ASTM D7420-11
(Test Method)Standard Test Method for Determining Tribomechanical Properties of Grease Lubricated Plastic Socket Suspension Joints Using a High-Frequency, Linear-Oscillation (SRV) Test Machine
Standard Test Method for Determining Tribomechanical Properties of Grease Lubricated Plastic Socket Suspension Joints Using a High-Frequency, Linear-Oscillation (SRV) Test Machine
SIGNIFICANCE AND USE
This test method can be used to quickly determine the lubricating ability of greases lubricating automotive plastic socket suspension joints. This test method has found wide application in qualifying greases used in chassis systems. This test method is a material and application oriented approach based on inputs from field experiences for characterizing the tribological behavior (friction and wear) using random, discrete, and constant parameter combinations. Users of this test method should determine whether results correlate with field performance or other applications prior to commercialization.
SCOPE
1.1 This test method covers a procedure for determining the friction and wear behavior of grease lubricated plastic socket suspension joints, for validation of suspension joint greases and quality inspection for those greases under high-frequency linear-oscillation motion using the SRV test machine.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D7420 − 11
Standard Test Method for
Determining Tribomechanical Properties of Grease
Lubricated Plastic Socket Suspension Joints Using a High-
1
Frequency, Linear-Oscillation (SRV) Test Machine
This standard is issued under the fixed designation D7420; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This test method was originally published as bilingual company standard TRW 62 051 301 in June
2
2002.TRWFahrwerksysteme transferredthecopyrightonOct.5,2004tostandardizationbodies.The
DIN 51834 working group has modified this standard by adding precision information based on round
robin tests.
1. Scope* D4175 Terminology Relating to Petroleum, Petroleum
Products, and Lubricants
1.1 This test method covers a procedure for determining the
D5706 Test Method for Determining Extreme Pressure
friction and wear behavior of grease lubricated plastic socket
Properties of Lubricating Greases Using a High-
suspension joints, for validation of suspension joint greases
Frequency, Linear-Oscillation (SRV) Test Machine
and quality inspection for those greases under high-frequency
E45 Test Methods for Determining the Inclusion Content of
linear-oscillation motion using the SRV test machine.
Steel
1.2 The values stated in SI units are to be regarded as
G40 Terminology Relating to Wear and Erosion
4
standard. No other units of measurement are included in this
2.2 DIN Standards:
standard.
DIN 51631:1999 Special-boiling-point spirits - Require-
1.3 This standard does not purport to address all of the ments and testing
safety concerns, if any, associated with its use. It is the
DIN EN 10025-1:2005 Hot rolled products of structural
responsibility of the user of this standard to establish appro- steels - Part 1: General technical delivery conditions
priate safety and health practices and determine the applica-
DIN EN ISO 683-17 Heat-treated steels, alloy steels and
bility of regulatory limitations prior to use. free-cutting steels - Part 17: Ball and roller bearing steels
(replaces DIN 17230-1980)
2. Referenced Documents
DIN EN ISO 13565-2:1998 Geometrical Product Specifica-
3
2.1 ASTM Standards:
tions (GPS) - Surface texture: Profile method - Surfaces
A295 Specification for High-Carbon Anti-Friction Bearing having stratified functional properties - Part 2: Height
Steel
characterization using the linear material ratio curve
D217 Test Methods for Cone Penetration of Lubricating
3. Terminology
Grease
3.1 Definitions:
1
3.1.1 break-in, n—in tribology, an initial transition process
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
occurring in newly established wearing contacts, often accom-
Subcommittee D02.G0 on Lubricating Grease.
panied by transients in coefficient of friction or wear rate, or
Current edition approved Dec. 1, 2011. Published March 2012. Originally
both, which are uncharacteristic of the given tribological
approved in 2010. Last previous edition approved in 2010 as D7420–10.
system’s long-term behavior. G40
DOI:10.1520/D7420–11.
2
TRW Fahrwerksysteme (Chassis Systems), D-50543, Düsseldorf, Germany.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from Beuth Verlag GmbH (DIN-- DIN Deutsches Institut fur
Standards volume information, refer to the standard’s Document Summary page on Normunge.V.),Burggrafenstrasse6,10787,Berlin,Germany,http://www.en.din.de.
the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D7420 − 11
3.1.2 coeffıcient of friction, µ or ƒ, n—in tribology, the 3.3.1 SRV, n—Schwingung, Reibung, Verschleiß (German);
dimensionless ratio of the friction force (F) between two oscillating, friction, wear (English translation).
bodies to the normal force (N) pressing these bodies together.
