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Combined Loading

Combined Loading

This procedure is suitable for the testing of fiber composites under the higher loads that occur with larger specimen cross-sections. Part of the compressive force is loaded via the specimen clamping, the rest on the ends of the specimen. The length of the specimen is matched precisely to the length of the jaws. Very high requirements are placed on the processing of specimen ends, as in the end-loading procedure. 

ASTM D 6641 and procedure 2 according to ISO 14126 describe a mechanical testing tool comprising four elements connected to each other by guide columns. The clamping force is generated with 8 screws, which are tightened with a torque key. The test device with integrated specimen is placed between two compression plates in the testing machine for testing. 

An enhancement of the procedure was laid down in the Airbus standard AITM 1.0008 edition 2010, which describes both shear loading and combined loading. The application of clamping force is described as a hydraulic parallel clamping principle. Studies showed that more valid break images are achieved when clamping peaks at the transition between free clamping length and clamping area are avoided by the structural design of the jaws. In the Airbus standard, this is described as "soft load introduction". 

The HCCF test device that meets the requirements of AITM 1.0008. It was tested and approved in this regard by Airbus in Bremen.

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