Stress corrosion crack branching in high-strength steels

✍ Scribed by C.S. Carter

• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 811 KB
• Volume: 3
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(71)90047-6

✦ Synopsis

The criteria for stress corrosion crack branching in high-strength steels are shown to be (1) a constant crack velocity and (2) attainment of a critical stress intensity Klb. For the steels investigated, values of K,b I K,,,, range from 2 to 4. This indicates that when K,, /K,, exceeds 0.5, rapid brittle fracture will occur before Klb can be reached.

NOTATION plane-strain stress intensity factor (ksi&.) critical stress intensity factor for crack branching (ksiV'&.) plane-strain fracture toughness (ksi fi.) stress intensity factor at which crack growth rate deviates from constant velocity (ksi 6.) initial stress intensity (ksi fi) plane-strain threshold stress intensity factor below which stress corrosion cracking does not occur (ksi V%.) critical stress intensity factor for terminal fracture (ksi X&.) ratto of Kd K,, or Klbl K,,,, yield strength (ksi).