Elastoplastic Fractal Model for Normal Contact Damping Energy Dissipation of Joint Surface
When modeling the normal contact damping energy dissipation in the joint surface,it is incom-plete to consider only the energy storage during elastic deformation and the energy dissipation during plastic deformation of the asperity,because there is an elastic-plastic deformation case of the asperity.By introdu-cing the asperity loading and unloading model,the energy storage and dissipation of the asperity in elasto-plastic deformation are separated,and a more realistic model of the normal contact damping energy dissipa-tion and its loss factor is established.The model simulation results show that the normal contact damping energy dissipation and its loss factor increase with the increase of fractal roughness parameter.With the in-crease of fractal dimension,the energy dissipation and loss factor of the normal contact damping first de-crease and then increase,and the minimum value appears near 1.2.The energy dissipation of the normal contact damping of the joint surface increases with the increase of the normal contact load.The loss factor decreases with the increase of the normal contact load.The normal damping energy consumption consider-ing the elastic-plastic deformation mechanism is lower than the normal damping energy consumption con-sidering only the elastic and plastic deformation mechanisms.
fractal theoryjoint surfaceelastoplasticenergy dissipationdamping loss factor