Experimental and Mathematical Characterization of Coronary Polyamide 12 Balloon Catheter Membranes

The experimental quantification and modeling of the multiaxial mechanical response of polymer membranes of coronary balloon catheters have not yet been carried out.<br>Due to the lack of knowledge of such a study, it is not known whether isotropic material models can describe the material response of balloon catheter membranes expanded with the nominal or an even higher pressure. Therefore, for the first time, specimens of commercial polyamide 12 balloon catheters membranes were observed by performing uniaxial and biaxial extension tests. The quasi-static and dynamic testing scenarios include rupture, relaxation, and equibixial testing procedures. Novel clamping techniques are described, which allow even to test tiny specimens taken from the balloon membranes. The results of this study reveal the semi-compliant, nonlinear, and viscoelastic character of polyamide 12 balloon catheter membranes.Above nominal pressure, the membranes show a pronounced anisotropic mechanical behavior with a stiffer response in the circumferential direction.The anisotropic feature intensifies with an increasing strain-rate. A modified polynomial model was applied to represent the realistic mechanical response of the balloon catheter membranes during dynamic biaxial extension tests.This study also includes a compact set of constitutive model parameters for the use of the proposed model in future finite element analyses to perform more accurate simulations of expanding balloon catheters.<br>This data set contains experimental data collected in biaxial tensile tests presented in Figs 6, 7, 8, 9, 10, 13, 14, and the Cauchy stress-stretch relation until failure of the median and all single samples as depicted in Fig 12 in the respective publication.<br>See the attached readme file for a description of the data.<br>

目前尚未针对冠状动脉球囊导管聚合物膜的多轴力学响应开展实验量化与建模研究。
由于此类研究的缺失，目前尚无法确认各向同性材料模型是否能够准确描述标称压力乃至更高压力下扩张的球囊导管膜的力学响应。
因此，本研究首次通过单轴与双轴拉伸试验，对商用聚酰胺12（polyamide 12）球囊导管膜试样进行了力学表征。
本研究涵盖准静态与动态两类试验工况，包含断裂、松弛及等双轴测试流程。
研究还提出了新型夹持技术，可实现从球囊膜上取下的微小试样的力学测试。
本研究结果表明，聚酰胺12球囊导管膜呈现半柔顺性、非线性与黏弹性的力学特性。
当压力超过标称值时，该膜表现出显著的各向异性力学行为，周向刚度更高。
且各向异性程度随应变速率提升而加剧。
本研究采用改进型多项式模型，以准确表征动态双轴拉伸试验中球囊导管膜的实际力学响应。
本研究同时提供了一套精简的本构模型参数集，便于后续有限元分析中使用所提模型，以实现球囊导管扩张过程的高精度仿真。
本数据集包含对应文献中图6、7、8、9、10、13、14所示双轴拉伸试验的采集数据，以及图12所呈现的中位数试样与全部单一样本直至断裂的柯西（Cauchy）应力-拉伸比关系数据。
数据详情请参阅附带的自述文件。