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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 28 zero crossings—in fatigue loading, the number of times that the force-time history crosses zero force level with a positive slope or negative slope, or both, as speci?

E stress concentration factor—See theoretical stress concentration factor or stress concentration factor k t. Also see crack length in the Description of Terms. This estimate of pseudo-crack advance, DaBis based on the effective yield strength of the material tested. Ast, sample percentage—the percentage of observed values between two stated values of the variable under consideration. E environment oxygen content [ML?

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The value of SN thus determined is subject to the same conditions as those which apply to the S? E reference electrode—the electrode for example, hydrogen aztm, normal calomel electrode, or saturated calomel electrode e18823 which the electrical potential of a specimen is measured. E e8123 thickness, B [L]—the distance between the parallel EE sides of a test specimen see Fig.

However, in service components and perhaps in ast specimenscaution is needed to adequately consider loading interior to G such as from motion of the crack and from residual and thermal stress.


NOTE—It is recommended that the arabic subscript 1 be omitted except where needed for clarity. E pop-in—a discontinuity in the force against clip gage displacement record. 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.

Accordingly, it is convenient to analyze log N using methods based on the normal E distribution. Examples are given in Fig.

ASTM E1823 – 13

Traditionally, the symbol for stress is either S or sas a matter of choice. A dynamometer for use in tension and in compression will have two dynamometer ranges, one in tension and one in E compression.

The values obtained by the two methods may differ.

E load [F]—see force E force-line displacement resulting from creep, Vc [L]— displacement at the loading pins from cracking associated with creep strain accumulation. E clipping—in fatigue spectrum loading, the process of decreasing or increasing the magnitude of all loads strains that are, respectively, above or below a speci?

The SZW is co-planar with the original unloaded fatigue precrack and refers to an extenE sion asttm the original crack. For small sample sizes, s underestimates the population standard deviation. E Caution is required in extending this concept to design. This measure is commonly used in the calculation of quantities descriptive of the stress and displacement?

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

For most materials an operational, though arbitrary, de? This is also known as the median fatigue strength for N cycles.

E acceptable J and D a values. A number in parentheses indicates the year of last reapproval. E environment pressure [FL? It represents the stress at fracture normal to and remote from the plane of the crack. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. E This value corresponds to P max. The parameter tt can be separated into hold and non-hold that is, steady and dynamic components: 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.


For force histories with hold times see Fig. 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?

It is presented in parentheses and follows the designations for the specimen con? The reference load may be identical to the mean force E of the history, but this is not required.

E dynamometer—an elastic calibration device used to verify the indicated forces applied by a fatigue testing system. The following list contains examples of applied loading. Tensile strength is calculated from the maximum force during a tension test carried to rupture and the original cross-sectional area of the specimen. For any particular point, r is the value that would be measured if an unloading-reloading E cycle were performed at that point.

The curve indicates the S-N relationship for a speci?

Standard Terminology Relating to Fatigue and Fracture Testing

By convention, tensile forces are positive and compressive forces are negative. In Test Method EK-decreasing tests involve force shedding as the crack grows either E continuously or by a series of decremental steps. The e8123 p is everywhere implied.