An analysis of crack propagation velocity in delayed failure under repeating load using an internal friction model
✍ Scribed by Keijiro Nakasa; Hideo Takei; Hisashi Itoh
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 665 KB
- Volume
- 11
- Category
- Article
- ISSN
- 0013-7944
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✦ Synopsis
~--Frequency and temperature dependency of crack propagation velocity in delayed failure under superposed t~..ating load was analyzed using an internal friction model which assumes the interaction between hydrogen atoms and the cyclic moving of the position with tri-axial tensile stress at crack tip.
The decrease of crack propagation velocity (daMt)s by the superposition of repeating load, the appearance of minimum value in (da[dt)s at a certain frequency re, and the shift of .to by the change of temperature, are well explained by the internal friction model. Another reason for the decrease of (da/dt)s by the superposition of repeating load appears to be the decrease of effective stress intensity at crack tip, though this cannot explain the appearance of minimum value of (da/dt)s.