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A fixture with a hydraulically operated specimen grip has been developed by Zwick, with the intention of offering technical and economic advantages compared to existing mechanical jigs.
According to Zwick, simplification of the handling and loading of specimen into the fixture significantly reduces the testing time, with handling and alignment errors virtually eliminated.
The new Hydraulic Composite Compression Fixture (HCCF) was developed and patented by the IMA Material Research and Application Technology in Dresden and is used specifically for the testing of carbon-fibre-reinforced plastics (CFRP) and glass-fibre-reinforced plastics (GFRP) with unidirectional fibre-reinforcement. It was primarily designed for determining compressive characteristics and is suited for testing standards such as prEN 2850, DIN EN ISO 14126, DIN 65380, and QVA-Z10-46-38.
The open C-frame construction facilitates the simple and fast exchange of specimens, and in addition the attachment of extension measurement systems can be easily carried out. Due to the design and construction, the specimen is very precisely aligned as tolerances due to the set-up in traditional jigs, especially with a wedge clamping principle, have been avoided. A specimen guidance system minimizes any measurement error and variance, and in addition the test results are largely unaffected by frictional forces, due to the use of friction free ball guides, in the fixture.
The hydraulic clamping force mechanism guaranties a reliable and reproducible clamping of the specimens and the clamping force is applied uniformly and securely across the specimen. As a result the specimens are not subject to misalignment, eccentric forces, or slippage.
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