The preliminary experiments for our previously announced test series investigating the failure behavior of polymer composites under multiaxial loading conditions have been successfully completed. The results are very encouraging: the test specimens failed at the desired location, within the gauge area, and followed the expected fracture mechanism. The testing of the direct optical strain measurement system (digital image correlation method) was also successful, validating its applicability for this purpose. The custom-designed gripping fixtures we developed also functioned as intended.

Before finalizing the production of the final prototypes, the models underwent virtual optimization through ANSYS mechanical simulations.

However, the most exciting results we expected were the failure load state of the composite tubes. These were compared to our preliminary estimates conducted directly within the ANSYS ACP module. The image below shows the theoretical estimate as the dashed line, while the symbols represent the outcome of the preliminary measurement for a combined tensile-torsional test of a 90° oriented tube. The close alignment of these results is promising for the future.

Currently, the final preparations for the measurements are underway. We expect to share the final results within a few weeks.

We would like to thank the Mechanical Materials Testing Laboratory of the Bay Zoltán Nonprofit Ltd. for Applied Research for their expert support in successfully carrying out these measurements.