Author(s)

G.X. Shan, O. Kolednik & F.D. Fischer

Abstract

Numerical investigations of stable crack growth in CT-specimens of SAE4340 steel G.X. Shan," O. Kolednik,* F.D. Fischer" " Institute of Mechanics, Leoben University for Mining and Metallurgy, and Christian-Doppler-Laboratory for Micromechanics of Materials, Leoben, Austria * Erich-Schmid-Institute of Solid State Physics, Austrian Academy of Sciences, Leoben, Austria ABSTRACT A numerical simulation of the stable crack growth in a plain sided CT- specimen of a high strength steel with 2D elastic-plastic FE analyses is presented. The different fracture behaviors in the center and near the side surfaces of the specimen were accounted for by using the plane strain analy- sis for the center part and the plane stress analysis for the surface part. The calculated results were compared with the experimental ones. A satisfactory agreement has been achieved. Further, the influence of the change of the ligament length on the crack growth resistance curve was investigated. It is shown

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