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It represents the stress at fracture normal to and remote from the plane of the crack.

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

E tolerance interval—an interval computed so that it will include at least a stated percentage of the population with a stated probability.

The other component is due to variability in the test method application. Special test setups may permit the separation of these two E components of variance. E crack size, a [L]—in Test Method Ethe physical crack size is represented as ap. E yield strength, sYS [FL? E exceedances spectrum— in fatigue loading, representation of spectrum loading contents by the number of times speci? E plane-strain crack-arrest fracture toughness, KIa [FL? The corresponding customary unit is ksi in.

The same system would be suitable for sheet, extrusions, and forgings with nonsymmetrical grain? EE EE physical crack size, a p [L]—the distance from a reference plane to the observed crack front. Greek symbols are listed in accordance with their spelling in English. The symbol N see de?

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

E response curve for N cycles—a curve? E environment monitoring— in fatigue testing, the periodic or continuous measurement of? E theoretical elastic stress concentration factor or stress concentration factor kt —the ratio of the greatest stress d1823 the region of a notch or other stress concentrator as determined by the theory of elasticity or by experimental procedures that give equivalent values to the corresponding nominal stress.


In general, the curves E should not be extrapolated to other values of p. E circulation rate [L3 T? E E sharp-notch strength, ss [FL? E E crack length, a [L]—See crack size and surface crack length. 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.

ASTM E1823 – 13

E fatigue—the process of progressive localized permanent structural change occurring in a material subjected to conditions that produce? 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.

However, when applied to a collection of data without further quali?

For each unloading-reloading trace, the effective unloading slope ratio, r, is de? Also see crack length in the Description of Terms. This distance may represent an average of several measurements along the awtm front. These specimens are frequently tested at a mean stress of zero. E statistic—a summary value calculated from the observed values in a sample. E tolerance limits—the two statistics that de? E fatigue cycle—See cycle. The corresponding customary unit is mil.

E creep zone boundary—the locus of points ahead of the crack front where the equivalent strain caused 1e823 the creep deformation equals the equivalent strain caused by the elastic deformation. The value of SN thus determined is subject to the same conditions as those which apply to the S? K-increasing test—a test in which the normalized K-gradient is nominally positive. The force transducer calibration may have been furnished by asm machine manufacE turer or may have been developed by the user.


This value is the difference in the stress-power per unit difference in crack area at a? For example, in Fig. Also known as variable amplitude loading or irregular E loading. The e123 can be determined from the appearance of propagating E fractures.

However, any test behavior is automatically characterized as smooth crackgrowth behavior unless it satis? E dynamometer dynamic forces [F]—the maximum and minimum forces or the mean force and the force amplitude that correspond to the readings obtained from the dynamometer output according to an existing static calibration.

E constant life diagram— in fatigue, a plot usually on rectangular coordinates of a family of curves each of which is for a single fatigue life, N, relating stress amplitude, Sa, to mean 3 stress, Sm, or maximum stress, Smax, or both, to minimum stress, Smin. E sample percentage—the percentage of observed values between two stated values of the variable under consideration.

The subscript p is everywhere implied. For anisotropic materials, displacements can be more complex.

K-decreasing test—a test in which the normalized K-gradient is nominally negative. By convention, tensile forces are positive and compressive forces are negative. A number in parentheses indicates the year of last reapproval. The result, sN, is given in Pa psi. E environment temperature— in fatigue testing, the temperature of the bulk volume surrounding a test specimen.