AHM E8/E8M – 13a. G–Gauge length. Dimensions, mm [in.] For Test Specimens with Gauge Length Four times the Diameter (E8]. Standard. Small-Size. Buy ASTM E 8/E8M: A TEST METHODS FOR TENSION TESTING OF METALLIC MATERIALS from SAI Global. Originally contact ASTM Customer Service at [email protected] For Annual Book of ASTM approved in Last previous edition approved as E8/ E8M.
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The gauge length is the most significant difference between E8 and E8M test specimens. Extensometers shall be used and verified to include the strains corresponding to the yield strength and elongation at fracture if determined.
The values stated in each system are not exact equivalents; therefore each system must be used independently of the other. When liners are used behind the wedges, they must be of the same thickness and their faces must be flat and parallel.
ASTM E8.E8M -15-Tensiont testing of metallic materials
Both of these gripping devices should be attached to the heads of the testing machine through properly lubricated sphericalseated bearings. For best results, the wedges should be supported over their entire lengths by the heads of the testing machine. NOTE 1—The effect of this eccentric force application may be illustrated by calculating the bending moment and stress thus added. This information may be useful in comparisons of materials, alloy development, quality control, and design under certain atm.
C39M – 16 – Compressive Strength of Cylindrical The e8mm used in determining tensile strength and yield strength shall be within the verified force application range of the testing machine as defined in Practices E4. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
This requires that liners of several thicknesses be available to cover the range of specimen thickness. If, however, for any reason, one grip of a pair advances farther than the other as the grips tighten, an undesirable bending stress may be introduced.
Aetm 1 de 8 Designation: A number in parentheses indicates the year of last reapproval. To ensure axial tensile stress within the gauge length, the axis of the test specimen should coincide with the center line of the heads of the testing machine. For measuring elongation at fracture with an appropriate extensometer, the gauge length of the extensometer shall be equal to the nominal f8m length required for the specimen being tested.
No further reproductions authorized. Any departure from this requirement may introduce bending stresses that are not included in the usual stress computation force divided by cross-sectional area.
ASTM E8.E8M Tensiont testing of metallic materials –
Proper alignment of wedge grips and liners is illustrated in Fig. NOTE 3—Punching or blanking qstm the reduced section may produce significant cold work or shear burrs, or both, along the edges which should be removed by machining. For a standard Originally approved in Astm a Astm a Brittle Materials—A schematic diagram of a gripping device for threaded-end specimens is ashm in Fig. These wedge grips generally furnish a satisfactory means of gripping long specimens of ductile metal.
This error increases to 2. The distance between spherical bearings should be as great as feasible. E8M Tensiont testing of metallic materials Juliano row Enviado por: For this reason, a small taper is permitted in the reduced section of each of the specimens described in the following atsm. Astm c astm normas fibra de vidrio.
Combining values from the two systems may result in non-conformance with the standard. A superscript epsilon indicates an editorial change since the last revision or reapproval. It is important, therefore, that care be exercised in the preparation of specimens, particularly ee8 the machining, to maximize precision and minimize bias in test results. For proper gripping, it is desirable that the entire length of the serrated face of each wedge be aastm contact with the specimen. Such interpretation is usually applicable to values for reduction of area reported in the literature when no further qualification is given.
The test methods have been used extensively in the trade for this purpose. Current edition approved May 1, For short specimens and for specimens of many materials it is generally necessary to use machined test specimens and to use a special means of gripping to ensure that the specimens, when under w8, shall be as nearly as possible in uniformly distributed pure axial tension see 5.