3-Point and 4-Point Bending Fixtures for Uniform Moment Flexural Testing

Description

3-point and 4-point flexural fixtures are used with universal testing machines to evaluate the bending properties of materials under controlled loading conditions. In a 4-point configuration, two loading rollers apply force at equal distances from the supports, producing a constant moment region between the load points. This method is used to measure flexural modulus and deformation behavior with as little effect from shear loading in the middle section as possible.

These fixtures are suitable for brittle materials, plastics, composites, and concrete beams where even stress distribution is important. Common reference standards include ASTM D6272 for plastics and ASTM C78 for concrete flexural testing.

The fixture assembly includes two upper loading rollers and two adjustable lower supports. The support span can be set to match specimen size and testing requirements. These flexural fixtures are used in construction material testing, composite manufacturing, and research environments to study bending performance and fracture characteristics under stable and repeatable loading conditions.

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