Abstract
The chevron-notch specimen is especially useful for measuring the plane strain fracture toughness, KIc, of ceramics. During test, a crack initiates at the tip of the chevron notch and extends stably as load is increased. For materials with flat crack growth resistance curves, maximum load for a given specimen configuration will always occur at the same relative crack length independent of the material. KIc is calculated from maximum load and the corresponding (minimum) value of the dimensionless stress intensity factor coefficient (Y m * ), with no need for crack length measurement.
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