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E response curve for N cycles—a curve? It is a point estimate of the percentage of the population between the same two stated values. Accordingly, it is asm to analyze log N using methods based on the normal E distribution. The parameter rc is the unloading slope ratio at the critical crack size.

For predicting crack-growth lives generated under various R conditions, the life prediction methodology E must be consistent with satm data reporting methodology. E cyclic loading—See fatigue loading. The orientation of the crack plane should be identi? The corresponding customary unit is mil.

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. Usually the electrical E voltage increases linearly with applied force.

The reference plane is de? The J-integral, JIc, is measured using the operational procedure and satisfying all of the validity requirements speci? The curve indicates the S-N relationship for a speci? The SZW is co-planar with the original unloaded fatigue precrack and refers to an extenE sion of the original crack.


The symbol N see de?

E E sharp-notch strength, ss [FL? E force transducer—a device which indicates the applied force by means of an electrical voltage.

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

If the sample size is even, it is the average of the two middlemost values. Using the coordinates shown in Fig.

In test specimens, the two surfaces parallel to this plan view are termed side surfaces, and the four surfaces normal to this plan view the boundaries in the plan view are termed edge surfaces.

See Test Method E for further explanations on symbols. E mechanics tests, which are directly applicable in fracture control. E remaining ligament, b [L]—the difference between the width of the specimen w and the physical crack size ap that is, b 5 W 2 ap 17 E point estimate—the estimate of a parameter given by a single statistic, for example, sample average see sample average arithmetic average.

The other component is due to variability in the test method application. 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.

Standard Terminology Relating to Fatigue and Fracture Testing

This estimate of pseudo-crack advance, DaBis based on the effective yield strength of the material tested. E precision—the closeness of agreement between randomly selected individual measurements or test qstm for a given set of experimental variables.


E environment temperature— in fatigue testing, the temperature of the bulk volume surrounding a test specimen. E fatigue notch satm, q—a measure of the degree of agreement between fatigue notch factor, kf, and theoretical stress concentration factor, kt.

E environment pressure [FL? The values obtained by the two methods may differ. E tolerance limits—the two statistics that de? E blunting line—in fracture testing, a line that approximates apparent crack advance due to crack-tip blunting in the absence of slow stable crack tearing.

These specimens are frequently tested at a mean stress of zero. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. 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.

E This value corresponds to P max. E stress-intensity factor at crack initiation, Ko [FL?