GB/T 15970.6-2007
Corrosion of metals and alloys.Stress corrosion testing.Part 6: Preparation and use of pre-cracked specimens for tests under constant load or constant displacement (English Version)

Standard No.: GB/T 15970.6-2007
Language: Chinese, Available in English version
Release Date: 2007
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 15970.6-2007
Replace: GB/T 15970.6-1998

Scope: 1.1 This part of GB/T 15970 covers the design, preparation and use of pre-cracked specimens for the study of stress corrosion susceptibility. Recommendations are given for the design, preparation and use of pre-cracked specimens for the study of stress corrosion susceptibility. See Appendix A for recommendations on notched specimens. The term "metal" as used in this section also includes alloys. 1.2 Because of the requirement to maintain elastic restraint at the crack tip, pre-cracked specimens are not suitable for evaluating thin or thin materials such as sheet or wire. Usually only suitable for evaluating thicker or coarser materials such as thick plates, rods and forgings. Pre-cracked specimens are also suitable for weldments. 1.3 The pre-cracked sample can be loaded with constant load equipment, or with a device that can generate constant displacement at the point of force application. The incremental load and incremental displacement tests are introduced in GB/T l5970.9. 1.4 The outstanding advantage of the pre-cracked sample is that the measured data can be used to calculate the limit defect size of the known geometric shape and bearing the known stress. If the defect size exceeds the critical value, stress corrosion cracking will occur. Pre-cracked specimens can also be used to determine the growth rate of stress corrosion cracks. Recent data can be considered when monitoring defective parts in use.

GB/T 15970.6-2007 Referenced Document

GB/T 15970.1 Corrosion of metals and alloys.Stress corrosion testing.Part 1:General guidance on testing procedures*， 2018-05-14 Update
GB/T 20120.2 Corrosion of metals and alloys.Corrosion fatigue testing.Part 2: Crack propagation testing using precracked specimens

2007 GB/T 15970.6-2007 Corrosion of metals and alloys.Stress corrosion testing.Part 6: Preparation and use of pre-cracked specimens for tests under constant load or constant displacement
1998 GB/T 15970.6-1998 Corrosion of metals and alloys--Stress corrosion testing--Part 6: Preparation and use of pre-cracked specimens