ASTM_F_1160_-_14.pdf

Designation:F116014Standard Test Method forShear and Bending Fatigue Testing of Calcium Phosphateand Metallic Medical and Composite Calcium Phosphate/Metallic Coatings1This standard is issued under the fixed designation F1160;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 test method covers the procedure for determiningthe shear and bending fatigue performance of calcium phos-phate coatings and of porous and nonporous metallic coatingsand for determining the bending fatigue performance ofmetallic coatings over sprayed with calcium phosphate.Thistest method has been established based on plasma-sprayedtitanium and plasma-sprayed hydroxylapatite coatings.Theefficacy of this test method for other coatings has not beenestablished.In the shear fatigue mode,this test methodevaluates the adhesive and cohesive properties of the coatingon a metallic substrate.In the bending fatigue mode,this testmethod evaluates both the adhesion of the coating as well asthe effects that the coating may have on the substrate material.These methods are limited to testing in air at ambient tempera-ture.These test methods are not intended for application infatigue tests of components or devices;however,the testmethod which most closely replicates the actual loadingconfiguration is preferred.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the 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 regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E6 Terminology Relating to Methods of Mechanical TestingE466 Practice for Conducting Force Controlled ConstantAmplitude Axial Fatigue Tests of Metallic MaterialsE467 Practice for Verification of Constant Amplitude Dy-namic Forces in an Axial Fatigue Testing SystemE468 Practice for Presentation of Constant Amplitude Fa-tigue Test Results for Metallic MaterialsE1012 Practice for Verification of Testing Frame and Speci-men Alignment Under Tensile and Compressive AxialForce ApplicationE1832 Practice for Describing and Specifying a DirectCurrent Plasma Atomic Emission Spectrometer3.Terminology3.1 The definitions of terms relating to shear and fatiguetesting appearing in Terminology E6 shall be considered asapplying to the terms used in this test method.3.2 loading points,nobjects in contact with the test beamor bar used to apply force to the beam or bar,usually radiusedto con concentrate the force to a point or a line.4.Summary of Test Method4.1 Shear Fatigue Testing:4.1.1 The intent of the shear fatigue test is to determine theadhesive or cohesive strength,or both,of the coating.4.1.2 This test method is designed to allow the coating tofail at either the coating/substrate interface,within the coating,or at the interface between the coating and the adhesivebonding agent used to transmit the force to the coating.4.2 Bending Fatigue Testing:1This test method is under the jurisdiction ofASTM Committee F04 on Medicaland Surgical Materials and Devices and is the direct responsibility of SubcommitteeF04.15 on Material Test Methods.Current edition approved June 1,2014.Published July 2014.Originally approvedin 1991.Last previous edition approved in 2011 as F1160 05(2011).DOI:10.1520/F1160-14.2For 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 International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.2.1 The primary intent of the bending fatigue test is toquantify the effect that the coating has on the substrate it isapplied to.Secondarily,it may be used to provide a subjectiveevaluation of coating adhesion,(that is,spalling resistance,cracking resistance,and so forth).4.2.2 This test method is designed to first provide a substratefatigue strength to serve as a baseline to assess the effects of thecoating on the resulting fatigue strength of the system.5.Significance and Use5.1 The shear and bending fatigue tests are used to deter-mine the effect of variations in material,geometry,surfacecondition,stress,and so forth,on the fatigue resistance ofcoated metallic materials subjected to direct stress for up to 107cycles.These tests may be used as a relative g