Compare the stress concentration factor for a single small h

Compare the stress concentration factor for a single small hole with that for two small holes spaced a distance b = 2a.

Solution

stress concentration factor for a single hole would produce a rather more than two holes as the stress concentration factor is the ratio of maximum stress to the stress appliead or nominal stress.

In case of single hole the maximum stress would be more than the double hole as it would not change much until it reaches the second hole.

Mathematically, the stress concentration factor for hole (K_t) = (1+2a/b)

for single hole, a=b and for double hole b=2a

K_t for single hole is 3 while that for double hole would be 2