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The code TS-L means that the crack-plane is perpendicular to a direction intermediate between T and S and the expected fracture is in the L direction. For other orientations, a bend or compact specimen should be used. The force transducer calibration may have been furnished by the machine manufacE turer or may have been developed by the user.
The orientation of the crack plane should be identi? Usually the electrical E voltage increases linearly with applied force.
E median fatigue life—the middle value of the observed fatigue lives, arranged in order of magnitude, of the individual specimens in a group tested under essentially identical conditions.
E loading unloading rate [F T? E unstable brittle crack extension [L]—an abrupt crack extension occurring with or without prior stable crack extension in a standard fracture test specimen under crosshead or clip E gage displacement control. However, in service components and perhaps in test specimenscaution is needed to adequately consider loading interior to G such as from motion of the crack and from residual and thermal stress.
It is a point estimate of the percentage of the population between the same two stated values. E fatigue notch sensitivity, q—a measure of the degree of agreement between fatigue notch factor, kf, and theoretical stress concentration factor, kt.
ASTM E – 13 Standard Terminology Relating to Fatigue and Fracture Testing
The second is an alphabetical listing of relevant abbreviations. The curve relates the stress-intensity factor to crack size and either applied force or displacement. From this plan view, the term edge which is normally used to represent a line represents a line boundary of the specimen. E compliance LF?
Standard Terminology Relating to Fatigue and Fracture Testing
E estimation—in statistical analysis, a procedure for making a statistical inference about the numerical values of one or more unknown population parameters from the observed values in a sample.
The symbol N see de? The extension stops when the applied displacement is held constant. However, when applied to a collection of data without further quali? In general, S-N curves should not be extrapolated beyond observed life values. This deviation is expressed in terms of strain. One component is due to the variability of the test material. E environment pressure [FL? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
E crack size, a [L]—a lineal measure of a principal planar dimension of a crack. The J-integral, JIc, is measured using the operational procedure and satisfying all of the validity requirements speci? This is designated the C-R orientation.
NOTE—It is recommended that the arabic subscript 1 be omitted except where needed for clarity. E environment chamber volume [L3]—in fatigue testing, that bulk volume surrounding a test specimen. The exact conversion factor is 4. E — 05ae1 plastic-zone adjustment, r Y [L]—an addition to the physical crack size to account for plastic crack-tip deformation enclosed by a linear-elastic stress?
Originally approved in Not applicable generally to anisotropic materials. This measure is commonly used in the calculation of quantities descriptive of the stress and displacement?
This aetm is characterized by a sudden increase in displacement and, generally, a decrease in force. E fatigue loading—periodic, or not periodic,?
It is presented in parentheses and follows the designations for the specimen con? The stress intensity factor, KIc, is measured using the operational procedure and satisfying all of the validity requirements speci?
E In Test Method Ethe? E reference load [F]—for spectrum loading, used in Practices E to denote the loading level that e1832 a steadystate condition upon which load variations are superimposed. Also see crack length in the Description of Terms. E independent variable—the selected and controlled variable namely, stress or strain.
The parameter tt can be separated into hold and non-hold aztm is, steady and dynamic components: In a linear-elastic homogeneous body, the signi? This estimate of pseudo-crack advance, DaBis based on the effective yield e8123 of the material tested. E stress concentration factor—See theoretical stress concentration factor or stress concentration factor k t. J-R curve—a plot of resistance to stable crack extension, Dap.
Tensile strength is calculated from the maximum force during a tension test carried to rupture and the original cross-sectional area of the specimen. The calculation of K a is based upon measurements of both the arrested crack size and ast, the crack-mouth opening displacements prior to initiation of a fast-running crack and shortly after crack arrest.
Standard terminology relating to fatigue and fracture testing – CERN Document Server
S-N curve—a plot of stress against the number of cycles to failure. EE specimen temperature, T [u]—in fatigue testing, the average temperature in the specimen test section during isothermal testing, or the temperature in the specimen test section at any instant of time during cyclic-temperature testing.
For the standard specimens in Test Method Ethe constant-force-amplitude test will result 16 low point, Low—the point on the reloading portion of an unloading-reloading cycle where the force is one half the high point force see points labeled Low in Fig. Excluding compressive forces in the calculation ofD K does not in? Otherwise, the k f data are not consistent and are markedly dependent on the type of notch, the fatigue life of interest, and the value of the mean stress.
Examples are given in Fig. The values obtained by the two methods may differ. Arabic numerals 1, 2, and 3 are used for the general case, and they represent opening, sliding, and tearing displacements, respectively.