Beter Julia, Schrittesser Bernd, Meier Gerald, Lechner Bernhard, Mansouri Mohammad, Fuchs Peter Filipp, Pinter Gerald
Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700 Leoben, Austria.
Department of Polymer Engineering and Science, Montanuniversitaet Leoben, Otto Gloeckelstrasse 2, 8700 Leoben, Austria.
Polymers (Basel). 2020 Nov 24;12(12):2780. doi: 10.3390/polym12122780.
The focus of this research is to quantify the effect of load-coupling mechanisms in anisotropic composites with distinct flexibility. In this context, the study aims to realize a novel testing device to investigate tension-twist coupling effects. This test setup includes a modified gripping system to handle composites with stiff fibers but hyperelastic elastomeric matrices. The verification was done with a special test plan considering a glass textile as reinforcing with different lay-ups to analyze the number of layers and the influence of various fiber orientations onto the load-coupled properties. The results demonstrated that the tension-twist coupling effect strongly depends on both the fiber orientation and the considered reinforcing structure. This enables twisting angles up to 25° with corresponding torque of about 82.3 Nmm, which is even achievable for small lay-ups with 30°/60° oriented composites with distinct asymmetric deformation. For lay-ups with ±45° oriented composites revealing a symmetric deformation lead, as expected, no tension-twist coupling effect was seen. Overall, these findings reveal that the described novel test device provides the basis for an adequate and reliable determination of the load-coupled material properties between stiff fibers and hyperelastic matrices.
本研究的重点是量化具有不同柔韧性的各向异性复合材料中载荷耦合机制的影响。在此背景下，该研究旨在实现一种新型测试装置，以研究拉伸-扭转耦合效应。该测试装置包括一个经过改进的夹持系统，用于处理具有刚性纤维但超弹性弹性体基体的复合材料。通过一个特殊的测试方案进行验证，该方案以玻璃织物作为增强材料，采用不同的铺层方式，以分析层数以及各种纤维取向对载荷耦合性能的影响。结果表明，拉伸-扭转耦合效应强烈依赖于纤维取向和所考虑的增强结构。这使得扭转角度可达25°，相应扭矩约为82.3 Nmm，对于具有明显不对称变形的30°/60°取向的小铺层复合材料甚至也能实现。对于具有±45°取向复合材料且呈现对称变形的铺层，如预期的那样，未观察到拉伸-扭转耦合效应。总体而言，这些发现表明，所描述的新型测试装置为充分且可靠地测定刚性纤维与超弹性基体之间的载荷耦合材料性能提供了基础。
