Robert Paynter's blog
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.