ASTM_G_163_-_10.pdf

Designation:G16310Standard Guide forDigital Data Acquisition in Wear and Friction Measurements1This standard is issued under the fixed designation G163;the number immediately following the designation indicates the year oforiginal adoption or,in 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 guide covers the providing of general guidance inapplying hardware and software to digitally acquire wear andfriction data in laboratory test systems.It points out importantconsiderations in such data acquisition.It does not makespecific recommendations or discuss specific details regardingcommercial hardware or software.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility 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:2G40 Terminology Relating to Wear and ErosionG77 Test Method for Ranking Resistance of Materials toSliding Wear Using Block-on-Ring Wear TestG83 Test Method for Wear Testing with a Crossed-CylinderApparatus(Withdrawn 2005)3G99 Test Method for Wear Testing with a Pin-on-DiskApparatusG115 Guide for Measuring and Reporting Friction Coeffi-cientsG118 Guide for Recommended Format of Wear Test DataSuitable for Databases3.Terminology3.1 Definitions:3.1.1 coeffcient of friction,nthe dimensionless ratio of thefriction force between two bodies to the normal force pressingthe bodies together.3.1.2 wear,nalteration of a solid surface by progressiveloss or progressive displacement of material due to relativemotion between that surface and a contacting substance orsubstances.G403.2 Definitions of Terms Specific to This Standard:3.2.1 hardware,nmechanical and electronic componentsin instrumentation used to acquire data.3.2.2 software,ncomputer code that can be executed tocontrol hardware systems and store data.4.Summary of Guide4.1 Several important issues relating to digital data acquisi-tion in wear and friction measurements are identified andexplained.Hardware and software choices are described ingeneral terms,along with some important considerations indata storage.5.Significance and Use5.1 This guide illustrates the steps and considerations in-volved with digital data acquisition.While analog recording ofwear and friction data has been in the past,digital dataacquisition and storage is used extensively.It is important thatDAQ users understand how data is collected and stored andhow data manipulation may affect raw data integrity.5.2 Multi-station wear and friction testing is increasing inuse,and because of the increased volume of data in suchapproaches,the use of digital data acquisition facilitates suchtesting.5.3 The same hardware and software used for the initialanalog data conversion to digital form can often also be usedfor initial data processing,for example,multiple-point averag-ing.This can conveniently lead to computer-based storage ofprocessed data in digital form.However,where possible,thestorage of unfiltered(software filters)and unmanipulated datawill allow reevaluation of original data should calibrationcoefficients need to be adjusted.5.4 Databases are frequently constructed in computerizedformat(see Guide G118)in order to hold large amounts ofwear and friction data from laboratory test programs.1This guide is under the jurisdiction of ASTM Committee G02 on Wear andErosion and is the direct responsibility of Subcommittee G02.20 on Data Acquisi-tion in Tribosystems.Current edition approved April 1,2010.Published April 2010.Originallyapproved in 1999.Last previous edition approved in 2004 as G16399(2004).DOI:10.1520/G0163-10.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Hardware and Software6.1 HardwareNecessary electronic components associ-ated with the wear test system include sensors(for example,force transducers,strain gages,linear variable differentialtransformers),a data acquisition system(for example,analogsignal conditioners,filters,analog-to-digital convertors,otherelectronic circuits),a controlling computer,and a digital datastorage device.These items can be bought commercially,orconstructed specifically for the task(1-3).46.2 Data Acquisition SystemTypically consists of an elec-tronic amplifier/filter system tha