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Fig. C-6. Compact Tension Fracture Toughness Test Specimen

Mode I Opening Mode

Mode II Shearing Mode

Mode III Tearing Mode

Mode I Opening Mode

Mode II Shearing Mode

Mode III Tearing Mode

Fig. C-7. Crack Opening Displacement Modes

The value of the stress intensity factor K in which the crack propagates to failure is called the critical stress intensity factor Kc. If the specimen provides sufficient plastic constraint at the crack tip, a plane-strain condition is produced which gives the lowest value Kc of the material. When these conditions are met during the fracture toughness test, then Kc is equal to the KIc, the plane-strain

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