A method for evaluating resistance to stress-corrosion cracking of high-strength aluminum alloy by the use of pre-cracked DCB specimen

A method for evaluating resistance to stress-corrosion cracking of high-strength aluminum alloy by the use of pre-cracked DCB specimen

Creators Ohsaki Shuhei

This paper describes a method for evaluating the resistance to stress-corrosion cracking (SCC) in short-transverse direction of thick wrought plate of Al-Zn-Mg 7N01 alloy, using compact pre-cracked double cantilever beam (DCB) specimens. The stress-intensity determination for the DCB specimen is performed, and a valid fracture toughness value has been obtained. SCC growth rate da/dt as a function of K_1 have been determined for the specimens with different aging treatments in a sodium chloride solution. Rankings of da/dt corresponding to region II are the same as those of the SCC resistance developed with smooth specimen data. The SCC test method by the use of the DCB specimen provides the threshold stress-intensity values K_<ISCC> and permits a more rational material characterization.

[ISSN]0386-3433

[NCID]AA0086073X