Torggler Julian, Leitner Martin, Buzzi Christian, Faethe Tobias, Müller Heiko, Machado Charry Eduardo
Institute of Structural Durability and Railway Technology, Graz University of Technology, Inffeldgasse 25/D, 8010 Graz, Austria.
Siemens Mobility Austria GmbH, Eggenberger Straße 31, 8020 Graz, Austria.
Materials (Basel). 2024 Sep 28;17(19):4771. doi: 10.3390/ma17194771.
Cord-rubber composites are subjected to a wide range of loads in various applications. However, their fatigue behavior remains relatively under-researched. To address this gap, a set of representative specimens was developed, and a validated numerical model was employed to assess fatigue-relevant parameters. In this study, we present the results from two series of tests with different strain ratios ( values). One series was subjected to a pure pulsating tensile strain ( ~0), while the second series experienced an increased mean strain with an ratio between 0.2 and 0.3. A direct comparison of the two series demonstrated that a higher strain ratio results in a longer service life. This is reflected in an increase in the slope () from 13 to 23, as well as an increase in the ultimate fiber strain from 8% to 11% at = 50,000 load cycles for a survival probability of 50%. Both series indicate a comparable scatter in the test results. This comparative analysis shows that the strain ratio significantly impacts the fatigue behavior of cord-rubber composite materials based on cyclic tests under different loading conditions. The findings of this study demonstrate the necessity of considering different load situations when evaluating or designing components.
在各种应用中，帘线-橡胶复合材料会承受多种载荷。然而，它们的疲劳行为仍相对缺乏研究。为了填补这一空白，开发了一组具有代表性的试样，并采用经过验证的数值模型来评估与疲劳相关的参数。在本研究中，我们展示了两组不同应变比（值）试验的结果。一组承受纯脉动拉伸应变（~0），而另一组平均应变增加，应变比在0.2至0.3之间。两组试验的直接比较表明，较高的应变比会导致更长的使用寿命。这体现在斜率（）从13增加到23，以及在50,000次载荷循环、生存概率为50%时，极限纤维应变从8%增加到11%。两组试验结果的离散程度相当。这种对比分析表明，基于不同加载条件下的循环试验，应变比对帘线-橡胶复合材料的疲劳行为有显著影响。本研究结果表明，在评估或设计部件时考虑不同载荷情况的必要性。
