Zhao Feng-Yuan, Jiang Jun, Bai Shu-Xin, Chen Qiang, Ye Yi-Cong
Department of Materials Science and Engineering, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China.
Department of Applied Mechanics, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China.
Sci Rep. 2024 Sep 27;14(1):22065. doi: 10.1038/s41598-024-73228-8.
A novel, parameter-independent multiscale correlational constitutive model has been devised to predict thermomechanical properties of Si-diamond-SiC and Si-diamond composites, including the effective elastic modulus, effective bulk modulus, effective shear modulus, effective Poisson's ratio, average coefficients of thermal expansion as well as thermal conductivity. Based on this model, the effective thermomechanical response of two kinds of composites was simulated, and the underlying mechanisms of thermomechanical coupling between constituents were also critically evaluated. The findings were shown that the effective elastic properties of composites, including effective elastic modulus, effective bulk modulus, effective shear modulus, increased with diamond and SiC, and that the introduction of dispersed diamond with highly thermal conductivity and lowly thermal expansion significantly enhanced thermophysical properties of Si-diamond-SiC composites. The thermomechanical coupling of these composites was influenced by the effective elastic properties of composites and the disparity in the intrinsic properties of constituents.
一种新颖的、与参数无关的多尺度相关本构模型已被设计出来，用于预测硅-金刚石-碳化硅和硅-金刚石复合材料的热机械性能，包括有效弹性模量、有效体积模量、有效剪切模量、有效泊松比、平均热膨胀系数以及热导率。基于该模型，模拟了两种复合材料的有效热机械响应，并对组分之间热机械耦合的潜在机制进行了严格评估。结果表明，复合材料的有效弹性性能，包括有效弹性模量、有效体积模量、有效剪切模量，随金刚石和碳化硅的增加而增加，并且引入具有高导热率和低热膨胀率的分散金刚石显著提高了硅-金刚石-碳化硅复合材料的热物理性能。这些复合材料的热机械耦合受复合材料的有效弹性性能和组分固有性能差异的影响。
