One Method for Estimating Normal Contact Stiffness with Ra and Adhesion Rate
Based on the fractal contact theory, the model about the relation between normal contact stiffness and material properties as well as fractal parameters is established. Then by making use of the relation between fractal parameters and surface roughness, a new method for estimating the normal contact stiffness is put forward. The numerical results indicate that the contact stiffness increases as surface roughness decreases or adhesion rate increases. When the adhesion rate is constant, contact stiffness changes a little whileRa≥6.3μm, but the change is relatively bigger whenRa≤6.3μm. Considering both the cost of surface machining and the influence of contact stiffness on the whole system, the surface roughness is suggested to beRa=6.3μm. The results provide theoretical supports for vibration isolation analysis with gaskets and the process of low-noise construction.