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Fracture toughness can be characterised by the critical stress intensity factor K(Ic). For ceramics, its determination according to ASTM : E 399-72, regardless of cost, is very complex. The utilisation of specimen geometries which permit stable crack growth have become popular. Good examples are the tests using Chevron notch specimens, which also allow the determination of da/dt versus K(I) curves.

Additional information

Authors: SARAIVA MARTINS C, JRC Petten (NL);GUERRA ROSA L, Instituto Superior Técnico, Lisboa (PT)
Bibliographic Reference: Paper presented: 4as Jornadas de Fractura, Lisboa (PT), Oct. 1991
Availability: Available from (1) as Paper PT 36500 ORA
Record Number: 199111604 / Last updated on: 1994-12-02
Original language: pt
Available languages: pt