Zulkifli Nora Asyikin, Moon Geon Dae, Hyun Dong Choon, Lee Sungwon
Department of Physics and Chemistry, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Dalseong-Gun, Daegu, 42988, Republic of Korea.
Dongnam Division, Korea Institute of Industrial Technology, Busan, 46938, Republic of Korea.
Sci Rep. 2023 Oct 27;13(1):18413. doi: 10.1038/s41598-023-45372-0.
Within the field of wearable devices, polydimethylsiloxane (PDMS) has long been one of the most prominent materials utilized. It is therefore unsurprising that demands for its usage has now extended beyond experimental works into computational simulations, particularly those involving finite element method (FEM). To replicate the mechanical properties of PDMS in FEM, an accurate constitutive model is required, preferably one that encompasses wide ranges of PDMS elasticity. In this study, we determine Mooney-Rivlin 5 parameters as the best hyperelastic model fitted against PDMS experimental data, and proceed to construct a parameter correlation plot combining PDMS of different elasticities together. Experimental validation using PDMS samples fabricated via 3D-printed molds is then performed using parameters extracted from this plot, showing good agreement between simulation and experimental result. In addition, to reflect model applicability, simulations related to basic mechanical deformations involved in flexible devices (compression, stretching, bending and twisting) are performed and analyzed. Further analysis is also performed to investigate the effect of combining different experimental datasets as input into the model. We expect our work to be potentially helpful to be applied as both framework and database for wearable device engineers and researchers who are experimenting with varying PDMS concentrations and modulus.
在可穿戴设备领域，聚二甲基硅氧烷（PDMS）长期以来一直是最常用的材料之一。因此，现在对其使用的需求已从实验工作扩展到计算模拟，尤其是那些涉及有限元方法（FEM）的模拟，这并不奇怪。为了在有限元方法中复制PDMS的力学性能，需要一个精确的本构模型，最好是一个涵盖广泛PDMS弹性范围的模型。在本研究中，我们确定了Mooney-Rivlin 5参数作为拟合PDMS实验数据的最佳超弹性模型，并着手构建一个将不同弹性的PDMS组合在一起的参数相关图。然后使用从该图中提取的参数对通过3D打印模具制造的PDMS样品进行实验验证，结果表明模拟和实验结果吻合良好。此外，为了反映模型的适用性，还对与柔性设备中涉及的基本机械变形（压缩、拉伸、弯曲和扭转）相关的模拟进行了分析。还进行了进一步分析，以研究将不同实验数据集作为模型输入的影响。我们期望我们的工作可能有助于为正在试验不同PDMS浓度和模量的可穿戴设备工程师和研究人员提供框架和数据库。
