Local strain energy density to predict mixed mode IÂ +Â II fracture in specimens made of functionally graded materials weakened by V-notches with end holes

In theoretical section, a criterion based on the averaged value of strain energy density over a well-defined control volume was proposed to predict the fracture loads of VO-notched FGM specimens under mixed mode I + II. In addition, the effect of notch geometrical parameters (notch tip radius, notch depth, and notch opening angle) on fracture load was studied. This study demonstrates that SED works well on VO-notched FGM specimens under mixed mode I + II loading.