ASTM C651 determines the flexural strength of manufactured carbon and graphite articles using a simple beam in four-point loading at room temperature. TestResources provides machines, grips, equipment, and fixtures for testing in accordance with ASTM C651.

A TestResources Electromechanical Universal Testing Machine can be used to measure the flexural strength of carbon graphite. A special four-point loading fixture is also provided that consists of bearing blocks which ensure that forces applied to the beam are normal only and without eccentricity. The bearing block diameter shall be between 1/10 and 1/20 of the specimen support span.

A hardened steel bearing block or its equivalent is necessary to prevent distortion of the loading member. The directions of loads and reactions may be maintained parallel by judicious use of linkages, rocker bearings, and flexure plates. The eccentricity of loading can be avoided by the use of spherical bearings. Provision must be made in fixture design for relief of torsional loading to less than 5 % of the nominal specimen strength.

By means of our flexural strength testing expertise and modular product design, we will help find the testing solution that is right for you. Give one of our application engineers a call today for help with creating the best budget and testing plan according to ASTM C651.

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