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This distance may represent an average of several measurements along the crack front. E crack-extension force, G [FL? The SZW is co-planar with the original unloaded fatigue precrack and refers to an extenE sion of the original crack.

Also known as cyclic loading. This estimate of pseudo-crack advance, DaBis based on the effective yield strength of the material tested. 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.

This discontinuity is characterized by a sudden increase in displacement and, generally, a decrease in force. E slow stable crack extension [L]—a displacement controlled e18223 extension beyond the stretch zone width. For specimens, this is the time required for the creep deformation zone to spread through a substantial portion of the e18233 ligament.

E environment chamber volume [L3]—in fatigue testing, that bulk volume surrounding a test specimen.

Early data pertained almost exclusively to mild steels, namely, to S a? Originally approved in From past usage, G is commonly associated with linear-elastic methods of analysis, although the J see J-integral also may be used for such E analyses.

E environment volume [L3]—in fatigue testing, the total volume immediately surrounding a test specimen plus that contained in a circulating reservoir if applicable. An effect or difference between populations is said to be present if sstm value of a test statistic is signi?

E independent variable—the selected and controlled variable namely, stress or strain.

E specimen thickness, B [L]—the distance between the parallel EE sides of a test specimen see Fig. For other orientations, a bend or compact specimen should be used. However, in service components and perhaps in f1823 specimenscaution is needed to adequately consider loading interior to G such as from motion of the crack and from residual and thermal stress.

K-decreasing test—a test in which the normalized K-gradient is nominally negative.

A strain gaged specimen is often used as a dynamometer. It is not the same as a con? E environment monitoring— in fatigue testing, the periodic or continuous measurement of?

## ASTM E1823 – 13

It shall consist of an instrumented member having mass, stiffness, and end displacements such that the inertial effects of the specimen and its attachments to the testing machine for which the veri? E estimate—in statistical analysis, the particular value or values of a parameter computed by an estimation procedure for a given sample. For linear-elastic bodies, the three stress-strain? It is an estimate of the relationship between applied stress and the percentage of the population that would survive N cycles.

E fatigue limit, S f [FL? E group—in fatigue, specimens of the same type tested at a speci? E ideal-crack-tip stress? This is also known as the median fatigue strength for N cycles. For force histories with hold times see Fig.

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

E — 05ae1 plastic-zone adjustment, r Y [L]—an addition to the physical crack size to asmt for plastic crack-tip deformation enclosed by a linear-elastic stress?

E tolerance interval—an interval computed so that it will include at least a stated percentage of the population with a stated probability. Your comments will receive careful consideration at a meeting of the responsible technical d1823, which you may attend.

For example, in Fig. At the critical crack size, the width of the crack front is approximately one third the E dimension B.

The effective unloading line is designated as having an origin at the high point where the displacement reverses direction on unloading slot mouth begins to close and joining the low point on the reloading line where the force is f1823 half that at the high point.

E E crack length, a [L]—See crack size and surface crack length. The following identity is true for the normalized K-gradient in a constant force-ratio test: For many engineering materials, deviations qstm linear elastic behavior and hysteresis are commonly observed to varying degrees. E peak—in fatigue loading, the point where the?

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

The symbol code of abbreviations for specimen con? It is denoted X when plotted on E appropriate coordinates. E circulation rate [L3 T?

E theoretical elastic stress concentration factor or stress concentration factor kt —the ratio of the greatest stress in 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. This deviation is expressed in terms of strain.

E pop-in—a discontinuity in the force against clip gage displacement record. E environment composition [ML? 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.

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. Another method for calculation of ae involves comparing the compliance from the secant of a force-de?

In constant amplitude loading, the range is given as follows: Examples are given in Fig. 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.