Fracture Toughness of Whisker Reinforced Ceramics

Abstract:

By use of a probabilistic fracture model, a numerical simulation method for deformation and fracture behavior of whisker reinforced ceramics is developed first. A crack in whisker reinforced ceramics is regarded as the crack with a cohesive stress acting on the crack surface, and then the tension-softening relation is derived on the basis of a micromechanical study. After the numerical simulation method is constructed by incorporating the tension-softening relation in an FEM scheme, we simulate the load-load point displacement relationship for an edge-cracked bend specimen of a SiC whisker/alumina composite. The fracture toughness determined from the simulated maximum load is consistent with that obtained from experiment.

• Periodical: Key Engineering Materials (Volume 430)
• Pages: 41-46
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.430.41
• Online since: March 2010
• Authors: Makoto Katagiri, Akihiko Kumaki, Yoshito Izumi, H. Suzuki, Hideki Sekine
• Keywords: Fracture Toughness, Numerical Simulation Method, Probabilistic Fracture Model, SiC Whisker/Alumina Composite, Tension-Softening Relation, Whisker Reinforced Ceramics

References

[1] P. F. Becher, C. H. Hsueh, P. Angelini and T. N. Tiges: J. Am. Ceram. Soc. Vol. 71 (1988), p.1050.

[2] S. V. Nair: J. Am. Ceram. Soc. Vol. 73 (1990), p.2839.

[3] A. E. Giannakopoulos and K. Breder: J. Am. Ceram. Soc. Vol. 74 (1991), p.194.

[4] L. K. Jain and R. C. Wetherhold: Acta Metall. Mater. Vol. 40 (1992), p.1135.

[5] H. Sekine and H. Suzuki: Int. Conf. Mater. Engng. Resou., '91 Akita, (1991), p.242.

[6] H. Sekine and H. Suzuki: JSME Int. J., Ser. I Vol. 34 (1991), p.228.