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ASTM D7420-10

(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.

General Information

Status
Historical
Publication Date
28-Feb-2010
ICS
21.080 - Hinges, eyelets and other articulated joints
21.260 - Lubrication systems
Technical Committee
D02 - Petroleum Products, Liquid Fuels, and Lubricants
Drafting Committee
D02.G0 - Lubricating Grease
Current Stage
Ref Project

Relations

Replaced By
ASTM D7420-11 - Standard Test Method for Determining Tribomechanical Properties of Grease Lubricated Plastic Socket Suspension Joints Using a High-Frequency, Linear-Oscillation (SRV) Test Machine
Effective Date
01-Dec-2011

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ASTM D7420-10 - Standard Test Method for Determining Tribomechanical Properties of Grease Lubricated Plastic Socket Suspension Joints Using a High-Frequency, Linear-Oscillation (SRV) Test MachineASTM D7420-10 - Standard Test Method for Determining Tribomechanical Properties of Grease Lubricated Plastic Socket Suspension Joints Using a High-Frequency, Linear-Oscillation (SRV) Test Machine
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ASTM D7420-10 - Standard Test Method for Determining Tribomechanical Properties of Grease Lubricated Plastic Socket Suspension Joints Using a High-Frequency, Linear-Oscillation (SRV) Test Machine
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D7420–10
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 Properties of Lubricating Greases Using a High-
Frequency, Linear-Oscillation (SRV) Test Machine
1.1 This test method covers a procedure for determining the
E45 Test Methods for Determining the Inclusion Content of
friction and wear behavior of grease lubricated plastic socket
Steel
suspension joints, for validation of suspension joint greases
G40 Terminology Relating to Wear and Erosion
and quality inspection for those greases under high-frequency
4
2.2 DIN Standards:
linear-oscillation motion using the SRV test machine.
DIN 51631:1999 Special-boiling-point spirits - Require-
1.2 The values stated in SI units are to be regarded as
ments and testing
standard. No other units of measurement are included in this
DIN EN 10025-1:2005 Hot rolled products of structural
standard.
steels - Part 1: General technical delivery conditions
1.3 This standard does not purport to address all of the
DIN EN ISO 683-17 Heat-treated steels, alloy steels and
safety concerns, if any, associated with its use. It is the
free-cutting steels - Part 17: Ball and roller bearing steels
responsibility of the user of this standard to establish appro-
(replaces DIN 17230-1980)
priate safety and health practices and determine the applica-
DIN EN ISO 13565-2:1998 Geometrical Product Specifica-
bility of regulatory limitations prior to use.
tions (GPS) - Surface texture: Profile method - Surfaces
2. Referenced Documents
having stratified functional properties - Part 2: Height
3
characterization using the linear material ratio curve
2.1 ASTM Standards:
5
2.3 ISO Standard:
A295 Specification for High-Carbon Anti-Friction Bearing
ISO 1250:1972 Mineral solvents for paints -- White spirits
Steel
and related hydrocarbon solvents
D217 Test Methods for Cone Penetration of Lubricating
Grease
3. Terminology
D4175 Terminology Relating to Petroleum, Petroleum
3.1 Definitions:
Products, and Lubricants
3.1.1 break-in, n—in tribology, an initial transition process
D5706 Test Method for Determining Extreme Pressure
occurring in newly established wearing contacts, often accom-
panied by transients in coefficient of friction or wear rate, or
1 both, which are uncharacteristic of the given tribological
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee system’s long-term behavior. G40
D02.G0 on Lubricating Grease.
Current edition approved March 1, 2010. Published April 2010. DOI:10.1520/
D7420–10.
2 4
TRW Fahrwerksysteme (Chassis Systems), D-50543, Düsseldorf, Germany. Available from Beuth Verlag GmbH (DIN-- DIN Deutsches Institut fur
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Normunge.V.),Burggrafenstrasse6,10787,Berlin,Germany,http://www.en.din.de.
5
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from International Organization for Standardization (ISO), 1, ch. de
Standards volume information, refer to the standard’s Document Summary page on la Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, http://
the ASTM website. www.iso.ch.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D7420–10
3.1.2 coeffıcient of friction, µ or ƒ, n—in tribology, the 4. Summary of Test Method
dimensionless ratio of the friction force (F) between two
4.1 This test method is performed on SRV test machine
bodies to the normal force (N) pressing these bodies together.
using a polymeric disk having three flat pins oscillating at 50
G40
Hz against a steel test disk with lubricant (grease) between
3.1.3 lubricant, n—any material interposed between two
them. Test load is fixed to 2000 N using a test temperature of
surfaces that reduces the friction or wear between them.
50°C and a stroke of 1.5 mm during a test time of 2 h.
D4175
NOTE 1—Test frequency, stroke length,
...

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SCOPE
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