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Looking at the failure it looks as if the angle of the brittle fracture is about 58 degrees to the tensile axis of the stud.
Coincidentally this is about the correct angle for the Critical Resolved Shear Stress of a Face Centred Cubic material - (Austenitic steels such as Dilavar).
That's not to say that a surface defect didn't initiate the failure but the crack would then be likely to propogate at this angle.
When Dilavar studs fail with a flat fracture perpendicular the the tensile axis of the stud the failure is likely to be caused by a different mechanism.
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