A numerical investigation on the geometry dependence of the crack growth resistance in CT specimens

✍ Scribed by G. X. Shan; O. Kolednik; F. D. Fischer

• Publisher: Springer Netherlands
• Year: 1994
• Tongue: English
• Weight: 973 KB
• Volume: 66
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00020082

✦ Synopsis

The influence of the specimen thickness B and the ligament length b on the Jn-curves is numerically investigated for CT specimens. The thickness effect is taken into account with 2-D analyses by dividing a plain sided specimen into a plane stress part and a plane strain part. The fracture process is controlled by experimentally determined critical values of the crack tip opening displacement for crack growth initiation (CTOD,) and the crack tip opening angle for stable crack growth (CTOAc). It is shown that for the global behaviour of a plain sided specimen, the B/b ratio is essential. The difference between the geometry dependence of the initiation value of the J-integral and the geometry dependence of the slope of the Ja-curves is also shown.