abstract:Dynamical friction is a term in astrophysics related to loss of momentum and kinetic energy of moving bodies through a gravitational interaction with surrounding matter in space. It is sometimes referred to as gravitational drag, and was first discussed in detail by Subrahmanyan Chandrasekhar in 1943.
The originatingmechanism of fatiguedamage of slidingfriction couples is analyzed and that the ultimate causationoffatigue damage is dynamicalstressstate is pointed out.