I would like to know if we can determine the fracture toughness properly by performing a fatigue test (high cyclic loading on a Compact Tension specimen, with crack growing?)
dear sir, please read
1.https://www.theseus.fi/bitstream/handle/10024/59698/ABASS_ADEYINKA
2. https://ntrs.nasa.gov/api/citations/19750010553/downloads/19750010553.pdf
3.https://onlinepubs.trb.org/Onlinepubs/trr/1978/695/695-003.pdf
4. applsci-11-00259-v3.pdf
Hi Xinyuan,
You probably know that the fatigue properties of a material are measured during a test in which the load is cycled and the fracture toughness of a material is measured during a test when the load is monotonically increasing. Therefore it is not generally possible to measure toughness during a fatigue test.
You also may know that a toughness test is generally performed on a specimen which has a "hairline" pre-fatigue crack. That is, the crack tip has been generated by fatigue so that it is sharp. A sharp crack tip is likely to give lower/conservative levels of toughness (e.g. see figure 1 here: https://www.twi-global.com/technical-knowledge/published-papers/the-effect-of-notch-sharpness-on-the-fracture-toughness-determined-from-sent-specimens).
The following article might be useful.
https://www.twi-global.com/technical-knowledge/faqs/faq-what-is-a-fracture-toughness-test
Regards,
Simon
Please go through ASTM E1820 - 20b Standard Test Method for Measurement of Fracture Toughness.
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