Marl Svenja, Ni Xiaofei, Hornig Tobias, Spieker Christian, Giesen Ralf-Urs, Heim Hans-Peter, Fister Michael
Institute for Materials Technology, University of Kassel, 34125 Kassel, Germany.
Institute for Drive and Vehicle Technology, University of Kassel, 34121 Kassel, Germany.
Materials (Basel). 2024 Aug 9;17(16):3961. doi: 10.3390/ma17163961.
The material parameters required to describe material behavior can change with the age of the components due to chemical and physical aging processes. The finite element method (FEM) is a tool for designing components for later use. The aim of this study is to correlate the change in the mechanical properties of silicone elastomers from standard tests over a longer period of time with the parameters of the Mooney-Rivlin model. To date, there are no publications on the development of the Mooney-Rivlin parameters of silicone elastomers over a storage period. For this purpose, the Shore A hardness, rebound elasticity, compression set and tensile properties were investigated over an aging period of approx. 200 days on two liquid silicone rubbers (LSRs) and one room-temperature-vulcanizing (RTV) silicone rubber. Depending on the silicone elastomer used, different trends in the characteristic values can be observed over the storage period. In general, increases in the Shore A hardness, rebound resilience and stress at a 100% strain with a decrease in the compression set can be determined. In addition to standard tensile tests, the material's multiaxial behavior under tension was probed, and it was found that the similarly stress at a 100% strain increased. Finite element simulations verified the standard tensile test and corresponding Mooney-Rivlin model parameters. These parameters from the uniaxial tensile were validated in the multiaxial behavior, and the model's accuracy in representing material properties and the influence of aging on the FEM simulation were affirmed.
由于化学和物理老化过程，描述材料行为所需的材料参数会随部件的使用年限而变化。有限元方法（FEM）是一种用于设计后续使用部件的工具。本研究的目的是将较长时间内标准测试中硅橡胶弹性体力学性能的变化与穆尼-里夫林模型的参数相关联。迄今为止，尚无关于硅橡胶弹性体在储存期内穆尼-里夫林参数变化的出版物。为此，对两种液态硅橡胶（LSR）和一种室温硫化（RTV）硅橡胶在约200天的老化期内进行了邵氏A硬度、回弹性、压缩永久变形和拉伸性能的研究。根据所使用的硅橡胶弹性体不同，在储存期内可观察到特征值的不同变化趋势。一般来说，可以确定邵氏A硬度、回弹性和100%应变时的应力增加，而压缩永久变形减小。除了标准拉伸试验外，还探测了材料在拉伸下的多轴行为，发现100%应变时的应力同样增加。有限元模拟验证了标准拉伸试验和相应的穆尼-里夫林模型参数。这些单轴拉伸得到的参数在多轴行为中得到了验证，并且该模型在表示材料性能方面的准确性以及老化对有限元模拟的影响得到了确认。
