ASTM C394 C394M-2016 Standard Test Method for Shear Fatigue of Sandwich Core Materials《夹层芯材剪切疲劳的标准试验方法》.pdf
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1、Designation: C394/C394M 16Standard Test Method forShear Fatigue of Sandwich Core Materials1This standard is issued under the fixed designation C394/C394M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revision. A
2、 number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method determines the effect of repeated shearforces on core material used in sandwich panels. Permissiblecore material form
3、s include those with continuous bondingsurfaces (such as balsa wood and foams) as well as those withdiscontinuous bonding surfaces (such as honeycomb).1.2 This test method is limited to test specimens subjectedto constant amplitude uniaxial loading, where the machine iscontrolled so that the test sp
4、ecimen is subjected to repetitiveconstant amplitude force (stress) cycles. Either shear stress orapplied force may be used as a constant amplitude fatiguevariable.1.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system ma
5、y 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. Within the text, the inch-pound units areshown in brackets.1.4 This standard does not purport to address all of thesafety c
6、oncerns, 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:2C271/C271M Test Method for Density o
7、f Sandwich CoreMaterialsC273/C273M Test Method for Shear Properties of SandwichCore MaterialsD883 Terminology Relating to PlasticsD3878 Terminology for Composite MaterialsD5229/D5229M Test Method for MoistureAbsorption Prop-erties and Equilibrium Conditioning of Polymer MatrixComposite MaterialsE6 T
8、erminology Relating to Methods of Mechanical TestingE122 Practice for Calculating Sample Size to Estimate, WithSpecified Precision, the Average for a Characteristic of aLot or ProcessE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE456 Terminology Relating to Quality and Sta
9、tisticsE467 Practice for Verification of Constant Amplitude Dy-namic Forces in an Axial Fatigue Testing SystemE739 Practice for StatisticalAnalysis of Linear or LinearizedStress-Life (S-N) and Strain-Life (-N) Fatigue DataE1012 Practice for Verification of Testing Frame and Speci-men Alignment Under
10、 Tensile and Compressive AxialForce Application2.2 ISO Standards3ISO 13003:2003(E) Fibre-reinforced plastics: Determinationof fatigue properties under cyclic loading conditions3. Terminology3.1 Definitions:3.1.1 Terminology D3878 defines terms relating to high-modulus fibers and their composites, as
11、 well as terms relatingto sandwich constructions. Terminology D883 defines termsrelating to plastics. Terminology E6 defines terms relating tomechanical testing. Terminology E456 and Practice E177define terms relating to statistics. In the event of a conflictbetween terms, Terminology D3878 shall ha
12、ve precedenceover the other terminologies.NOTE 1If the term represents a physical quantity, its analyticaldimensions are stated immediately following the term (or letter symbol) infundamental dimension form, using the following ASTM standard sym-bology for fundamental dimensions, shown within square
13、 brackets: Mfor mass, L for length, T for time, for thermodynamic temperature,and nd for non-dimensional quantities. Use of these symbols is restrictedto analytical dimensions when used with square brackets, as the symbolsmay have other definitions when used without the brackets.3.2 Definitions:1Thi
14、s test method is under the jurisdiction of ASTM Committee D30 onComposite Materials and is the direct responsibility of Subcommittee D30.09 onSandwich Construction.Current edition approved April 1, 2016. Published April 2016. Originallyapproved in 1957. Last previous edition approved in 2013 as C394
15、 13. DOI:10.1520/C0394_C0394M-16.2For 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.3Available from Internationa
16、l Organization for Standardization (ISO), 1, ch. dela Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http:/www.iso.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.2.1 constant amplitude loading, nin fatigue, a loading inwhi
17、ch all of the peak values of force (stress) are equal and allof the valley values of force (stress) are equal.3.2.2 fatigue loading transition, nin the beginning offatigue loading, the number of cycles before the force (stress)reaches the desired peak and valley values.3.2.3 force (stress) ratio, R
18、nd, nin fatigue loading, theratio of the minimum applied force (stress) to the maximumapplied force (stress), where positive force (stress) correspondsto the tension mode of loading.3.2.4 frequency, f T-1, nin fatigue loading, the number offorce (stress) cycles completed in 1 s (Hz).3.2.5 peak, nin
19、fatigue loading, the occurrence where thefirst derivative of the force (stress) versus time changes frompositive to negative sign; the point of maximum force (stress)in constant amplitude loading.3.2.6 residual strength, ML-1T-2, nthe value of force(stress) required to cause failure of a specimen un
20、der quasi-static loading conditions after the specimen is subjected tofatigue loading.3.2.7 run-out, nin fatigue, an upper limit on the number offorce cycles to be applied.3.2.8 spectrum loading, nin fatigue, a loading in whichthe peak values of force (stress) are not equal or the valleyvalues of fo
21、rce (stress) are not equal (also known as variableamplitude loading or irregular loading).3.2.9 valley, nin fatigue loading, the occurrence where thefirst derivative of the force (stress) versus time changes fromnegative to positive sign; the point of minimum force (stress)in constant amplitude load
22、ing.3.2.10 wave form, nthe shape of the peak-to-peak varia-tion of the force (stress) as a function of time.3.3 Symbolsb = width of specimen, mm inCV = coefficient of variation statistic of a sample populationfor a given property (in percent)L = length of specimen, mm inN = number of constant amplit
23、ude cyclesP = force on specimen, positive for tension mode of loading,N lbR = fatigue force (stress) ratio, minimum-to-maximumcyclic force (stress)Sn1= standard deviation statistic of a sample population fora given propertyx1= test result for an individual specimen from the samplepopulation for a gi
24、ven propertyx = mean or average (estimate of mean) of a samplepopulation for a given property = core shear stress, MPa psi4. Summary of Test Method4.1 This test method consists of subjecting a sandwich coreto cyclic shear force parallel to the plane of its faces. The forceis transmitted to the core
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