The transition between stress corrosion crack growth and plastic fracture—II. The effect of loading pattern

✍ Scribed by E. Smith

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 556 KB
• Volume: 20
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(84)90056-0

✦ Synopsis

&a&a&--The paper addresses the problem of predicting the onset of plastic fracture at the tip of a growing stress corrosion crack, using data from laboratory fracture mechanics tests, A theoretical analysis for a particular model: namely that of the plane strain deformation of a solid with two symmetrically situated deep cracks, and with tension of the small remaining ligament, shows that plastic fracture occurs at a J value that is not constant, but depends on whether the loading is load or displacement control. This result, which is valid for materials for which the onset of crack extension and unstable fracture are coincident in a rising load fracture mechanics test, provides valuable support for the view that great care must be exercised when using fracture mechanics procedures to predict the transition between stress corrosion crack growth and plastic fracture in such materials.