The reason, imo, simulation does not give you the stress is because different codes specify different ways of calculating bolt stresses. The more important thing to find out is the axial and shear loads. The bolt calculations within solidworks arent tied to any particular code, so you are suppossed to calculate the stresses. We follow VDI 2230.
1. From the axial load and find out the max tensile stress based on teh root dia of the bolt. Let's call it T
2. Then find the max torsional stress, again based on the root dia. You will have to use approriate coeffcients based on the grade you are using and thread friction. Lets call it S
3. Von Mises stress = sqrt ( (T^2)+3*((k*S)^2)), k is usually 0.50
Please look up VDI 2230 for procedure.
Hope thsi helps.