STARTER CRACKS FOR FRACTURE TOUGHNESS TESTING BY A RESONANCE FATIGUE TECHNIQUE.
Final memo rept.,
NAVAL RESEARCH LAB WASHINGTON DC
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A technique was developed for introducing fatigue cracks of a predetermined size automatically in specimens using a reverse bending resonance machine. The drop in the resonant frequency of vibration reflects the growth of cracks and it is by means of the change in frequency that the size of cracks is controlled. This technique has applicability in mechanical testing in which are required specimens containing pre-existing flaws or cracks, such as fracture toughness testing, and in studies of crack propagation. Author
- Metallurgy and Metallography
- Test Facilities, Equipment and Methods