Influence of Lubrication Systems on the Fatigue Strength of Bolted Joints

The fatigue behavior of bolted joints is critical to failure for many applications due the high notch effect. Among other parameters, lifetime based on influence surface system, consisting corrosion protection and lubricant. With intention considering system in design dimensioning process joints, experimental investigations are carried out systematically an exemplary selected basecoat various lubricant systems. basis given by tests supported methods material analysis fractographic evaluation. A reproducible method determine crack initiation as well propagation developed used evaluation Defined damage can be reproducibly assigned a frequency change rate resonance test machine. durability friction load-bearing contact (e.g., greases) reduces stress delays initiation. Lubricants which able creep oil) slow down increase lifetime, proved higher number cycles increased strength.