On the Crack Tip Shielding in Particle Reinforced Composites

摘要

The paper is focused on crack-tip shielding effects caused by crack deflection (tilting) processes in particle reinforced composites. A numerical analysis by means of the ANSYS code was employed in order to assess these effects caused by rigid particles and holes in the matrix As the 2 step the effective stress intensity factor K_(eff) was calculated for many crack tip positions in front and in between, wo particles of the same kind. In spite of a significant crack tip tilting, the spherical holes induce a slight increase in the K_(eff) factor (anti-shielding). On the other hand, therigid particles cause a significant decrease in the K_(eff) value (shielding), while leaving the crack practically unaffected n the second step, the effect of particles in the wake of the crack trp will be analyzed in order to obtain a complex picture of shielding.