Using Direct Current Potential Drop Technique to Estimate Fatigue Crack Growth Rates in Solid Bar Specimens under Environmental Assisted Fatigue in Simulated Pressurized Water Reactor Conditions
نویسندگان
چکیده
The direct current potential drop (DCPD) technique may be used in crack propagation tests to measure the growth rate (CGR). Potential probes attached specimen allow variation of length estimated. In this research, DCPD using one single probe was applied solid bar specimens (i.e., without any initial notch or crack) subjected low-cycle fatigue testing a simulated pressurized water reactor (PWR) environment. This particular analysis had two associated difficulties, first being fact that initiation sites are not known beforehand, and second consisting experimental difficulties conditioning factors with simulation PWR Nine were tested failure under different strain amplitudes frequencies, while also measuring corresponding signal during process. It observed multiple cracks detected by measurements. Moreover, as continued, became dominant progressed cause failure. allowed average CGR Finally, obtained CGRs validated comparing them derived from striation spacing measurements, scanning electron microscopy (SEM) literature values gathered NUREG/CR-6909 document.
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ژورنال
عنوان ژورنال: Metals
سال: 2022
ISSN: ['2075-4701']
DOI: https://doi.org/10.3390/met12122091