Find the most up-to-date version of ASTM F at Engineering ASTM C & F TESTING FIXTURE. CERAMIC EQUIBIAXIAL FLEXURAL STRENGTH. 1. ASTM F TESTING FIXTURE. A ring supports thin circular. Test machines and fixtures for ASTM F testing standard.

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For ASTM F, take a thin circular disk specimen of the ceramic and rest it on three symmetrically spaced points near its periphery. This fixture, assembled and disassembled, is shown in Figs. Equipment Needed TestResources provides Electromechanical Compresion Test Machines mounted with biaxial flexure fixtures to precisely test your thin ceramic material. In order to attain a uniform load distribution, either the specimen surfaces must be asttm flat typically by surface grindingor a relatively thick one-half the specimen thickness sheet of a compliant material e.

Specimen warpage is also a problem awtm flexural testing a straight beam Reference 4requiring an articulating test fixture. Wyoming Test Fixtures Inc.

One important advantage of this biaxial test configuration is that specimen warpage is not an influencing factor, as opposed to the ring-on-ring test ASTM C This is not the case when flexural testing a straight beam. Sources of Additional Information: Thus, the surface finish of the edge of the specimen is astk critical.


Many turn to testing standards such as ASTM F to determine the modulus of rupture for their thin ceramic materials. The dimensions and elastic contents of the specimen, breaking load, and the radii of the support and load are used to calculate the maximum tensile stress which is at the center of the tension convex surface.

A compressive loading is applied at the center of the disk specimen by a 0.

ASTM F Modulus of Rupture of Ceramic Substrate

Both biaxial test methods have an advantage relative to a flexural test of a straight beam in that the maximum biaxial tensile stress occurs at the center of the specimen on the lower convex when deflected side. The specimen will be bent in a cupping fashion by a test machine applying force to the center of the disk through a cylindrical ram. The minimum thickness of the specimen must be such that its center deflection at failure does not exceed one-half the specimen thickness.

As another aid to achieve uniform loading, the loading head is articulated, being supported on a spherical seat. The force is applied to the ram at a constant rate in a compression test machine until the specimen breaks.


Site designed for Internet Explorer 5. The required diameters of the support and loading ring are dependent on the thickness and material properties of the specimen being tested.


This testing method provides a calculation of biaxial flexure strength for specimens in the as-fired condition or to test pieces prepared to atm a certain thickness or surface finish. It utilizes the same type of fixture, but specifies a specific size, namely, a 30mm support ring, a 12mm loading ring, and a 2mm cross-sectional radius of the rings.

The standard gives expressions for calculating these parameters. The test fixture is shown in Fig. In spite of these uniform load introduction concerns, this test method is gaining in popularity.

TestResources provides Electromechanical Compresion Test Machines mounted with biaxial flexure fixtures to precisely test your thin ceramic material.