FRACTURE BEHA VIOUR CLOSE TO CRACK INITIATION IN PRESENCE OF RESIDUAL STRESS FIELDS

M. Pereira  H. Wohlfahrt  M. Schaper      

Anales de la Mecánica de la Fractura, nº 12 . 1995 . Pág. 97 -102
Ver (.pdf): Anales12-014

Resumen: The purpose of this work is to investigate fracture resistance close to crack inítíation in a high strength structural steel in the presence of residual stresses. Residual stress fields were produced in the fatigue precrack region and measured on the surface of the specimens using X-ray diffraction as well as in the crack tip using the hole-drilling method. The specimens were tested at a temperature within the ductile-brittle transition region of the materiaL The fracture resistance was then evaluated on the basis of the Crack Tip Opening Displacement (CTOD) and J-integral. It was possible to determine qualitatively the influence of the residual stresses on the fracture resistance behaviour. Tensile residual stresses acting in the loading direction result in a decrease of the fracture resistance of the specimens.

LocalizaciónA Coruña

Catholic University of Rio de Janeiro (PUC-Rio) and CEFET 'CSF' - RJ. Department of Materíals Science and Metallurgy. P.O. Box 38008, Rio de Janeiro, RJ, CEP 22453-900, Brazil
Technícal University of Braunschweig (TU Braunschweig). Institute of Welding Technology Langer Karnp 8, 38106 Braunschweig, Germany
Technícal Uníversity of Dresden (TU Dresden). Institute of Materials Science. Helmholtzstr. 7, 01062 Dresden, Germany