Intrinsic criterion of plastic instability

✍ Scribed by H. Moritoki; E. Okuyama

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 662 KB
• Volume: 60
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/0924-0136(96)02400-4

✦ Synopsis

Hitherto the approaches on plastic instability have been carried out mainly in evaluating sheet formability. The necking in press forming is a phenomenon relating to plastic instability. It is classified into diffuse and localized neckings. Swift [1] proposed the criterion of diffuse necking, and for localized necking StOren and Rice [3] presented the modified criterion of Hill's [2] in order to make it possible to predict the formability in biaxial stretching. Since there is some imperfections in these criteria and they do not provide sufficient conditions for the emergence of necking phenomena, they must be improved. This paper presents comprehensive criteria based on the multiplicity of solution.