ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 7

Determination of the Fracture-Energy Criterion J_Ic of Two Steels by Static and Dynamic Testing

Nguyen-Duy, P
Scientist and junior scientistmember of ASTM, Materials Science Directorate, Institute de Recherche de l'Hydro-Quebec, Varennes, Quebec

Phélippeau, G
Scientist and junior scientistmember of ASTM, Materials Science Directorate, Institute de Recherche de l'Hydro-Quebec, Varennes, Quebec

Abstract

The fracture energy criterion J_Ic was determined on two carbon-manganese steels, SA-516-70 and SA-105-B, from a single specimen. A graphic method is proposed for verifying the validity of measured values of J_Ic. Static J_Ic and dynamic J_IcD experiments on precracked Charpy V-notch specimens at ambient temperature enabled the observation of the effect of loading rate on the value of J_Ic. For these two steels, the effect of side grooves was detected only in dynamic testing. For SA-516-70 steel, J_IcD > J_Ic, while J_IcD > J_Ic for SA-105-B steel, because of transition temperature fracture behavior. For SA-516-70, static testing was performed on three-point bend specimens of different dimensions to determine the effect of geometrical parameters on the value of J_Ic. A ligament 1-cm long is the lower limit for the determination of J_Ic.

Keywords:
fractures (materials), fracture properties, steels, impact, three-point bending, J-integral

Paper ID: JTE11506J
DOI: 10.1520/JTE11506J
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