The use of thermoplastic elastomers (TPEs) has become increasingly popular over the years due to growing interest in developing soft robots and compliant mechanisms for various applications. Recent developments in 3D printing technology allows users to print TPEs with pre-specified infill percentages. In order to describe the nonlinear stress-strain behavior of 3D-printed TPE structures using a finite element analysis (FEA), the quantification of hyperelastic material parameters for TPEs at different infill percentages is essential. This study is aimed toward identifying the hyperelastic material parameters for 3D printed TPEs at different infill percentages. The commercial TPE filament, Filastic™, made by BotFeeder is used in this study. Tensile tests are performed to obtain the nonlinear stress-strain relationships for 3D-printed TPE specimens with infill percentages ranging from 30 % to 100 % at 10 % increments. The hyperelastic Ogden model is used to fit the nonlinear stress-strain curves. Regression analyses are performed to investigate the relationships between the infill percentage and each material parameter. The identified hyperelastic material parameters are used to perform an FEA for the tensile test simulation. The simulated results agree well with the experimental data.

多年来，由于对开发用于各种应用的软机器人和顺应性机制的兴趣日益浓厚，热塑性弹性体（TPE）的使用已变得越来越流行。3D打印技术的最新发展允许用户以预先指定的填充百分比打印TPE。为了使用有限元分析（FEA）描述3D打印TPE结构的非线性应力-应变行为，量化在不同填充百分比下TPE的超弹性材料参数至关重要。这项研究旨在确定3D打印TPE在不同填充百分比下的超弹性材料参数。这项研究使用的是BotFeeder生产的商用TPE灯丝Filastic™。进行拉伸测试以获得3D打印TPE标本的非线性应力-应变关系，填充百分比范围为30％至100％，增量为10％。使用超弹性Ogden模型拟合非线性应力-应变曲线。进行回归分析以调查填充百分比和每个材料参数之间的关系。识别出的超弹性材料参数用于执行FEA，以进行拉伸测试模拟。仿真结果与实验数据吻合良好。识别出的超弹性材料参数用于执行FEA，以进行拉伸测试模拟。仿真结果与实验数据吻合良好。识别出的超弹性材料参数用于执行FEA，以进行拉伸测试模拟。仿真结果与实验数据吻合良好。