ISO 6281:2020
Plain bearings — Testing under conditions of hydrodynamic and mixed lubrication in test rigs
This document defines requirements for the testing of lubricated plain journal bearings in test rigs, running under conditions of hydrodynamic or mixed lubrication, during bearing and/or material development. It deals with both static and dynamic loading in solid and multi-layer journal bearings. It is not applicable to the testing of dynamic characteristics of lubricant film in journal bearings applied in calculation of vibration and stability of turbo-rotors.
NOTE It is intended that further details of test procedures be established when carrying out testing based on this document.
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Foreword
1 Scope
2 Normative references
3 Terms and definition
4 Symbols
5 Test objectives for bearing properties
6 Test rigs
6.1 General recommendations
6.2 Generic types of test rig
7 Test procedures
7.1 General
7.2 Running-in ability
7.3 Wear resistance
7.4 Compatibility between bearing and journal material (resistance to adhesion)
7.5 Embeddability (foreign particles absorption)
7.6 Resistance to journal scoring and abrasion
7.7 Conformability
7.8 Deformability (compressive strength)
7.9 Resistance to erosion (cavitation erosion, fluid erosion, particle erosion)
7.10 Static load carrying capacity
7.11 Dynamic load carrying capacity (fatigue strength)
7.12 Friction characteristics
7.13 Lubricant flow rate characteristics
7.14 Temperature increase characteristics
8 Testing and test report
8.1 General
8.2 Test rig
8.3 Measuring equipment
8.3.1 General
8.3.2 Measuring equipment for independent variables (which can also be time-dependent)
8.3.3 Measuring equipment for dependent variables (which can also be time-dependent)
8.4 Test bearing and journal
8.4.1 General
8.4.2 Test bearing
8.4.3 Journal
8.5 Lubricant and lubricant supply method
8.5.1 Lubricant
8.5.2 Lubricant supply method
8.6 Operating conditions (test conditions)
8.6.1 General
8.6.2 Bearing load
8.6.3 Sliding velocity
8.6.4 Lubricant supply condition
8.6.5 Ambient conditions
8.7 Test results
8.7.1 General
8.7.2 Hydrodynamic parameters (including estimated results)
8.7.3 Assessment of bearing performance
8.8 Discussion of test results and remarks
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definition
4 Symbols
5 Test objectives for bearing properties
6 Test rigs
6.1 General recommendations
6.2 Generic types of test rig
7 Test procedures
7.1 General
7.2 Running-in ability
7.3 Wear resistance
7.4 Compatibility between bearing and journal material (resistance to adhesion)
7.5 Embeddability (foreign particles absorption)
7.6 Resistance to journal scoring and abrasion
7.7 Conformability
7.8 Deformability (compressive strength)
7.9 Resistance to erosion (cavitation erosion, fluid erosion, particle erosion)
7.10 Static load carrying capacity
7.11 Dynamic load carrying capacity (fatigue strength)
7.12 Friction characteristics
7.13 Lubricant flow rate characteristics
7.14 Temperature increase characteristics
8 Testing and test report
8.1 General
8.2 Test rig
8.3 Measuring equipment
8.3.1 General
8.3.2 Measuring equipment for independent variables (which can also be time-dependent)
8.3.3 Measuring equipment for dependent variables (which can also be time-dependent)
8.4 Test bearing and journal
8.4.1 General
8.4.2 Test bearing
8.4.3 Journal
8.5 Lubricant and lubricant supply method
8.5.1 Lubricant
8.5.2 Lubricant supply method
8.6 Operating conditions (test conditions)
8.6.1 General
8.6.2 Bearing load
8.6.3 Sliding velocity
8.6.4 Lubricant supply condition
8.6.5 Ambient conditions
8.7 Test results
8.7.1 General
8.7.2 Hydrodynamic parameters (including estimated results)
8.7.3 Assessment of bearing performance
8.8 Discussion of test results and remarks
Bibliography