Osama A. Terfas
The Effect of Stress Biaxiality on Crack Shape Development
1829 - 1834
2012
6
9
International Journal of Mechanical and Mechatronics Engineering
https://publications.waset.org/pdf/1996
https://publications.waset.org/vol/69
World Academy of Science, Engineering and Technology
The development of shape and size of a crack in a
pressure vessel under uniaxial and biaxial loadings is important in
fitnessforservice evaluations such as leakbeforebreak. In this
work finite element modelling was used to evaluate the mean stress
and the Jintegral around a front of a surfacebreaking crack. A
procedure on the basis of ductile tearing resistance curves of high and
low constrained fracture mechanics geometries was developed to
estimate the amount of ductile crack extension for surfacebreaking
cracks and to show the evolution of the initial crack shape. The
results showed nonuniform constraint levels and crack driving forces
around the crack front at large deformation levels. It was also shown
that initially semielliptical surface cracks under biaxial load
developed higher constraint levels around the crack front than in
uniaxial tension. However similar crack shapes were observed with
more extensions associated with cracks under biaxial loading.
Open Science Index 69, 2012