Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT, USA.
Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY.
Comput Methods Biomech Biomed Engin. 2022 Dec;25(16):1785-1795. doi: 10.1080/10255842.2022.2038141. Epub 2022 Feb 11.
The objective of this paper is to elucidate the response to contact stresses of Polymer Infiltrated Ceramic Network (PICN) using the microscopic viscoplastic finite elements, validated by clinically relevant tests. A feldspathic ceramic material, namely Vita Mark II, is an interconnected structure infiltrated with the polymer (PMMA). Axisymmetric finite element microstructure models are reconstructed from two-dimensional images of a PICN microstructure. Viscoplastic finite element analysis (FEA) with various degrees of microscopic damages occurring over contact is performed. The force-displacement responses obtained from FEA are validated with Hertzian contact tests. Finite element results for force-displacement, stresses and strains in each phase are discussed. We hypothesize that the resistance to fracture of PICN can be further improved by microstructural tailoring. The experimental evidence suggests that a composite material is both more resistant to displacement under load and more resistant to crack initiation and propagation, as hypothesized. Further parametric study on the effects of various volume fractions of two phases in PICN is done to provide some insight on increased contact damage resistance of PICN as well as potential optimization of microstructures.
本文旨在通过微观粘塑性有限元法阐明聚合物渗透陶瓷网络（PICN）对接触应力的响应，并用临床相关的试验进行验证。长石陶瓷材料，即 Vita Mark II，是一种用聚合物（PMMA）渗透的互穿结构。从 PICN 微观结构的二维图像重建轴对称有限元微观结构模型。对发生接触的各种微观损伤程度进行粘塑性有限元分析（FEA）。从 FEA 获得的力-位移响应与赫兹接触试验进行验证。讨论了各相的力-位移、应力和应变的有限元结果。我们假设通过微观结构设计可以进一步提高 PICN 的抗断裂能力。实验证据表明，正如假设的那样，复合材料在承受载荷时更能抵抗位移，并且更能抵抗裂纹的萌生和扩展。进一步对 PICN 中两相的不同体积分数的影响进行参数研究，以提供 PICN 增强接触损伤阻力的一些见解以及微观结构的潜在优化。
