Finite Element Analysis of Stress Concentration at the Root of Screw Thread of High Strength Bolt

The influence of the radius of rounded corner at the root of thread,depth of thread and thread pitch on the stress con-centration at the root of screw thread was investigateal for the high strength bolt by means of finite element analysis.The results showed that the concentrated stress is obviously reduced as the radius of rounded corner at the root of thread and the depth of thread increase,while the effect of thread pitch is unconspicuous.