ASTM_F_1044_-_05_2011e1.pdf

Designation:F104405(Reapproved 2011)1Standard Test Method forShear Testing of Calcium Phosphate Coatings and MetallicCoatings1This standard is issued under the fixed designation F1044;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.1NOTEUnits information was editorially corrected in January 2012.1.Scope1.1 This test method covers shear testing of continuouscalcium phosphate coatings and metallic coatings adhering todense metal substrates at ambient temperatures.It assesses thedegree of adhesion of coatings to substrates,or the internalcohesion of a coating in shear,parallel to the surface plane.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 may involve hazardous materials,operations,and equipment.This standard does not purport toaddress all of the safety concerns,if any,associated with itsuse.It is the responsibility of the user of this standard toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE8/E8M Test Methods for Tension Testing of Metallic Ma-terials3.Terminology3.1 DefinitionsTerminology E6 shall be considered asapplying to the terms used in this test method.4.Summary of Test Method4.1 Shear Method for Calcium Phosphate or Metallic Coat-ings:4.1.1 This test method consists of subjecting a specimenassembly composed of one coated and one uncoated compo-nent to a shear load.The components to be tested may bebonded together directly by thermomechanical means(forexample,sintering or diffusion bonding)or may be bondedtogether by use of a polymeric adhesive.The adhesive may bein film form or bulk form,but it must have a minimum bulkshear strength of 34.5 MPa 5000 psi or as great as theminimum required adhesion or cohesion strength of thecoating,whichever is greater.4.1.2 The shear load must be applied parallel to the plane ofthe coating utilizing a tensile machine,which is capable ofdetermining the maximum strength of the coating or coatingattachment to the substrate interface.4.2 Shear Method for Metallic Coatings OnlyThe lapshear method consists of subjecting a porous coated area tosingle shear loading,generally utilizing suitable polymericadhesive or bone cement adhesive and test jig in a tensionmachine,and determining the maximum shear stress requiredto obtain separation(that is,the shear strength of the coating/substrate bond or shear strength of the coating).5.Significance and Use5.1 The shear test method is recommended for shear testingof calcium phosphate and metallic/substrate combinations andcan provide information on the adhesive or cohesive strengthof coatings under a uniaxial shear stress.5.2 The test method may be useful for comparative evalu-ation of adhesive or cohesive strengths of a variety of types ofcoatings.Information developed using this test method may beuseful for certain quality control and design purposes.5.3 The test method should not be considered to provide anintrinsic values for utilization directly in making calculationssuch as determining the ability of a coating to withstandspecified environmental stresses.5.4 Processing variables,such as substrate preparation priorto coating,surface texture,coating technique variables or1This 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 Oct.1,2011.Published January 2012.Originallyapproved in 1999.Last previous edition approved in 2005 as F1044 05.DOI:10.1520/F1044-05R11E01.2For 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 post-coating heat treatment,or heat may introduce a significanteffect on the results of the shear test.The specimen beingevaluated must be representative of the actual end-use coating.6.Apparatus6.1 Testing MachinesMachines used for testing shall con-form to the requirements of Practices E4.The loads used indetermining shear strength and yield strength shall be withinthe loading range of the testing machine as defined in PracticesE4.Se