Bending Fixtures for Standard 3-Point Flexural Testing

Bending fixtures, also called flexural test fixtures, are used with universal testing machines to run 3-point and 4-point bend tests. They evaluate flexural strength, modulus of elasticity, and related bending behavior.

In a flexural test, the specimen is supported near its ends and loaded in the middle so it bends, which reveals how the material carries a bending load.

This makes them a core fixture for materials that see bending in service. To match a set to your work, request a personal quote.

Flexural fixtures cover a broad range of materials:

• Plastics
• Metals
• Wood
• Composites

Each of these has published flexural methods, so one fixture family covers many programs. Explore the full grips and fixtures range.

A 3-point test applies load through a single nose, so the maximum stress is concentrated on one line at mid-span. A 4-point test uses two loading noses, which spreads the load and creates a region of constant bending moment between them.

3-point is simpler; 4-point gives a more uniform stress region for sensitive materials. To choose the right one, talk to our team.

A typical 3-point setup uses two lower support anvils and a single upper loading nose or roller. The specimen rests on the two supports while the nose applies force at mid-span. The maximum bending stress falls directly under that loading nose, which is why the 3-point test is simple and widely used.

Its straightforward geometry makes it the default for routine flexural work. Learn more about our tensile testing equipment.

The right choice depends on a few factors:

• The material and its standard, such as ASTM D790
• The specimen size, which sets the span
• Whether a 3-point or 4-point configuration is required

Those point to the fixture and span you need. Email sales@tensilemillcnc.com.

Yes. The span length can be adjusted to suit the specimen dimensions and geometry. The span is an important test parameter, since it sets the span-to-depth ratio that many flexural standards specify.

Matching the span to the standard is key to a valid result. To set up a bend test, request a personal quote.

They are commonly used for methods such as ASTM D790 for plastics and ASTM C393 for sandwich panel structures. ASTM D790 covers the flexural properties of unreinforced and reinforced plastics, while C393 addresses sandwich constructions.

The fixture is matched to the specific standard and specimen. See our standards and certification.

Flexural tests measure flexural strength, modulus of elasticity, and related bending properties. Flexural modulus describes the material’s stiffness in bending, while flexural strength, sometimes called modulus of rupture, is the stress the specimen reaches at failure.

Together they describe how stiff a material is and how much bending it can take. Learn more about our tensile testing equipment.

Yes. Sandwich panel structures are covered by methods such as ASTM C393, using a flexural setup suited to the panel’s core and facings. The fixture supports the panel so the bending load is applied correctly.

This extends flexural testing to engineered sandwich constructions. To set up a panel test, request a personal quote.

The fixture layout supports stable alignment and reduces unwanted friction, typically by using rollers at the supports and loading nose so the specimen can move slightly as it bends. This keeps the measured load driven by the material rather than friction.

Reducing friction is what keeps flexural data accurate. Explore the full grips and fixtures range.

They are produced from rigid steel or aluminum so they maintain their shape under load. A rigid fixture ensures the applied force transfers directly through the specimen rather than being lost to fixture deflection.

Rigidity is essential for repeatable flexural results. Learn more about our tensile testing equipment.

They are used in manufacturing, research, and laboratory environments to create controlled flexural loading conditions. Anywhere bending performance matters, from plastics to structural materials, they provide a repeatable setup.

Consistent loading is what makes flexural results comparable. Explore the full grips and fixtures range.

You can request a personal quote or order online. Sharing your material, standard, and specimen size lets us recommend the right fixture and span.

For a configuration matched to your testing, request a personal quote.