Accession Number : ADA140513

Title :   Rubber to Backing Bond Strength for Stave Bearings.

Descriptive Note : Research and development rept.,


Personal Author(s) : Daugherty,T L

PDF Url : ADA140513

Report Date : Apr 1984

Pagination or Media Count : 53

Abstract : Rubber-surfaced stave bearings in most U.S. Navy ships support the propulsion shafting and propeller aft of the main shaft seal. Problems have been encountered with inadequate bonding of the rubber surface to their brass backing and with corrosion of the brass backing. The objective of this work was twofold: to develop improved specification criteria that would ensure reliable bonding between the rubber surface and the backing, and to evaluate the bond strength of alternative backing materials that eliminate corrosion. The results probably reflect properties of the rubber used because most specimens of the plastic-backed design failed by tearing within the rubber rather than by adhesion at the interface. The rubber surface is softer than that specified for the Class I stave bearing. Despite the strength reductions observed after being subjected to the environmental conditions, the plastic-backed staves met the present specification limits. Both hard rubber and plastic appear to be adequate materials to meet the adhesive bond strength requirements of the specification. Recommended changes to the military specification with rationale for each change are proferred for both brass-backed and nonmetal-backed bearing staves.

Descriptors :   *Adhesive bonding, Rubber, Bearings, Brass, Strength(Mechanics), Bonded joints, Failure(Mechanics), Sea water corrosion, Stern tubes(Propulsion), Struts, Shafts(Machine elements), Naval vessels, Thermal properties, Adhesion, Reliability, Interfaces, Defects(Materials), Manufacturing, Quality control, Microstructure, Computations, Equations, Hypotheses

Subject Categories : Properties of Metals and Alloys
      Fabrication Metallurgy
      Elastomers and Rubber
      Pumps, Filters, Pipes, Tubing, Fittings & Vlvs

Distribution Statement : APPROVED FOR PUBLIC RELEASE