This test method details the standard procedures for determining the flexural strength of manufactured carbon and graphite articles using a simple beam in four-point loading at room temperature. The four-point loading fixture shall consist of spherical bearing blocks of hardened steel or its equivalent to ensure that forces applied to the beam are normal only and without eccentricity, and distortion of the loading member is prevented. Judicious use of linkages, rocker bearings, and flexure plates may maintain the parallel direction of loads and reactions. The test specimens shall be prepared to yield a parallelepiped with cross sections that are rectangular, faces that are parallel and flat, and edges that are free from visible flaws and chips.
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Significance and Use
4.1 This test method may be used for material development, quality control, characterization, and design data generation purposes.
4.2 This test method determines the maximum loading on a graphite specimen with simple beam geometry in 4–point bending, and it provides a means for the calculation of flexural strength at ambient temperature and environmental conditions.
1.1 This test method covers determination of the flexural strength of manufactured carbon and graphite articles using a simple beam in four-point loading at room temperature.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
C78 Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading)
C709 Terminology Relating to Manufactured Carbon and Graphite
C1161 Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature
E4 Practices for Force Verification of Testing Machines
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
carbon; flexural strength; graphite; Carbon; Flexural testing; Graphite; Graphite electrodes; Modulus of rupture (MOR) ;
ICS Number Code 71.100.99 (Other products of the chemical industry)
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