Abstract
Hydride-induced embrittlement is one type of material deterioration caused by hydrogen in metals such as zirconium, titanium, magnesium, niobium and vanadium. According to in-situ electron microscopy studies, embrittlement may occur by the precipitation of brittle hydrides at stress concentration locations. The fracture of the hydrides could lead to delayed hydride cracking, which is a sub-critical crack growth mechanism operating by the repetition of hydride precipitation and fracture near the crack tip. In the present work, steady-state sub-critical crack growth in α-titanium is investigated. It is confirmed that hydride precipitation has a strong effect on the hydrostatic stress level ahead of the propagating crack and leads to significant deviations from the well-known near-tip stress distributions in elastic-plastic materials. The threshold stress intensity factor for sustained load cracking is predicted by considering the distribution of the hoop stress on the crack plane. The extent of the hydride-rich zone near the crack tip is also calculated and used for the estimation of the velocity of the crack within stage-II regime. Thus a simplified diagram of crack velocity vs. applied stress intensity factor is constructed.
| Original language | English |
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| Publication status | Published - 1 Dec 2004 |
| Externally published | Yes |
| Event | European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS 2004 - Jyvaskyla, Finland Duration: 24 Jul 2004 → 28 Jul 2004 |
Conference
| Conference | European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS 2004 |
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| Country/Territory | Finland |
| City | Jyvaskyla |
| Period | 24/07/04 → 28/07/04 |
Keywords
- Crack growth
- Delayed hydride cracking
- Hydride
- Hydrogen
- Titanium