The biaxial bending test fixture meets the standard

The biaxial bending test fixture meets the standardThe biaxial bending test fixture meets the standard

Double axis bending test fixture - GB30367-2025

The biaxial bending test fixture is used in GB 30367-2025 standard to determine the biaxial bending strength of dental ceramic materials, using the "piston three ball" test method (also known as the punch rod pressure three ball test).

The core structure and requirements of this fixture are as follows:

Support system: consisting of three hard steel balls with a diameter of (4.5 ± 2) mm, evenly distributed at a 120 ° angle within a support ring with a diameter of (11 ± 1) mm, serving as the support points for the specimen.

Loading method: The load is applied to the center of the specimen through a flat punch (piston) with a diameter of (1.4 ± 0.2) mm, ensuring that the stress is concentrated in the central area.

Sample placement: The sample should be placed concentric on three supporting balls to ensure loading symmetry and testing accuracy.

Uniformization of contact pressure: A non rigid material film (such as a 0.05 mm thick polyethylene film) should be placed between the supporting ball and the specimen, and between the specimen and the loading head, to evenly distribute the contact pressure and reduce local stress concentration.

Experimental equipment coordination: It needs to be used in conjunction with a universal mechanical testing machine, with a crosshead speed set at (1 ± 0.5) mm/min, and a load measurement accuracy of ± 0.1 N.

The biaxial bending test fixture is used in GB 30367-2025 standard to determine the biaxial bending strength of dental ceramic materials, using the "piston three ball" test method (also known as the punch rod pressure three ball test).

The core structure and requirements of this fixture are as follows:

Support system: consisting of three hard steel balls with a diameter of (4.5 ± 2) mm, evenly distributed at a 120 ° angle within a support ring with a diameter of (11 ± 1) mm, serving as the support points for the specimen.

Loading method: The load is applied to the center of the specimen through a flat punch (piston) with a diameter of (1.4 ± 0.2) mm, ensuring that the stress is concentrated in the central area.

Sample placement: The sample should be placed concentric on three supporting balls to ensure loading symmetry and testing accuracy.

Uniformization of contact pressure: A non rigid material film (such as a 0.05 mm thick polyethylene film) should be placed between the supporting ball and the specimen, and between the specimen and the loading head, to evenly distribute the contact pressure and reduce local stress concentration.

Experimental equipment coordination: It needs to be used in conjunction with a universal mechanical testing machine, with a crosshead speed set at (1 ± 0.5) mm/min, and a load measurement accuracy of ± 0.1 N.