GZ B-20

Bending test fixture for quasi-static tests

The innovative GZ B-20 bending test fixture enables all common bending tests on fibre-reinforced plastics to be carried out with just one test fixture. All support spans required for this can be flexibly adjusted with this test fixture. The principle of the bending test consists in the use of a two-part bending test fixture in which the specimen is clamped as a bending beam between two outer supports and loaded via an inner support (3-point bending) or two inner supports (4-point bending). For bending tests on fibre-reinforced plastics, the methods according to DIN EN ISO 14125, DIN EN ISO 178 and ASTM D790 are usually used. For this, a 3-point or 4-point load can be realised in the bending test.

By means of the various test methods for composites, the flexural strength and the flexural modulus are determined under a bending load of the test specimen at defined test conditions. The test is carried out at constant speed up to a specified deformation or until failure of the test specimen. As a result, the bending stress, the bending modulus and the elongation at failure are determined.

  • Compact test fixture for test loads up to max. 20 kN
  • Exchangeable support inserts for simple and quick adaptation of the test fixture to the respective test standard
  • Freely adjustable support distances
  • Precise centring of the specimen by lateral guides and setting gauge
  • Stainless steel design of all components for use in climatic chambers (-40...+150 °C)
  • Support inserts with all common radii (R = 2 mm, R = 3 mm, R = 5 mm) for various standards
  • Adapters for connection to all common electromechanical and servo-hydraulic testing machines
  • DIN EN ISO 14125, "Fibre-reinforced plastic composites - determination of flexural properties", DIN, 2011
  • ASTM D790, "Standard test methods for flexural properties of unreinforced and reinforced plastics and electrical insulating materials", ASTM, 2015
  • DIN EN ISO 178, "Plastics - determination of flexural properties", DIN, 2013
  • DIN EN 2562, "Aerospace series - carbon fibre reinforced plastics - unidirectional laminates; flexural test parallel to the fibre direction", DIN, 1997
  • DIN EN 2746, "Aerospace series - glass fibre reinforced plastics - flexural test, three point bend method", DIN, 1998
  • ASTM D7264, "Standard test method for flexural properties of polymer matrix composite materials", ASTM, 2015
  • ASTM D6272, "Standard test method for flexural properties of unreinforced and reinforced plastics and electrical insulating materials by four-point bending", ASTM, 2010