Element helps material manufacturers and product designers in the aerospace, automotive, and renewable energy sectors to evaluate material properties in flexural mode by providing three-point and four-point bend testing.

Flexural Test for Composites

Bend testing in composite materials is used to determine flexural strength and stiffness of a solid laminate or sandwich construction.

The specimen is loaded in a horizontal position in a three-point or four-point loading configuration in a flexural test. The test fixture has a support point near each edge of the beam and a loading nose with one (third-point loading) or two (four-point loading) configurations.

The distance between supports, and the loading points in the four-point configuration, can be easily modified to adapt the fixture to different specimen geometries and thickness-to-length ratios. 

Flexural is a combination of three properties:

  • Tensile 
  • Compression
  • Shear

The specimen in flexure will fail once one of the three basic stresses reaches its limiting value. The test result can help to understand the failure mode of a given geometry and loading configuration.


ASTM standards for Flexural Testing

Element test to EN, ISO, and ASTM standards for flexural testing of composite materials. The ASTM standards include:

  • ASTM D6272 - Flexural Test Composites Four-Point Bending
  • ASTM D7264 - Standard Test Method for Flexural Properties of Polymer Matrix Composite Materials
  • ASTM D790 - Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials Three-Point Bending
  • ASTM C393 - Flexural Properties of Sandwich Constructions
  • ASTM D7249 - Facing Properties of Sandwich Constructions by Long Beam Flexure

The Element advantage in Flexural Testing of Composites

Element’s experts provide Testing to ASTM, ISO, and EN standards for solid laminates and sandwich constructions to ensure the materials and products we test are safe and fit-for-purpose.

Get in touch for further information flexural testing of composite materials.

Solid laminates:

  • ASTM D790
  • ASTM D6272
  • ASTM D7264
  • EN 2562
  • ISO 178
  • ISO 14125

Sandwich constructions:

  • ASTM C393
  • ASTM D7249

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