Mechanical Contact Mechanics of Water Lubrication Rubber Stave Bearing and Cu Backing for Ship Stern Tube

doi:10.3969/j.issn.1000-1093.2015.12.022

Abstract

Abstract: The theoretical solutions for normal contact load, real contact area, real elastic contact area, real plastic contact area and rubber plasticity index in the contact of rubber stave bearing and Cu backing are constructed by considering the elastic and plastic deformation zones of microcontacts based on statistical analysis of wiggly and jagged surface micro geometric morphology. The calculation and analytical results show that the expected number of contacts increases with the increase in normal contact load and increases slightly with the increase in apparent contact area. The separation between rubber stave bearing and Cu backing decreases with the increase in normal contact load, and gains with the increment of apparent contact area for a given normal contact load. For a given apparent contact area, the real contact area is almost exactly proportional to normal contact load but doesn’t depend on apparent contact area. The average real contact pressure is aggrandized with the augment of normal contact load and lessens with the increase in apparent contact area. The contact resistance between contact surfaces diminishes as the normal contact load increases. When the rubber plasticity index is less than 1.77 or metal plasticity index is less than 0.6, the elastic deformation is caused on contact surfaces. When the rubber plasticity index exceeds 2.95 or the metal plasticity index is larger than 1.0, the plastic deformation occurs on contact surface. The related model and simulation curves lay a theoretical foundation for the accurate solution of elastic and plastic contact about rubber harsh surface.

Key words: ordnance science and technology, ship stern tube, rubber stave bearing, copper backing, contact mechanics, real contact area, normal contact load, rubber plasticity index

CLC Number:

TH113.1

TIAN Hong-liang， ZHENG Jin-hua， QIN Hong-ling. Mechanical Contact Mechanics of Water Lubrication Rubber Stave Bearing and Cu Backing for Ship Stern Tube[J]. Acta Armamentarii, 2015, 36(12): 2369-2380.

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