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E R-curve—a plot of crack-extension wstm as a function of stable crack extension, Dap or Dae. The other component is due to variability in the test method application. The effective crack size concept may be used to compute plasticity-adjusted values of stress-intensity factor, K, if the crack-tip plastic zone is surrounded by an elastic stress?

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 w1823 see points labeled Low in Fig. The symbol code of abbreviations for specimen con? EE crack extension, Da [L]—an increase in crack size.

The corresponding customary unit is mil. The parameter J is the difference in work per unit difference in crack area at a?

### Standard terminology relating to fatigue and fracture testing – CERN Document Server

For specimens thicker than the standard specimens, both B and W should be E speci? E plane-strain crack-arrest fracture toughness, KIa [FL? The extension stops when ast, applied displacement is held constant. This value is the difference in the stress-power per unit difference in crack area at a? E tolerance interval—an interval computed so that it will include at least a stated percentage of the population with a stated probability.

The following list contains examples of applied loading. E E sharp-notch strength, ss [FL?

## ASTM E1823 – 13

Last previous edition approved in as E — E E sample variance, s2—the sum of the squares of the differences between each observed value and the sample average divided by the sample size minus one.

E reference load [F]—for spectrum loading, used in Practices E to denote the loading level that represents a steadystate condition upon which load variations are superimposed. Results from tests of the latter type are often useful for fracture control, based upon either service asm or empirical correlations with tests analyzed using fracture mechanics.

E stress concentration factor—See theoretical stress concentration factor or stress concentration factor k t. E specimen thickness, B [L]—the distance between the parallel EE sides of a test specimen see Fig.

E original crack size, a o, [L]—the physical crack size at the EEEE start of testing.

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Excluding compressive forces in the calculation ofD K does not in?

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The radius in such specimens is believed to be small enough that any smaller radius would result in notch strength essentially unchanged from an engineering viewpoint. E frequency distribution—the way in which the frequencies of occurrence of members of a population, or a sample, are distributed in accordance with the values of the variable under consideration.

E dynamometer dynamic forces [F]—the maximum and minimum forces or aastm mean force and the force amplitude that correspond to the readings obtained from the dynamometer output according to an existing static ee1823.

E statistic—a summary value calculated from the observed values in a sample.

E irregular loading— See spectrum loading. E reference electrode—the electrode for example, hydrogen electrode, normal calomel electrode, or saturated calomel electrode satm which the electrical potential of a specimen is measured.

### ASTM E – 13 Standard Terminology Relating to Fatigue and Fracture Testing

satm The effective unloading slope ratio is measured by performing unloadingreloading cycles during the test as indicated schematically in Fig. The most widely used ratios are as follows 8 For further discussion, see Rice, J. E trough—See valley. This is designated the C-R orientation.

E stretch zone width SZW [L]—the length of crack extension that occurs during crack-tip blunting, for example, prior to the onset of unstable brittle crack extension, pop-in, or slow stable crack extension.