Testing device 3-point bending test
Bending device for 3-point bending tests
Testing device 3-point bending test
3-point bending device
Supports for bending devices
Tiltable supports with round or rectangular support surfaces
Supports for bending devices
Supports with ball bearings and rotatable supports
Testing tool bending tests
3-point bending device with compensator as a holder for measuring probes
Test device for folding tests
3-point folding test according to DVS 2203 part 5
Testing tool 4-point bending test
4-point bending test according to DIN EN 789 and DIN EN 310 with 1 measuring probe

Bending devices and folding devices

Flexure test kits for 3- and 4-point bending tests and folding tests

Applications for bending devices and folding devices:

  • Determination of material properties of brittle composites, ceramics, metals, wooden panels, rigid plastics 
  • Analysis of welded sheets

For the selection of a bending device, various criteria have to be considered based on the test procedures and the standard specification:

  • Procedure: 3-point or 4-point bending test or folding test
  • Rigid, rotatable or tiltable bending fin and supports
  • Dimensions & spacing of supports and fin
  • Material, hardness
  • Maximum bending force
  • Accuracy of deflection
  • Possible risks in case of breakage

Bending test and folding test methods

3-point bending test

  • Simple test set-up for a variety of test methods
  • Especially used for elastic materials

Folding test

  • Deformation always up to the plastic range

4-point bending test

  • Constant bending moment between both support points (shear force-free area)
  • Used mainly to determine the flexural modulus of elasticity of brittle materials.

Options for the supports and bending fins of bending devices

  • Bearing can be swivelled, tilted and fixed → Purpose: avoidance of transverse loads with non-symmetrical specimens
  • Different bearing surfaces and radii at the bending edges

Bearing distances

  • Mostly specified by test standard / specimen dimensions.
  • The adjustment of the support distances is carried out either via screws or via a crank. The distances can be read off with millimetre precision using an applied scale.

Determination of the deflection in bending tests

Measuring probe/control probe

  • For accurate measurement of deflection

Support with angle sensors

  • Direct determination of the bending angle via angle sensors on both supports, e.g. according to DIN EN 12814-1

Safety equipment for bending devices

  • Safety enclosure of the bending device: especially for testing ceramics
  • Safety door over the entire test area
4-point bending test on sandwich panels according to ASTM C393.

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