Numerical Investigation of J-Integral on a Notched Pressure Vessel
Finite elements analysis has been performed to compute a J-integral values in a notched pressure vessel. A semi-elliptical notch was introduced in a wall of cylindrical pressure vessel with aspect ratio of notch depth to wall thickness a/w = 1/6 to 5/6, where the wall thickness was 3 mm. Two cases were examined – inner and outer notch. Numerical examinations were revealed that outer notch has much higher values of J-integral (3-4 times), all other being the same, (i.e. inner pressure and dimensions of the notch). That was explained in terms of triaxality stress state in front of notch. Namely, it was shown that inner notch has positive triaxiality stress ratio and vice-versa, outer notch revealed highly negative hydrostatic stress component ahead the notch.
Nicușor Alin Sîrbu and Aurel Valentin Bîrdeanu
S. Tadić et al., "Numerical Investigation of J-Integral on a Notched Pressure Vessel", Advanced Materials Research, Vol. 1146, pp. 152-157, 2018