Thanks Bernoullies123 & Boilerone, however I have tried the Roark's formula and it gives a result several times greater than FEA. I suspect the problem is that the edges are fixed (i.e. welded) not simply supported
We need to calculate the max stress on a triangular plate used in our assemblies. The plate is an isosceles triangle welded on all 3 edges to fill a gap. It is subjected to 7 bar pressure. Can anyone suggest a suitable calculation to use so we can avoid FEAing it