IITRI Compression Test Fixture GZ IT-50
The IITRI compression test fixture is used for the determination of characteristic material properties under compression load.
With this test fixture short, long or continuous fibre-reinforced thermosets or thermoplastics can be testet as well as unidirectional layers or fabrics, multi-layer structures and sandwich laminates. Even isotropic material, e.g. resin or glue, can be tested by use of this test fixture.
The test fixture is required for testing fibre-reinforced plastics to prevent the specimen from buckling. Compared to the Celanese compression test fixture GZ C-20, the IITRI test fixture has the advantage that both testing according to ASTM D3410 and DIN EN ISO 14126 or similar is possible. This means that specimens with a length of 110…160 mm and a width of 6…25 mm can be tested. According to the standards, the use of tabs is not absolutely necessary, but is recommended in order to avoid a too large stress jump between the clamping area and the free test surface and consequently clamping breaks. Strain gauges are applied on both sides in the middle of the specimen in order to determine compressive stiffness, elongation at break and buckling. The testing device consists of clamping wedges, which deflect the axial load of the testing machine into a transverse load for clamping the specimens according to the self-reinforcing principle.
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