ISO 4386-2:2019 pdf free

ISO 4386-2:2019 pdf free.Plain bearings – Metallic multilayer plain bearings
This document specifies a tensile test method for determination of the bond strength between the bearing metal and the backing. The test can be applied to multilayer plain bearings with bearing metals based on lead, tin, copper or aluminium. For tested layer thicknesses 2 2 mm, a raw lining thickness of a minimum additional 1 mm is necessary.
The backings are from steel, cast steel or copper alloys. The bond strength test does not apply to bearings with cast iron backing.
The test applies to all thrust bearings and to journal bearings with an inner diameter of backing 290 mm.
The test can be used for comparative investigations into the influence on the bond strength of various processes and types of material. In addition, the test is suitable for production control and for process qualification of bearing production.
For non-destructive ultrasonic testing of the bond between bearing metal and backing for bearing metal layer thicknesses 2 2 mm, see ISO 4386-1.
With the aid of the force of failure, Fmax, found necessary to tear the bearing metal away from the backing in the region of the bond surface, the bond strength, Rch, is to be determined according to Formula (1). Previous existing local bond defects on the surface of failure shall be noted.
The characteristic limiting value of layer thickness for the absolute bond strength is a property of the bearing metal. It is 6 mm for Pb and Sn alloys. For other than Pb and Sn alloys, the value shall be determined in a series of tests with different thicknesses of the bearing material layers. Above the limit,the results are independent of the layer thickness.
Absolute bond strength is given when the layer thickness is greater than or equal to the characteristic limiting value of thickness. The result is independent of the layer thickness of the bearing metal.Relative bond strength is given when the layer thickness is less than the characteristic limiting value of thickness. For layer thicknesses below the limiting value of thickness, it has been established experimentally that the relative bond strength drops linearly to the value zero (see Figure 6).ISO 4386-2 pdf free download.