Journal of Theoretical
and Applied Mechanics

55, 2, pp. 659-666, Warsaw 2017
DOI: 10.15632/jtam-pl.55.2.659

Numerically predicted J-integral as a measure of crack driving force for steels 1.7147 and 1.4762

Goran Vukelic, Josip Brnic
Fracture behavior of two types of steel (1.4762 and 1.7147) is compared based on their
numerically obtained J-integral values. The J-integral are chosen to quantify the crack
driving force using the finite element (FE) stress analysis applied to single-edge notched
bend (SENB) and compact tensile (CT) type fracture specimens. The resulting J-values are
plotted for growing crack length (a – crack length extension) at different a/W ratios (a/W
– relative crack length; 0.25, 0.5, 0.75). Slightly higher resulting values of the J-integral for
1.4762 than 1.7147 can be noticed. Also, higher a/W ratios correspond to lower J-integral
values of the materials and vice versa. J-integral values obtained by using the FE model of
the CT specimen give somewhat conservative results when compared with those obtained
by the FE model of the SENB specimen.
Keywords: crack, steel 1.7147, steel 1.4762, FE analysis