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Products » Testing Accessories » Application Specific Fixtures » Composite » Fixtures » Wyoming Compression Fixture

Wyoming Modified Celanese Compression Fixture

Application Specific Accessories

  • Composite
  • Fixtures
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2505-020_D
  • 2505-020_D
  • Description
  • Specifications
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CP105787 | Wyoming Modified Celanese Compression Fixture

University of Wyoming developed design based on the Celanese Compression Test fixture found in ASTM D 3410-1997.

Max. Static Load : 100kN (10,000 kgf, 22,000 lbf)

Maximum specimen width 12.7mm (0.5 in)

Specimen thickness (inclusive of end tabs) : 3.8 to 6.35mm (0.15 to 0.25 in)

Jaw face length : 50.8mm (2 in)

Fabricated from high strength stainless steel with stainless steel bearing.

Temperature range : -70 to +200 °C (-94 to +392 °F)

Includes 1 set of serrated jaw faces

Upper Interface: Requires compression platen diameter 100 mm (4 in) or larger. Lockable spherical seat recommended to ensure parallelism.

Lower Interface: Requires fixed compression platen diameter 100 mm (4 in) or larger.

Platens not included.

Includes storage case.

Accessory Height 142 mm (5.6 in)
Accessory Weight 5.3 kg (11.7 lb)
Accessory Width 75 mm (3 in)
Capacity 100 kN (20000 lbf)
Lower Fitting Requires platen 100 mm (4 in) or larger
Temperature Rating -70 to +200°C (-94 to +392°F)
Upper Fitting 0.5 in clevis pin (Type Dm) or optional platen 100 mm (4 in) or larger

Composites Compression Unsupported Gage Section

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.

  • Products
  • 8/25/2014
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