Tashkinov Mikhail, Tarasova Anastasia, Vindokurov Ilia, Silberschmidt Vadim V
Laboratory of Mechanics of Biocompatible Materials and Devices, Perm National Research Polytechnic University, Komsomolsky Ave., 29, 614990 Perm, Russia.
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Leicestershire LE11 3TU, UK.
Polymers (Basel). 2023 Oct 13;15(20):4076. doi: 10.3390/polym15204076.
This study is focused on the deformation behaviour of composites formed by auxetic lattice structures acting as a matrix based on the re-entrant unit-cell geometry with a soft filler, motivated by biomedical applications. Three-dimensional models of two types of the auxetic-lattice structures were manufactured using filament deposition modelling. Numerical finite-element models were developed for computational analysis of the effect of the filler with different mechanical properties on the effective Poisson's ratio and mechanical behaviour of such composites. Tensile tests of 3D-printed auxetic samples were performed with strain measurements using digital image correlation. The use of the filler phase with various elastic moduli resulted in positive, negative, and close-to-zero effective Poisson's ratios. Two approaches for numerical measurement of the Poisson's ratio were used. The failure probability of the two-phase composites with auxetic structure depending on the filler stiffness was investigated by assessing statistical distributions of stresses in the finite-elements models.
本研究聚焦于基于具有软填料的重入式晶胞几何结构的负泊松比晶格结构作为基体形成的复合材料的变形行为，其动机源于生物医学应用。使用丝状沉积建模制造了两种类型的负泊松比晶格结构的三维模型。开发了数值有限元模型，用于计算分析具有不同力学性能的填料对这类复合材料有效泊松比和力学行为的影响。使用数字图像相关技术进行应变测量，对3D打印的负泊松比样品进行了拉伸试验。使用具有各种弹性模量的填料相导致了正、负和接近零的有效泊松比。采用了两种数值测量泊松比的方法。通过评估有限元模型中应力的统计分布，研究了具有负泊松比结构的两相复合材料取决于填料刚度的失效概率。
