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Crack Growth Testing Beach Marks

Dear Fellow Machanicians,

I want to make some beach marks in fatigue cracks – what are the best loads?

To verify crack growth modelling we have put some notches in square (10×10mm) section steel tensile fatigue specimens – so there's a reasonably controlled initiation – at least location.  In some the notch is across one side in others it's just on one corner, 0.5mm deep. I have tried one and didn't get the obvious beach marks I was hoping for.

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