IITRI Compression Fixture to ASTM D-3410
S4690A | IITRI Compression Fixture to ASTM D-3410
Fabricated from high strength stainless steel with stainless steel bearings.
Jaw faces have flame sprayed high friction surface.
Max. Static Load: 300 kN (30,000 kgf, 67,000 lbf).
Upper Interface: For loads of up to 100 kN Type Dm (1.25 in connection with 1/2 in clevis pin) - this is included for ease of use on 100 kN (maximum) EM systems. Higher forces require a compression platen with a minimum diameter of 100 mm (4 in). A platen with a lockable spherical seat is recommended to ensure parallelism.
Lower Interface: Requires a compression platen with a minimum diameter of 100 mm (4 in).
Platens not included.
Specimen width: 12 to 38.1 mm (0.5 to 1.5 in)
Specimen thickness: 1 to 15 mm (0.04 to 0.59 in)
Temperature range: -70 to +200 °C (-94 to +392 °F)
Includes wedges for specimen up to 15 mm (0.59 in) thick.
Includes specimen alignment jig to facilitate accurate specimen assembly.
Includes storage case.
|Gamme de températures||°C °F)|
Compression testing of composites without anti-buckling guide plates, is often preferred as the free unsupported length is more representative of true compression behavior. This method relies on the accuracy of the alignment between the upper fixture and the lower fixture while introducing the compression load. In addition, the natural failure process of the specimen will induce high lateral forces that must be resisted to ensure that forces remain in true compression. Therefore, the principle behind the IITRI, Wyoming Modified Celanese and Combined Loading Compression fixtures is essentially the same. Where they are different, is the way the compression load is being introduced – either by shear transfer from jaw faces to specimen, or a combination of shear and end loading. This is the primary difference with the CLC fixture where the shear load component is from the tightening of the screws which is combined with end loads introduced directly. The IITRI and Celanese rely on the self tightening effect from the wedge jaw faces. The Celanese fixture also allows for preloading the jaw faces by manual screws when the specimen is being installed, while the IITRI also includes end bars that could be used to introduce end loads to the specimen. In terms of usability, the IITRI allows the largest specimens, up to 38 mm wide, but is the heaviest of the fixtures. The CLC is conceptually the simplest but care must be exercised to ensure the specimen is properly located and improper or uneven tightening of the clamping screws can affect results. The Celanese is a neat compact fixture but is limited to only 12.7 mm (0.5 in.) wide specimens.
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