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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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 adtm, when under load, shall be as nearly as possible in uniformly distributed pure axial tension see 5. Both of these gripping devices should be attached to the heads of the testing machine through properly lubricated sphericalseated bearings.
The test methods have been used extensively in the trade for this purpose. These wedge grips generally furnish a satisfactory means r8m gripping long specimens of ductile metal.
Such interpretation is usually applicable to values for reduction of area reported in the literature when no further qualification is given. Parte 1 de 8 Designation: 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.
It is important, therefore, that care xstm exercised in the preparation of specimens, particularly in the machining, to maximize precision and minimize bias in test results. A number in parentheses indicates the year of last asrm.
For measuring elongation at fracture with an appropriate extensometer, the gauge length of the extensometer shall be equal to the nominal gauge length required for the specimen being tested. 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. Originally approved in For this reason, a small taper is permitted in the reduced section of each of the specimens described in the following sections.
ASTM E8 / E8M – 13 Standard Test Methods for Tension Testing of Metallic Materials
A superscript epsilon indicates an editorial change since the last revision or reapproval. This information may be useful in comparisons of materials, e8j development, quality control, and design under certain circumstances.
Proper alignment of wedge grips and liners is illustrated in Fig. Combining values from the two systems may result in non-conformance with the standard.
This requires that liners of several thicknesses be available to cover the range of specimen thickness. The forces 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.
Brittle Materials—A schematic diagram of a gripping device for threaded-end specimens is shown in Fig. For a standard Current edition approved May 1, Astm a Astm a For best results, the wedges should be supported over their entire lengths by the heads of the testing machine. E8M Tensiont testing of metallic materials Juliano row Enviado por: NOTE 3—Punching or blanking of the reduced section may produce significant cold work or shear burrs, or both, along the edges which should be removed by machining.
This error increases to 2. The gauge length is the most significant difference between E8 and E8M test specimens.
ASTM E8.E8M -15-Tensiont testing of metallic materials
C39M – 16 – Compressive Strength of Cylindrical NOTE asm effect of this eccentric force application may be illustrated by calculating the bending moment and stress thus added. 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.
No further reproductions authorized. Astm c astm normas fibra de vidrio. When liners are used behind the wedges, they must be of the same thickness and their faces must be flat and parallel. The distance between spherical bearings should be as great as feasible.
For proper gripping, it is desirable that the entire length of the serrated face of each wedge be in contact with the specimen. Extensometers shall be used and verified to include the strains corresponding to the yield strength and elongation at fracture if determined. Any departure from this requirement may introduce bending stresses that are not included in the usual stress computation force divided by cross-sectional area.