ASTM-E740 2003

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E740-03 Standard Practice for Fracture Testing with Surface-Crack Tension Specimens

Published By	Publication Date	Number of Pages
ASTM	2003	9

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Categories: 77.040.10 - Mechanical testing of metals, ASTM

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Description

ASTM E740-03

Historical Standard: Standard Practice for Fracture Testing with Surface-Crack Tension Specimens

ASTM E740

Scope

1.1 This practice covers the design, preparation, and testing of surface-crack tension (SCT) specimens. It relates specifically to testing under continuously increasing force and excludes cyclic and sustained loadings. The quantity determined is the residual strength of a specimen having a semielliptical or circular-segment fatigue crack in one surface. This value depends on the crack dimensions and the specimen thickness as well as the characteristics of the material.

1.2 Metallic materials that can be tested are not limited by strength, thickness, or toughness. However, tests of thick specimens of tough materials may require a tension test machine of extremely high capacity. The applicability of this practice to nonmetallic materials has not been determined.

1.3 This practice is limited to specimens having a uniform rectangular cross section in the test section. The test section width and length must be large with respect to the crack length. Crack depth and length should be chosen to suit the ultimate purpose of the test.

1.4 Residual strength may depend strongly upon temperature within a certain range depending upon the characteristics of the material. This practice is suitable for tests at any appropriate temperature.

1.5 Residual strength is believed to be relatively insensitive to loading rate within the range normally used in conventional tension tests. When very low or very high rates of loading are expected in service, the effect of loading rate should be investigated using special procedures that are beyond the scope of this practice.

Note 1—Further information on background and need for this type of test is given in the report of ASTM Task Group E24.01.05 on Part-Through-Crack Testing (1).

1.6 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.

Keywords

residual strength; surface crack; tensile force

ICS Code

ICS Number Code 77.040.10 (Mechanical testing of metals)

DOI: 10.1520/E0740-03

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Significance and Use Apparatus Test Specimen
3	Procedure Report FIG. 1
4	Keywords A1. FATIGUE CRACK SIZE AND SHAPE CONTROL A1.1 A1.2 A1.3 FIG. 2
5	A2. STRESS INTENSITY FACTOR EQUATIONS A2.1 A2.2 A2.3 A2.4
6	X1. METHODS FOR FURTHER ANALYSIS X1.1 X1.2 FIG. A2.1
7	X1.3 X1.4 X2. CRACK MOUTH OPENING DISPLACEMENT X2.1 X2.2 X2.3
8	X3. TEST PLAN X3.1 X3.2 X3.3 X3.4 REFERENCES FIG. X2.1

Additional information

Standard Title	E740-03 Standard Practice for Fracture Testing with Surface-Crack Tension Specimens
Published Code	ASTM
Publication Date	2003
Pages Count	9
ICS Codes	77.040.10 - Mechanical testing of metals