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My understanding of the stresses acting on this part are:

- Compressive stress on the load shoulder

- Shear stress acting across at roughly a 45° angle (assuming this angle and not a straight line across)

- Stress concentration on the corner (blend rad to be added)

Both these stresses at present are below the material yield (quick bonus question: I'm assuming that the shear stress for aluminium is 60% of the yield - is this a correct assumption?). I'm thinking I can't just leave it here and that I should be working out principal stresses and max shear stresses etc. Can anyone provide guidance on this? Is this required? What should I be looking for (Mohr's circle to calculate P1/P2/shear max, Rankine's theory, von Mises etc.).

http://pasteboard.co/HFxzoE3mw.jpg

http://pasteboard.co/HFxzoE3mw.jpg