Price et al. investigated the role of notches in the hydrogen-assisted cracking of PRESTRESSING STEELS (1992). The investigators indicate that hydrogen may enter the tendons as a result of cathodic protection or the acidification of the solution within corroding pits. Smooth, unnotched specimens are considered to be more representative of service conditions than notched or precracked specimens. Notches present at the prestressing wedges were not considered. The investigators indicate that when pitting corrosion does occur, it spreads along the wire and results in FLAT-BOTTOMED CORROSION DAMAGE as was found in previous research. This particular investigation included the effect of two notch configurations on hydrogen cracking. The first was a FLAT-BOTTOMED NOTCH 1/2 in. (10 mm) long and 0.04 in. (1 mm) deep with rounded corners. The second was Charpy V-notch. The specimens were charged with hydrogen and slow strain rate tests were conducted, after which fractographic analyses were conducted to determine the nature of the fracture. The flat-bottomed specimens fractured by ductile shear. The percentage reduction in cross-sectional area, however, indicated a brittle failure, while the elongation was reduced significantly over that of the uncharged specimens. It was concluded that the reduction in ductility in the FLAT-BOTTOMED NOTCHES is due to HE.
http://www.bpesol.com/bachphuong/media/images/book/2222r_01....

In your case you seem to have unintentional "flaws" or "damage" rather than deliberate notching.

The effect of pre-stress cycles on fatigue crack growth - An analysis of crack ... and flat bottomed cracks for flaw depth to thickness ratios of 0.25, ...
ntrs.nasa.gov/search.jsp?Ns=ArchiveName%7C1&N...