Bending Fixtures for Standard 3-Point Flexural Testing

Description

Bending fixtures, also referred to as flexural test fixtures, are used with universal testing machines to carry out 3-point and 4-point bend tests. These tests are performed to evaluate flexural strength, modulus of elasticity, and related bending properties in plastics, metals, wood, and composite materials.

A typical setup includes two lower support anvils and one or two upper loading noses or rollers. The span length can be adjusted to suit the specimen dimensions and geometry. These fixtures are commonly applied in testing procedures such as ASTM D790 for plastics and ASTM C393 for sandwich panel structures. The fixture layout supports stable alignment and reduces unwanted friction during loading.

Bending fixtures are used in manufacturing, research, and laboratory environments to create controlled flexural loading conditions. They are produced from rigid steel or aluminum to maintain shape under load, helping the applied force transfer directly through the specimen during the test.

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