Standard Practice for Making and Using U-Bend Stress-Corrosion Test Specimens

Importancia y uso:

5.1 The U-bend specimen may be used for any metal alloy sufficiently ductile to be formed into the U-shape without mechanically cracking. The specimen is most easily made from strip or sheet but can be machined from plate, bar, castings, or weldments; wire specimens may be used also.

5.2 Since the U-bend usually contains large amounts of elastic and plastic strain, it provides one of the most severe tests available for smooth (as opposed to notched or precracked) stress-corrosion test specimens. The stress conditions are not usually known and a wide range of stresses exist in a single stressed specimen. The specimen is therefore unsuitable for studying the effects of different applied stresses on stress-corrosion cracking or for studying variables that have only a minor effect on cracking. The advantage of the U-bend specimen is that it is simple and economical to make and use. It is most useful for detecting large differences between the stress-corrosion cracking resistance of (a) different metals in the same environment, (b) one metal in different metallurgical conditions in the same environment, or (c) one metal in several environments.

Subcomité:

G01.06

Referida por:

G0035-23, G0123-00R22E01, G0041-90R18, G0052-20, C0692-13R23, G0039-99R21, G0037-98R21, G0058-85R23, G0103-97R23E01, G0157-24, G0036-94R18, G0111-21A

Volúmen:

03.02

Número ICS:

77.060 (Corrosion of metals)

Palabras clave:

plastic strain; stress-corrosion cracking; stress-corrosion test specimen; U-bends;