BS ISO 4386-2:2019 pdf free.Plain bearings一Metallic multilayer plain bearings.
Tin casting alloys for multilayer plain bearings are specified in ISO 4381. For selection of the type of specimen in the case of journal bearings, the inner diameter, d1, of the bearing has to be considered. Specimen T 100 is valid from the minimum diameter d1 = 90 mm up to d1 = 200 mm. Specimen T 200 is valid for all diameters d1 > 200 mm. For the thrust bearing specimens, T 100 and T 200 may be used. Whenever possible, T 200 should be preferred. Both bearing metal faces shall be machined as a precondition for fixing the bearing metal layer on the test apparatus to avoid bending deformation of the bearing metal during test procedure. Use test apparatus in accordance with Table 1. Specimens shall be manufactured in accordance with Table 2, Figure 2 and 5.1.The apparatus, as shown in Figure 1, is mounted on the calibrated tensile testing machine. Subsequently, the specimen is locked into the apparatus, whereas the bearing metal surfaces are fixed to avoid local bending. For that purpose, hand tighten the nut (see Figure 1).  The force is steadily increased until the specimen fractures. The increase in stress should be at about 10 N/mm2 per second. The force of the specimen fracture is read from the testing machine.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.BS ISO 4386-2 pdf download.