Hertz contact in mechanical seal applications-

Hertz contact in mechanical seal applications

　2017-03-13　　

Hertz contact in mechanical seal applications

Object contact, contact stress and contact deformation are the problems that various mechanical seal parts will encounter when working. Hertz first solved the contact problem of the mechanical seal on the curved surface, and his theory was widely used.

The radius of the ball is R1, R2, and the planting load is W. The sphere deforms locally to form a circular contact area of u200bu200bradius a. From the Hertz formula of elastic mechanics, the elastic contact radius a, the symbol A of the contact surface of the two spheres, and the approaching amount of the two spheres can be obtained.

Hertz theory is used to solve elastic contact problems. When the load increases, the deformation of the object increases, changing from an elastic state to a plastic state, and there is no longer a linear relationship between stress and deformation. The normal load per unit actual contact area is called the actual specific pressure. It is close to the hardness of the material in plastic contact, and far lower than the hardness of the material in elastic contact. The concept of plasticity index can be used to determine whether a pair of contact objects are in elastic contact or in plastic contact.　　346.html,

The asperity model in the application of mechanical seal 　　 The influence of plasticity index in the application of mechanical seal