Patki Amol S, Vural Murat, Gosz Mike
Department of Mechanical, Materials, and Aerospace Engineering, Illinois Institute of Technology, 10 West 32nd Street, Chicago, IL 60616, USA.
J Compos Mater. 2011 Aug;45(18):1863-1872. doi: 10.1177/0021998310388318.
This study focuses on the mechanical response of a particle-reinforced restorative dental composite (Renew™) under proportional transverse confinement to understand the effects of stress multiaxiality on its mechanical and failure behaviors. We describe the confining ring technique as an experimental tool to introduce multiaxial compressive stress states in dental composites that realistically mimic three-dimensional stress states commonly experienced by dental restorations in the oral cavity. Effect of initial radial misfit between confining ring and specimen is analyzed through computational finite element simulations, and an analytical treatment of problem is also provided to compute the confining stress during elasto-plastic expansion of confining ring. Experimental results suggest that inelastic response of Renew composite is significantly influenced by hydrostatic stress component, and pressure-dependent yield functions are required to analyze plastic deformations and internal damage accumulation process.
本研究聚焦于颗粒增强型牙科修复复合材料（Renew™）在比例横向约束下的力学响应，以了解应力多轴性对其力学和失效行为的影响。我们将约束环技术描述为一种实验工具，用于在牙科复合材料中引入多轴压缩应力状态，该状态能真实模拟口腔中牙齿修复体通常所经历的三维应力状态。通过计算有限元模拟分析了约束环与试样之间初始径向失配的影响，并提供了问题的解析处理方法以计算约束环弹塑性膨胀过程中的约束应力。实验结果表明，Renew复合材料的非弹性响应受静水应力分量的显著影响，并且需要依赖压力的屈服函数来分析塑性变形和内部损伤累积过程。
