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ASTM International - ASTM C1421-09

Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature

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Organization: ASTM International
Publication Date: 1 May 2009
Status: inactive
Page Count: 32
ICS Code (Advanced ceramics): 81.060.30
significance And Use:

Fracture toughness, KIc, is a measure of the resistance to crack extension in a brittle material. These test methods may be used for material development, material comparison, quality... View More

scope:

1.1 These test methods cover the fracture toughness, KIc, determination of advanced ceramics at ambient temperature. The methods determine KIpb (precracked beam test specimen), KIsc (surface crack in flexure), and KIvb (chevron-notched beam test specimen). The fracture toughness values are determined using beam test specimens with a sharp crack. The crack is either a straight-through crack formed via bridge flexure (pb), or a semi-elliptical surface crack formed via Knoop indentation (sc), or it is formed and propagated in a chevron notch (vb), as shown in Fig. 1.

Note 1-The terms bend(ing) and flexure are synonymous in these test methods.

1.2 These test methods are applicable to materials with either flat or with rising R-curves. Differences in test procedure and analysis may cause the values from each test method to be different. For many materials, such as the silicon nitride Standard Reference Material 2100, the three methods give identical results at room temperature in ambient air.

1.3 The fracture toughness values for a material can be functions of environment, test rate and temperature. These test methods give fracture toughness values for specific conditions of environment, test rate and temperature.

1.4 These test methods are intended primarily for use with advanced ceramics which are macroscopically homogeneous. Certain whisker- or particle-reinforced ceramics may also meet the macroscopic behavior assumptions. Single crystals may also be tested.

1.5 This standard begins with a main body that provides information on fracture toughness testing in general. It is followed by annexes and appendices with specific information for the particular test methods.

Main BodySection
Scope1
Referenced Documents2
Terminology (including definitions, orientation and symbols)3
Summary of Test Methods4
Significance and Use5
Interferences6
Apparatus7
Test Specimen Configurations, Dimensions and Preparations8
General Procedures9
Report (including reporting tables)11
Precision and Bias12
Keywords13
Summary of Changes
Annexes
Test Fixture GeometriesA1
Procedures and Special Requirements for Precracked Beam MethodA2
Procedures and Special Requirements for Surface Crack in Flexure MethodA3
Procedures and Special Requirements for Chevron Notch Flexure MethodA4
Appendices
Precrack Characterization, Surface Crack in Flexure MethodX1
Complications in Interpreting Surface Crack in Flexure PrecracksX2
Alternative Precracking Procedure, Surface Crack in Flexure MethodX3
Chamfer Correction Factors, Surface Crack in Flexure Method OnlyX4
Crack OrientationX5

1.6 Values expressed in these test methods are in accordance with the International System of Units (SI) and Practice E 380.

1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.8 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.

Note-The figures on the right show the test specimen cross sections and crack types. Four-point loading may be used with all three methods. Three-point may be used with the pb and vb specimens.

FIG. 1 The Three Test Methods

Document History

January 1, 2018
Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature
1.1 These test methods cover the fracture toughness, KIc, determination of advanced ceramics at ambient temperature. The methods determine KIpb (precracked beam test specimen), KIsc (surface crack in...
January 1, 2016
Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature
1.1 These test methods cover the fracture toughness, KIc, determination of advanced ceramics at ambient temperature. The methods determine KIpb (precracked beam test specimen), KIsc (surface crack in...
July 1, 2015
Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature
1.1 These test methods cover the fracture toughness, KIc, determination of advanced ceramics at ambient temperature. The methods determine KIpb (precracked beam test specimen), KIsc (surface crack in...
December 1, 2010
Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature
1.1 These test methods cover the fracture toughness, KIc, determination of advanced ceramics at ambient temperature. The methods determine KIpb (precracked beam test specimen), KIsc (surface crack in...
ASTM C1421-09
May 1, 2009
Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature
1.1 These test methods cover the fracture toughness, KIc, determination of advanced ceramics at ambient temperature. The methods determine KIpb (precracked beam test specimen), KIsc (surface crack in...
February 1, 2007
Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature
1.1 These test methods cover the fracture toughness determination of K Ipb (precracked beam test specimen), K Isc (surface crack in flexure), and K Ivb (chevron-notched beam test specimen) of...
October 10, 2001
Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperature
1.1 These test methods cover the fracture toughness determination of KIpb (precracked beam specimen), KIsc (surface crack in flexure), and KIvb (chevron-notched beam specimen) of advanced ceramics at...
October 10, 2001
Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperatures
1.1 These test methods cover the fracture toughness determination of KIpb (precracked beam specimen), KIsc (surface crack in flexure), and KIvb (chevron-notched beam specimen) of advanced ceramics at...
October 10, 2001
Standard Test Methods for Determination of Fracture Toughness of Advanced Ceramics at Ambient Temperatures
1.1 These test methods cover the fracture toughness determination of KIpb (precracked beam specimen), KIsc (surface crack in flexure), and KIvb (chevron-notched beam specimen) of advanced ceramics at...
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