3-point bending test according to DIN EN 2563 | Interlaminar shear strength
Short bending test for fiber-reinforced composites
The 3-point bending test according to DIN EN 2563 / ASTM D 2344 is used to determine the interlaminar shear strength (ILSF) of fiber-reinforced composite materials. Since the bending test is relatively short, it is called a short bending test (SBS). This test is typically carried out on unidirectional samples made of carbon fiber-reinforced plastics for the aviation industry. The shear strength determined corresponds to the maximum shear stress when the neutral fibers of the test specimen are damaged. The interlaminar shear stress is determined parallel to the laminate layers in order to obtain a qualification of the fiber and matrix connection. The tests of the above-mentioned standards are similar in their implementation and test setup, but differ in the test specimen geometry, the test speed and the test tool.
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Application Notes Interlaminar Shear Test
| purpose of the experiment | Proof of composite plastic/resin à carbon fiber reinforcement |
| test equipment | universal testing machine grade 1 Load cell ~ 2,5 kN or larger (max. 25 kN) |
| sample preparation | sawing, milling |
| TH238 | 3-point bending device DIN EN 2563. |
| tool dimension | Support R3 | Fin R3 mm | Support distance 10 (+/- 0,1) mm |
| Speed | 1mm/minute |
| sample geometry | L xwxd: 20 (+ 0.25) x 10 (+ 0.2) x 2 (+ 0.2) ASTM D 2344 |
| tool dimension | Support R1,6 mm | Fin R3,2 mm | Support distance 8 mm |
| Speed | 1.0mm/minute |
| sample geometry | L/b/d (1): 25mm x 6.4mm x 2mm |
| ILSF | = MPa apparent shear strength |
| Fm | = Maximum compressive force Newton |
| B | = measured sample width (1) |
| d | = measured sample thickness (1) |
| L | = length of the sample (1) |
Formula EN 2563 / ASTM D 2344 interlaminar shear strength ILSF
The formula for calculating shear strength is an integral part of the GALDABINI testing software and does not need to be created separately (via the also integrated formula editor).
