DIN EN ISO 14125 Test Fixture

Flexural properties are essential for understanding the mechanical behavior of fiber-reinforced polymer matrix composites under bending loads. This fixture, designed in accordance with DIN EN ISO 14125, provides a standardized method for determining the flexural properties of composite materials using a three-point bending test. The fixture ensures accurate specimen preparation and support, allowing for precise measurement of flexural strength, flexural modulus, and other related properties. This information is crucial for evaluating the performance of composite materials in various applications, ensuring their suitability for structural and load-bearing applications where bending stresses are prevalent, and contributing to the overall safety and reliability of composite structures.

Sample Length: 10-200mm (adjustable)

Sample Width: 0-100mm

Radius of punch: Standard 5mm, other customized like 1, 2, 3, 4, 5, 6, 6.35, 8, 10, 12, and 12.7mm

Radius of supports: Standard 5mm, other customized.

Adapter Couping: 40mm female clevis with 12/16/20mm locking pin

The ISO 14125 flexural testing methods

The ISO 14125 bend testing standard is based on ISO 178, but was established with fiber-reinforced plastic composites in mind.  

It retains the test conditions relevant for glass-reinforced systems and it’s extended to include both three-point, and four-point, loading geometries. It’s also suitable for flexural strength testing for composites based on newer fibers such as carbon and aramid fibers. 

Other source documents consulted include ASTM D790 (four-point loading). The overall specimen length for four-point loading is the same as for three-point loading. The method is not suitable for determining design parameters, but may be used for screening materials, or as a quality-control test. 

ISO 14125 flex testing samples

The samples you test for the ISO 14125 flex testing method may be molded to the chosen dimensions, machined from the central portion of the standard multi-purpose test specimen. They can also be machined from semi-finished, or finished, products such as moldings or laminates. 

The ISO 14125 plastic test specifies preferred dimensions for the specimen. Tests on specimens of other dimensions, or prepared under different conditions, may produce incomparable results. Other influencing factors to consider include the speed of testing and the conditioning of the specimens.  

Sample Length: 10-200mm (adjustable)

Sample Width: 0-100mm

Radius of punch: Standard 5mm, other customized like 1, 2, 3, 4, 5, 6, 6.35, 8, 10, 12, and 12.7mm

Radius of supports: Standard 5mm, other customized.

Adapter Couping: 40mm female clevis with 12/16/20mm locking pin