The effect of bolt length in the fatigue strength of M24×3 bolt studs

摘要

In this study we evaluated the effect of bolt length on the fatigue behavior of joints with bolt studs used in the flange/housing assembly of a gas compressor for polyethylene poly-merization. The bolt stud used is the M24x3 class 8.8. Two different bolt lengths were eval-uated.A slim spread sleeve was used in the case of the longer bolts. The torque control was used to achieve the tightening preload. However, the preload and cyclic strains were mon- itored. The fatigue strength increases with increasing bolt stud length, even with the use of the slim spread sleeve. The study showed a difference between the theoretical and the experimental load factor for the case of short joints.