ISO INTERNATIONAL STANDARD 6281 Second edition 2020-02 Plain bearingsTesting under conditions of hydrodynamic and mixed lubrication in test rigs Paliers lisses-Essai des paliers lisses dans les conditions de fubrification hydrodynamique et mixte dans des machines d'essai pour paliers Refercnccnumber IS06281:2020(E) @IS02020 IS06281:2020(E) COPYRIGHTPROTECTEDDOCUMENT ISO2020 All rights rescrvcd. Unless otherwise spccified, or required in tlie context of its implemcntation, no part of this publication may beloworIso'smemberbodyinthecounlryoltherequester ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122749 0111 Fax: +41 22749 09 47 kmail:[email protected] Website: www.iso.org Published in Switzcrland ii @ IS0 2020 -All rights reserved IS06281:2020(E) Contents Page Foreword V 1 Scope. 1 2 Normative references 1 Terms and definition 1 4 Symbols 1 5 Test objectives for bearing properties .2 6 Test rigs. .3 6.1 Generalrecommendations. 3 6.2 Generic types of test rig 4 7 Test procedures 6 7.1 General. 6 7.2 Running-in ability 6 7.3 Wear resistance 7 7.4 Compatibility betwcen bcaring and journal matcrial (rcsistance to adhesion) 7 7.5 Embeddability (foreignparticles absorption). 7 7.6 Resistance to journal scoring and abrasion. 7 7.7 Conformability 7 7.8 Deformability (compressivestrength) 7.9 Resistance to crosion (cavitation crosion, fluid crosion, particle crosion) 7 7.10 Staticload carrying capacity 8 7.11 Dynamic load carrying capacity (fatigue strength) 8 7.12 Friction characteristics .8 7.13 Lubricant flow rate characteristics .8 7.14 Tempcraturc incrcasc characteristics 8 8 Testing and test report 8 8.1 General 8 8.2 Test rig. 9 8.3 Measuring equipment. .9 8.3.1 General. 9 8.3.2 Measuring equipmentfor independent variables (which can also be time- dependent) 9 8.3.3 Measuring equipment for dependent variables (which can also be time- 9 dependent). 8.4 Test bearing and journal 10 8.4.1 General. 10 8.4.2 Test bearing. 10 8.4.3 Journal. 11 8.5 Lubricant and lubricant supply method 11 8.5.1 Lubricant 11 8.5.2 Lubricant supply method 12 8.6 Operating conditions (test conditions) 12 8.6.1 12 General. 8.6.2 Bearing load 12 8.6.3 Sliding velocity 12 8.6.4 Lubricantsupply condition 12 8.6.5 Ambient conditions. 13 8.7 Test results. 13 8.7.1 General 13 8.7.2 13 Hydrodynamicparameters (includingestimated results) 8.7.3 Assessmentofbearingperformance 14 8.8 Discussion of test results and remarks. 14 @1So 2020-All rights reserved iii