ASTM G168-00(2013)
Standard Practice for Making and Using Precracked Double Beam Stress Corrosion Specimens

Standard No.

ASTM G168-00(2013)

Release Date

2000

Published By

American Society for Testing and Materials (ASTM)

Status

Be replaced

Replace By

ASTM G168-17

Latest

ASTM G168-17

Scope

5.1 Precracked specimens offer the opportunity to use the principles of linear elastic fracture mechanics (1)⁴ to evaluate resistance to stress corrosion cracking in the presence of a pre-existing crack. This type of evaluation is not included in conventional bent beam, C-ring, U-bend, and tension specimens. The precracked double beam specimen is particularly useful for evaluation of materials that display a strong dependence on grain orientation. Since the specimen dimension in the direction of applied stress is small for the precracked double beam specimen, it can be successfully used to evaluate short transverse stress corrosion cracking of wrought products, such as rolled plate or extrusions. The research applications and analysis of precracked specimens in general, and the precracked double beam specimen in particular, are discussed in Appendix X1.

5.2 The precracked double beam specimen may be stressed in either constant displacement or constant load. Constant displacement specimens stressed by loading bolts or wedges are compact and self-contained. By comparison, constant load specimens stressed with springs (for example, proof rings, discussed in Test Method G49, 7.2.1.2) or by deadweight loading require additional fixtures that remain with the specimen during exposure.

5.3 The recommendations of this practice are based on the results of interlaboratory programs to evaluate precracked specimen test procedures (2,3) as well as considerable industrial experience with the precracked double beam specimen and other precracked specimen geometries (4-8).

1.1 This practice covers procedures for fabricating, preparing, and using precracked double beam stress corrosion test specimens. This specimen configuration was formerly designated the double cantilever beam (DCB) specimen. Guidelines are given for methods of exposure and inspection.

1.2 The precracked double beam specimen, as described in this practice, is applicable for evaluation of a wide variety of metals exposed to corrosive environments. It is particularly suited to evaluation of products having a highly directional grain structure, such as rolled plate, forgings, and extrusions, when stressed in the short transverse direction.

1.3 The precracked double beam specimen may be stressed in constant displacement by bolt or wedge loading or in constant load by use of proof rings or dead weight loading. The precracked double beam specimen is amenable to exposure to aqueous or other liquid solutions by specimen immersion or by periodic dropwise addition of solution to the crack tip, or exposure t......

ASTM G168-00(2013) Referenced Document

• ASTM D1193 Standard Specification for Reagent 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 G15 Standard Terminology Relating to Corrosion and Corrosion Testing
• ASTM G35 Standard Practice for Determining the Susceptibility of Stainless Steels and Related Nickel-Chromium-Iron Alloys to Stress-Corrosion Cracking in Polythionic Acids
• ASTM G36 Standard Practice for Evaluating Stress-Corrosion-Cracking Resistance of Metals and Alloys in a Boiling Magnesium Chloride Solution
• ASTM G37 Standard Practice for Use of Mattsson's Solution of pH 7.2 to Evaluate the Stress-Corrosion Cracking Susceptibility of Copper-Zinc Alloys
• ASTM G41 Standard Practice for Determining Cracking Susceptibility of Metals Exposed Under Stress to a Hot Salt Environment
• ASTM G44 Standard Practice for Exposure of Metals and Alloys by Alternate Immersion in Neutral 3.5?% Sodium Chloride Solution
• ASTM G49 Standard Practice for Preparation and Use of Direct Tension Stress-Corrosion Test Specimens
• ASTM G50 Standard Practice for Conducting Atmospheric Corrosion Tests on Metals

ASTM G168-00(2013) history

• 2017 ASTM G168-17 Standard Practice for Making and Using Precracked Double Beam Stress Corrosion Specimens
• 2000 ASTM G168-00(2013) Standard Practice for Making and Using Precracked Double Beam Stress Corrosion Specimens
• 2000 ASTM G168-00(2006) Standard Practice for Making and Using Precracked Double Beam Stress Corrosion Specimens
• 2000 ASTM G168-00 Standard Practice for Making and Using Precracked Double Beam Stress Corrosion Specimens