – 97. Last previous edition C 1368 – 00. Annual Book of ASTM Standards, Vol 14.02.
2 7
The boldface numbers in parentheses refer to the list of references at the end of Available from Army Research Laboratory—Materials Directorate, Aberdeen
this standard. Proving Ground, MD 21005.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C 1368
3.1.4 environmental chamber, n—the container of bulk between practical configurations and resulting errors, as dis-
volume surrounding a test specimen. (E 1150) cussed in Refs (4, 5). Only the four-point test configuration is
3.1.5 flexural strength, s , n—a measure of the strength of a used in this test method.
f
s
...