Compression Fixture Improves Composite Testing

Zwick Roell has introduced the hydraulic composites compression fixture (HCCF), which improves specimen handling, enables different specimen geometries to be tested and produces reproducible results. Found to deliver good results following tests carried out by a major European aircraft manufacturer in 2010, the HCCF was developed and patented by IMA Materialforschung und Anwendungstechnik in Dresden, Germany. It is produced and marketed by Zwick.

According to Zwick, the compression test is one of the most important tests performed on carbon-fibre composite materials. However, it can be a challenging test to perform accurately because introducing the load to the specimen is problematic and flexure and stress peaks can easily lead to erroneous test results. The new HCCF from Zwick is designed to eliminate these problems and give better control during tests. It enables shorter testing times, avoids errors and is very flexible, allowing different shapes of specimens to be tested. Compliant with the Airbus AITM 1-0008 industry standard, the HCCF can also be used for notch compression tests (OHC, FHC) to AITM 1-0008.

Versions that can be used at temperatures between -60C and +150C are also available. Zwick has also updated its Testxpert II software to include an expanded range of standard test programs for the composites industry. As well as producing suitable testing machines and fixtures, the company can now supply more than 40 standard test programmes for composites. Test programmes are available for all established types of test, such as tensile, compression, interlaminar shear strength, flexure, shear and so on, and all standards, such as ISO, EN, ASTM, Airbus AITM and Boeing BSS.

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