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On the Crack Tip Shielding in Particle Reinforced Composites

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Abstract:

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 first step, the effective stress intensity factor Keff was calculated for many crack tip positions in front, and in between, two particles of the same kind. In spite of a significant crack tip tilting, the spherical holes induce a slight increase in the Keff factor (anti-shielding). On the other hand, the rigid particles cause a significant decrease in the Keff-value (shielding), while leaving the crack practically unaffected. In the second step, the effect of particles in the wake of the crack tip will be analyzed in order to obtain a complex picture of shielding.

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Periodical:

Materials Science Forum (Volume 482)

Pages:

311-314

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.482.311

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Online since:

April 2005

Authors:

Jana Horníková, Pavel Šandera, Jaroslav Pokluda

Keywords:

Crack Tip Shielding, Metallic Inclusions, Stress Intensity Factor (SIF), Toughening Effect

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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References

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