Assume: neglect of the collar dimensions.
Δ_h=(P*r)/t=(5*125)/8=78.125 MPa ,Δ_a=Δ_h/2=39 MPa
Δβ=(S*Q)/(I*b)=(40*Δβ¬β10Δβ¬β^3*Δβ¬(Δβ¬β0.125Δβ¬β^2-Δβ¬β0.117Δβ¬β^2 )*121*Δβ¬β10Δβ¬β^(-3))/(Δβ¬/2 (Δβ¬β0.125Δβ¬β^4-Δβ¬β0.117Δβ¬β^4 )*8*Δβ¬β10Δβ¬β^(-3) )=41.277 MPa
@ Point K:
Δ_z=(+M*c)/I=(40*0.6*121*Δβ¬β10Δβ¬β^(-3))/(8.914*Δβ¬β10Δβ¬β^(-5) )=32.6 MPa
Using Mohr Circle:
Δ_max=(Δ_h+Δ_a)/2+Γ’Ε‘(Δβ^2+((Δ_h-Δ_a)/2)^2 )
Δ_max=104.2 MPa, Δβ_max=45.62 MPa