ASTM C565-15 (R2021) pdf free download.Standard Test Methods for Tension Testing of Carbon and Graphite Mechanical Materials.
1.1 These test methods cover the apparatus. specimen. and procedures for the tension testing of carbon and graphite mechanical materials with a grain size smaller than 0.79 mm.
1.2 The values stated in SI units are to he regarded as standard. No other units of measurement are included in this standard.
1.2.1 Exception—All of the figures are dimensioned in inches in accordance with the original standard.
3. 1 .2 tensile strength, n—property of solid material that indicates its ability to withstand a uniaxial tensile load, converted to unit stress based on the original cross-section area of the tensile test specimen.
3. 1 .3 ultimate tensile strength, n—the maximum tensile stress applied in stretching a specimen to rupture.
4. Significance and Use
4.1 These test methods may be used for quality control testing of established grades of carbon and graphite materials, in the development of new grades. and for other purposes where relative strength levels are the primary quantities of interest. This test method may be applicable only if the ratio of specimen diameter to grain size, or flaw size, is greater than 5.
4.2 These test methods do not substitute for that described in Test Method C749, but are useful where less sophisticated data and less expensive techniques are sufficient.
4.3 Carbon and graphite materials exhibit significant physical property differences within parent materials. Exact sampling patterns and grain orientations must be specified in order to make meaningful tensile strength comparisons.
5. Apparatus
5.1 Testing Machine—The machine used for tension testing shall conform to the requirements of Practices E4. The testing machine shall have a capacity that the breaking load of the test specimen falls between 10 % and 90 % of the scale capacity.
5.2 Gripping Devices—Gripping devices that conform to the principles of those illustrated in Fig. I shall be used (dimensions that reflect the use of SI units are permissible). These gripping devices shall be attached to the heads of the testing machine through chain connectors. Fig. 2 shows the gripping device connected to the heads. Extreme care shall be taken that the axis of the test specimen is located on the center line of the head of the testing machine
6. Test Specimens
6.1 Test specimens shall be produced to the configuration shown in Fig. 3.ASTM C565 pdf download.