1、Designation:G13797(Reapproved 2009)Standard Test Method forRanking Resistance of Plastic Materials to Sliding WearUsing a Block-On-Ring Configuration1This standard is issued under the fixed designation G137;the number immediately following the designation indicates the year oforiginal adoption or,in
2、 the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a laboratory procedure tomeasure the resistance of plastic materi
3、als under dry slidingconditions.The test utilizes a block-on-ring geometry to rankmaterials according to their sliding wear characteristics undervarious conditions.1.2 The test specimens are small so that they can be moldedor cut from fabricated plastic parts.The test may be run at theload,velocity,
4、and temperature which simulate the servicecondition.1.3 Wear test results are reported as specific wear ratescalculated from volume loss,sliding distance,and load.Mate-rials with superior wear resistance have lower specific wearrates.1.4 This test method allows the use of both single-andmulti-statio
5、n apparatus to determine the specific wear rates.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility
6、of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D618 Practice for Conditioning Plastics for TestingD3702 Test Method for Wear Rate and Coefficient of F
7、ric-tion of Materials in Self-Lubricated Rubbing ContactUsing a Thrust Washer Testing MachineE122 Practice for Calculating Sample Size to Estimate,WithSpecified Precision,the Average for a Characteristic of aLot or ProcessG40 Terminology Relating to Wear and ErosionG77 Test Method for Ranking Resist
8、ance of Materials toSliding Wear Using Block-on-Ring Wear TestG117 Guide for Calculating and Reporting Measures ofPrecision Using Data from Interlaboratory Wear or Ero-sion Tests3.Terminology3.1 Definitions:3.1.1 weardamage to a solid surface,generally involvingprogressive loss of material,due to re
9、lative motion betweenthat surface and a contacting substance or substances.3.1.2 Additional definitions relating to wear are found inTerminology G40.3.2 Definitions of Terms Specific to This Standard:3.2.1 specific wear ratethe volume loss per unit slidingdistance,divided by the load.It can be calcu
10、lated as the volumeloss per unit time,divided by the load and the sliding velocity.3.2.2 steady state specific wear ratethe specific wear ratethat is established during that part of the test when the specificwear rate remains substantially constant(the specific wear rateversus sliding distance curve
11、 flattens out considerably with lessthan 30%difference between the specific wear rates)during aminimum of three time intervals spanning a total time durationof at least 18 h,with ideally no single interval exceeding 8 h.However,one time interval during the steady state can be aslong as 16 h.4.Summar
12、y of Test Method4.1 A plastic block of known dimensions is brought intocontact with a counterface ring(usually metal)under con-trolled conditions of contact pressure and relative velocity.Thisis achieved using a block-on-ring configuration as illustrated inFig.1.Periodic weighing of the polymer bloc
13、k results in anumber of mass-time data points where the time relates to thetime of sliding.The test is continued until the steady state wearrate is established.Mass loss measurements made after thesteady state is established are used to determine the steady statespecific wear rate,which is the volum
14、e loss per unit sliding1This test method is under the jurisdiction of ASTM Committee G02 on Wearand Erosion and is the direct responsibility of Subcommittee G02.40 on Non-Abrasive Wear.Current edition approved May 1,2009.Published May 2009.Originallyapproved in 1995.Last previous edition appeared in
15、 2003 as G13797(2003).DOI:10.1520/G0137-97R09.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM Inter
16、national,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 distance per unit load.The frictional torque may also bemeasured during the steady state using a load cell.These datacan be used to evaluate the coefficiency of friction for the testcombination.NOTE1Another test method that utilizes a block-on-ring test configu-ration for the evaluation of plastics is Test Method G77.5.Significance and Use5.1 The specific wear rates determined by this test methodcan be used
