The detection of slow crack growth in crack opening displacement specimens using an electrical potential method

✍ Scribed by J.M. Lowes; G.D. Featnehough

• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 482 KB
• Volume: 3
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(71)90002-6

✦ Synopsis

The potential drop method as used in fatigue and fracture toughness testing has been applied to tests on COD specimens. These tests showed that providing electrical stability is maintained, the method can be used to detect the onset of ductile crack growth. Initial plastic deformation (in absence of crack growth) gives rise to a potential change which is directly proportional to the amount of crack opening. Direct observations show that the initiation of crack growth is accompanied by an inflection in the potential]COD curve, The amount of any further potential change is related to the extent of crack growth although precise quantitative predictions of crack length cannot be made at present.