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ASTM-E1304:2008 Edition

ASTM-E1304:2008 Edition

$44.96

E1304-97(2008) Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials

Published By Publication Date Number of Pages
ASTM 2008 11
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1.1 This test method covers the determination of plane-strain (chevron-notch) fracture toughnesses, K Iv or K IvM , of metallic materials. Fracture toughness by this method is relative to a slowly advancing steady state crack initiated at a chevron-shaped notch, and propagating in a chevron-shaped ligament (Fig. 1). Some metallic materials, when tested by this method, exhibit a sporadic crack growth in which the crack front remains nearly stationary until a critical load is reached. The crack then becomes unstable and suddenly advances at high speed to the next arrest point. For these materials, this test method covers the determination of the plane-strain fracture toughness, K Ivj or K IvM , relative to the crack at the points of instability.

Note 1One difference between this test method and Test Method E 399 (which measures K Ic ) is that Test Method E 399 centers attention on the start of crack extension from a fatigue precrack. This test method makes use of either a steady state slowly propagating crack, or a crack at the initiation of a crack jump. Although both methods are based on the principles of linear elastic fracture mechanics, this difference, plus other differences in test procedure, may cause the values from this test method to be larger than K Ic values in some materials. Therefore, toughness values determined by this test method cannot be used interchangeably with K Ic .

1.2 This test method uses either chevron-notched rod specimens of circular cross section, or chevron-notched bar specimens of square or rectangular cross section (Figs. 1-10). The terms short rod and short bar are used commonly for these types of chevron-notched specimens.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 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.

PDF Catalog

PDF Pages PDF Title
1 Scope
Referenced Documents
Terminology
2 FIG. 1
3 Summary of Test Method
FIG. 2
FIG. 3
4 FIG. 4
FIG. 5
FIG. 6
FIG. 7
5 Significance and Use
FIG. 8
FIG. 9
FIG. 10
TABLE 1
6 TABLE 2
TABLE 3
TABLE 4
7 Specimen, Size, Configuration, Dimensions, and Preparation
Apparatus
TABLE 5
TABLE 6
8 Procedure
Calculation and Interpretation of Results
10 Report
Precision and Bias
A1. CALCULATIONS OF PLANE STRAIN FRACTURE TOUGHNESS USING ONLY THE MAXIMUM LOAD
A1.1
A1.2
A1.3
A1.4
11 A2. CALCULATING CONDITIONAL VALUE FOR KQvM
A2.1
A2.2
REFERENCES

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