6.4 StorageSpecimens that are subject to corrosion in room temperature air should be accordingly protected, preferably in an inert medium. The storage medium should generally be removed before testing using appropriate solvents, if necessary, without adverse effects upon the life of the specimens. 6.2 Once a technique has been established and approved for a specic material and test specimen conguration, change should not be made because of potential bias that may be introduced by the changed technique. Regardless of the machining, grinding, or polishing method used, the nal metal removal should be in a direction approximately parallel to the long axis of the specimen. This entire procedure should be clearly explained in the reporting since it is known to inuence fatigue behavior in the long life regime.

Obvious abnormalities, such as cracks, machining marks, gouges, undercuts, and so forth, are not acceptable. Specimens should be cleaned prior to testing with solvent(s) non-injurious and non-detrimental to the mechanical properties of the material in order to remove any surface oil lms, ngerprints, and so forth. Dimensional analysis and 6.5 InspectionVisual 6.3 The effects to be most avoided are llet undercutting and residual stresses introduced by specimen machining prac3 Copyright by ASTM Int'l (all rights reserved); Wed Jan 23 06:04:54 EST 2019Downloaded/printed byEge Universitesi Izmir (Ege Universitesi Izmir) pursuant to License Agreement. No further reproductions authorized. E466 15

Once a technique has been established and approved for a specic test program, changes should not be made because of potential bias that may be introduced by the changed technique. Any change in the force train conguration during the test program from that already shown to provide acceptable alignment necessitates a repeated measurement of the bending stresses (strains). The bending stresses (strains) so determined on either the cylindrical or rectangular cross section specimen shall not exceed 5 % of either the range, maximum or minimum stresses (strains) imposed during the test, or 6100 microstrain, whichever is greater. Bending stresses (strains) shall be calculated using the method of Practice E1012, Section 10 (Calculation and Interpretation of Results). Alignment verication is required if the force train is changed. If there are no changes to the force train, then alignment verication is to be performed at least every 12 months.

7. Equipment Characteristics 7.1 Generally, the tests will be performed on one of the following types of fatigue testing machines: 7.1.1 Mechanical (eccentric crank, power screws, rotating masses), 7.1.2 Electromechanical or magnetically driven, or 7.1.3 Hydraulic or electrohydraulic. 7.2 The action of the machine should be analyzed to ensure that the desired form and magnitude of loading is maintained for the duration of the test.