To investigate the effect of serrations in an interfacial crack between dissimilar
materials, we introduce into the Finite Element (FE) framework a unit cell (UC) at
microscale. By assigning material-specific properties to these unit cells, we can model
various serration profiles and distributions and calculate their effect on the
mixed-mode stress intensity factor (SIF), including its magnitude and phase
angle. The simulation demonstrates that serration profoundly changes the
local behavior of an interfacial crack. The serrations decrease the SIF in
mode I, increase it in mode II, and, when the serration’s height-to-width
ratio increases, the mode mixity SIF increases as well. We find that sparse
serration confines variation in the SIFs to the local peaks and that dense
serrations cause widespread undulations in the SIF’s magnitude and phase
angle.
Mechanical and Aerospace
Engineering
School of Engineering
Rutgers, The State University of New Jersey
98 Brett Road
Piscataway, NJ 08854-8058
United States
Mechanical and Aerospace
Engineering
School of Engineering
Rutgers, The State University of New Jersey
98 Brett Road
Piscataway, NJ 08854-8058
United States