1、Designation:B97515Standard Test Method forMeasurement of Internal Stress of Metallic Coatings by SplitStrip Evaluation(Deposit Stress Analyzer Method)1This standard is issued under the fixed designation B975;the number immediately following the designation indicates the year oforiginal adoption or,i
2、n 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.INTRODUCTIONThe deposit stress analyzer method provides a rapid,accurate,and economical means for t
3、hedetermination of the internal tensile and compressive stress in metallic and nonmetallic coatings.Internal stress is expressed in pounds per square inch or megapascals.This procedure for measuringinternal stress offers the advantages of test specimens that are pre-calibrated by the manufacturer,as
4、mall test specimen coating surface area,and rapid determination of the internal stress in the appliedcoating.1.Scope1.1 This test method for determining the internal tensile orcompressive stress in applied coatings is quantitative.It isapplicable to metallic layers that are applied by the processeso
5、f electroplating or chemical deposition that exhibit internaltensile or compressive stress values from 500 to 145 000 psi(3.45 to 1000 MPa).1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provide
6、d for information onlyand are not considered standard.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
7、regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2B636 Test Method for Measurement of Internal Stress ofPlated Metallic Coatings with the Spiral ContractometerE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlab
8、oratory Study toDetermine the Precision of a Test Method2.2 IEC Standard:3IEC 61010 Safety Requirements for Electrical Equipmentfor Measurement,Control,and Laboratory Use3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 average deposit thickness,naverage deposit thick-ness equals
9、 the deposit weight in grams divided by the specificgravity of the deposit in grams per cubic centimetre multipliedby the plated deposit surface area per test strip(see Eq 3).3.1.2 constant K,nthis certifiable calibrated number isdetermined experimentally for each lot of test strips manufac-tured to
10、 enable simple mathematical calculation of the internaldeposit stress while factoring the influence of percent elonga-tion difference between the deposit and the substrate withoutthe use of complicated bent strip formulas.See Note 4.3.1.3 helix,nmetal strip approximately 0.01 to 0.013 in.(0.025 to 0
11、.033 cm)thick formed as a helix approximately 0.9in.(2.3 cm)in diameter and 0.61 in.(15.5 cm)long with orwithout a polytetrafluoroethylene(PTFE)coating on the insidesurface.3.1.4 internal stress,nstress in a given layer of coatingcan result from foreign atoms or materials in the layer thatstress the
12、 natural structure of the deposit as the coating is beingformed from sources independent of foreign atoms such asmisfit dislocations and the result of additional processing.3.1.4.1 DiscussionStress that develops in a given layer of1This test method is under the jurisdiction ofASTM Committee B08 on M
13、etallicand Inorganic Coatings and is the direct responsibility of Subcommittee B08.10 onTest Methods.Current edition approved Nov.1,2015.Published December 2015.DOI:10.1520/B975-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.F
14、or Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from International Electrotechnical Commission(IEC),3,rue deVaremb,P.O.Box 131,1211 Geneva 20,Switzerland,http:/www.iec.ch.Copyright ASTM International,100 Barr Harbor Drive,
15、PO Box C700,West Conshohocken,PA 19428-2959.United States1 material is measured as pounds per square inch or megapascalswhere 1 MPa=145 psi.3.1.5 measuring stand,nthis stand supports the test stripabove a logarithmic scale that enables determination of thetotal number of increments spread between th
16、e test strip legtips.3.1.6 modulus of elasticity,nstress required to produceunit strain,which may be a change in length(Youngsmodulus),a twist of shear(modulus of rigidity or modulus oftorsion),or a change in volume(bulk modulus).3.1.7 on site specimen holder,nthis device holds a teststrip during the application of a coating.3.1.7.1 DiscussionAnodes are located external to thespecimen holder.3.1.8 power supply,nrectifier to supply amperage forplating.3.1.9 self-contained plating cell,nthis cell
