Zgadzam się
Nasza strona zapisuje niewielkie pliki tekstowe, nazywane ciasteczkami (ang. cookies) na Twoim urządzeniu w celu lepszego dostosowania treści oraz dla celów statystycznych. Możesz wyłączyć możliwość ich zapisu, zmieniając ustawienia Twojej przeglądarki. Korzystanie z naszej strony bez zmiany ustawień oznacza zgodę na przechowywanie cookies w Twoim urządzeniu.
The paper presents the results of numerical simulation of brittle material fracture initiated by
Griffith's crack situated at any angle with respect to the load direction. The simulations were performed
with the Simulia Abaqus FEA system using the X-FEM method. The direction of the crack propagation
was determined using the user's subroutine written in Fortran, implemented in the Abaqus system. The
authors programmed several conditions for the direction of the fracture propagation: maximum principal
stress criterion, Ottosen-Podgórski criterion, three criteria based on displacements around the crack tip,
and the MTS criterion, which is based on stress intensity factors. For the purposes of this study, two
shapes of the crack tip were analyzed - sharp and blunted. The relationship between the direction of the
initial fracture and the direction of crack propagation was found. The simulations were carried out for the
angles of the initial crack from 0° to 90°, every 10°. A theoretical analysis of the implemented criteria was
also carried out and compared to numerical results. The influence of the shape of the crack tip on the
simulation result was analyzed. It was shown that the simulation results closest to the theoretical results
were obtained for the own implementation of the stress-based criteria. It has also been proven that the
shape of the crack tip has little effect on the result if the finite element mesh is properly densified.
However, the sharp crack has a disadvantage for small initial crack angles. The Author’s method of
predicting the crack propagation has been proven correct and effective. This work is also the basis for the
further development of the described method.