4. Summary of Test Method
G40
4.1 This test method is performed on SRV test machine
3.1.3 lubricant, n—any material interposed between two
using a polymeric disk having three flat pins oscillating at 50
surfacesthatreducesthefrictionorwearbetweenthem. D4175
Hz against a steel test disk with lubricant (grease) between
3.1.4 lubricating grease, n—a semi–fluid to solid product of
them. Test load is fixed to 2000 N using a test temperature of
a dispersion of a thickener in a liquid lubricant
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D7420–10 Designation:D7420–11
Standard Test Method for
Determining Tribomechanical Properties of Grease
Lubricated Plastic Socket Suspension Joints Using a High-
1
Frequency, Linear-Oscillation (SRV) Test Machine
This standard is issued under the fixed designation D7420; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This test method was originally published as bilingual company standard TRW 62 051 301 in June
2
2002.TRWFahrwerksysteme transferredthecopyrightonOct.5,2004tostandardizationbodies.The
DIN 51834 working group has modified this standard by adding precision information based on round
robin tests.
1. Scope*
1.1 This test method covers a procedure for determining the friction and wear behavior of grease lubricated plastic socket
suspension joints, for validation of suspension joint greases and quality inspection for those greases under high-frequency
linear-oscillation motion using the SRV test machine.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
3
2.1 ASTM Standards:
A295 Specification for High-Carbon Anti-Friction Bearing Steel
D217 Test Methods for Cone Penetration of Lubricating Grease
D4175 Terminology Relating to Petroleum, Petroleum Products, and Lubricants
D5706 Test Method for Determining Extreme Pressure Properties of Lubricating Greases Using a High-Frequency,
Linear-Oscillation (SRV) Test Machine
E45 Test Methods for Determining the Inclusion Content of Steel
G40 Terminology Relating to Wear and Erosion
4
2.2 DIN Standards:
DIN 51631:1999 Special-boiling-point spirits - Requirements and testing
DIN EN 10025-1:2005 Hot rolled products of structural steels - Part 1: General technical delivery conditions
DIN EN ISO 683-17 Heat-treated steels, alloy steels and free-cutting steels - Part 17: Ball and roller bearing steels (replaces
DIN 17230-1980)
DIN EN ISO 13565-2:1998 Geometrical Product Specifications (GPS) - Surface texture: Profile method - Surfaces having
stratified functional properties - Part 2: Height characterization using the linear material ratio curve
2.3 ISO Standard:
ISO 1250:1972 Mineral solvents for paints -- White spirits and related hydrocarbon solvents
1
This test method is under the jurisdiction ofASTM Committee D02 on Petroleum Products and Lubricants and is the direct responsibility of Subcommittee D02.G0 on
Lubricating Grease.
Current edition approved March 1, 2010. Published April 2010. DOI:10.1520/D7420–10.
Current edition approved Dec. 1, 2011. Published March 2012. Originally approved in 2010. Last previous edition approved in 2010 as D7420–10. DOI:10.1520/
D7420–11.
2
TRW Fahrwerksysteme (Chassis Systems), D-50543, Düsseldorf, Germany.
3
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
4
Available from Beuth Verlag GmbH (DIN-- DIN Deutsches Institut fur Normung e.V.), Burggrafenstrasse 6, 10787, Berlin, Germany, http://www.en.din.de.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D7420–11
3. Terminology
3.1 Definitions:
3.1.1 break-in, n—in tribology,aninitialtransitionprocessoccurringinnewlyestablishedwearingcontacts,oftenaccompanied
by transients in coefficient of friction or wear rate, or both, which are uncharacteristic of the given tribological system’s long-term
behavior. G40
2
---------------------- Page: 2 ----------------------
D7420–11
3.1.2 coeffıcient of friction, µ or ƒ, n—in tribology, the dimensionless ratio of the friction force (F) between two bodies to the
normal force (N) pressing these bodies together. G40
3.1.3 lubricant, n—any material interposed between two surfaces tha
...
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