Centre of Research in Mechanical Engineering - CIIM, Dept. of Mechanical Engineering and Materials, Universitat Politècnica de València, Camino de Vera, 46022 Valencia, Spain.
Centre of Research in Mechanical Engineering - CIIM, Dept. of Mechanical Engineering and Materials, Universitat Politècnica de València, Camino de Vera, 46022 Valencia, Spain.
Mater Sci Eng C Mater Biol Appl. 2021 Jan;120:111754. doi: 10.1016/j.msec.2020.111754. Epub 2020 Nov 27.
Open cell polyurethane foams are often used as cancellous bone surrogates because of their similarities in morphology and mechanical response. In this work, open cell polyurethane foams of three different densities are characterized from morphometric and mechanical perspectives. The analysis of micro-computed tomography images has revealed that the high density foams present the greatest inhomogeneities. Those inhomogeneities promoted the failure location. We have used the finite element models as a tool to estimate elastic and failure properties that can be used in numerical modeling. Furthermore, we have assessed the anisotropic mechanical response of the foams, whose differences are related to the morphometric inhomogeneities. We found significant relationships between morphometry and the elastic and failure response. The detailed information about morphometry, elastic constants and strength limits provided in this work can be of interest to researchers and practitioners that often use these polyurethane foams in orthopedic implants and cement augmentation evaluations.
开孔型聚氨酯泡沫因其在形态和机械响应方面的相似性而常被用作松质骨替代物。在这项工作中，从形态计量学和力学的角度对三种不同密度的开孔型聚氨酯泡沫进行了表征。对微计算机断层扫描图像的分析表明，高密度泡沫的各向异性程度最大。这些各向异性促进了失效位置的出现。我们已经使用有限元模型作为一种工具来估计弹性和失效特性，这些特性可用于数值建模。此外，我们评估了泡沫的各向异性力学响应，其差异与形态计量学的各向异性有关。我们发现形态计量学与弹性和失效响应之间存在显著的关系。本工作提供的有关形态计量学、弹性常数和强度极限的详细信息可能会引起经常在矫形植入物和水泥增强评估中使用这些聚氨酯泡沫的研究人员和从业者的兴趣。
