ASTM E1681-03(2013)
Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials

Standard No.

ASTM E1681-03(2013)

Release Date

2003

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM E1681-03(2013)e1

Latest

ASTM E1681-23e1

Scope

5.1 The parameters K_EAC or K_IEAC determined by this test method characterize the resistance to crack growth of a material with a sharp crack in specific environments under loading conditions in which the crack-tip plastic region is small compared with the crack depth and the uncracked ligament. The less restrictive thickness requirements of K_EAC are intended for those conditions in which the results are a strong function of the thickness of the specimen and the application requires the testing of specimens with thickness representative of the application. Since the chemical and mechanical influences cannot be separated, in some material/environment combinations, the thickness must be treated as a variable. A K_EAC or K_IEAC value is believed to represent a characteristic measurement of environment-assisted cracking resistance in a precracked specimen exposed to an environment under sustained tensile loading. A K_EAC or K_IEAC value may be used to estimate the relationship between failure stress and defect size for a material under any service condition, where the combination of crack-like defects, sustained tensile loading and the same specific environment would be expected to occur. (Background information concerning the development of this test method can be found in Refs (3-18).

5.1.1 The apparent K_EAC or K_IEAC of a material under a given set of chemical and electrochemical environmental conditions is a function of the test duration. It is difficult to furnish a rigorous and scientific proof for the existence of a threshold (4, 5). Therefore, application of K_EAC or K_IEAC data in the design of service components should be made with awareness of the uncertainty inherent in the concept of a true threshold for environment-assisted cracking in metallic materials (6, 18). A measured K_EAC or K_IEAC value for a particular combination of material and environment may, in fact, represent an acceptably low rate of crack growth rather than an absolute upper limit for crack stability. Care should be exercised when service times are substantially longer than test times.

5.1.2 The degree to which force deviations from static tensile stress will influence the apparent K_EAC or K_IEAC of a material is largely unknown. Small-amplitude cyclic loading, well below that needed to produce fatigue crack growth, superimposed on sustained tensile loading was observed to significantly lower the apparent threshold for stress corrosion cracking in certain instances (7, 8). Therefore, caution should be used in applying K_EAC or K_IEAC data to service situations involving cyclic loading. In addition, since this standard is for static loading, small-amplitude cyclic loading should be avoided during testing.

5.1.3......

ASTM E1681-03(2013) Referenced Document

• ASTM D1141 Standard Practice for the Preparation of Substitute Ocean Water
• ASTM E1823 Standard Terminology Relating to Fatigue and Fracture Testing
• ASTM E399 Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials
• ASTM E647 Standard Test Method for Measurement of Fatigue Crack Growth Rates
• ASTM E8/E8M Standard Test Methods for Tension Testing of Metallic Materials
• ASTM G1 Standard Practice for Preparing, Cleaning, and Evaluating Corrosion Test Specimens
• ASTM G15 Standard Terminology Relating to Corrosion and Corrosion Testing
• ASTM G5 Standard Reference Test Method for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements

ASTM E1681-03(2013) history

• 2023 ASTM E1681-23e1 Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
• 2023 ASTM E1681-23 Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
• 2020 ASTM E1681-03(2020) Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
• 2013 ASTM E1681-03(2013)e1 Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
• 2003 ASTM E1681-03(2013) Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
• 2003 ASTM E1681-03(2008)e2 Standard Test Method for Determining Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
• 2003 ASTM E1681-03(2008)e1 Standard Test Method for Determining a Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
• 2003 ASTM E1681-03(2008) Standard Test Method for Determining a Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
• 2003 ASTM E1681-03 Standard Test Method for Determining a Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials
• 1999 ASTM E1681-99e1 Standard Test Method for Determining a Threshold Stress Intensity Factor for Environment-Assisted Cracking of Metallic Materials