The level-set method of topology optimization is used to design isotropic two-phase periodic multifunctional composites in three dimensions. One phase is stiff and insulating whereas the other is conductive and mechanically compliant. The optimization objective is to maximize a linear combination of the effective bulk modulus and conductivity of the composite. Composites with the Schwartz primitive and diamond minimal surfaces as the phase interface have been shown to have maximal bulk modulus and conductivity. Since these composites are not elastically isotropic their stiffness under uniaxial loading varies with the direction of the load. An isotropic composite is presented with similar conductivity which is at least 23% stiffer under uniaxial loading than the Schwartz structures when loaded uniaxially along their weakest direction. Other new near-optimal isotropic composites are presented, proving the capablities of the level-set method for microstructure design.
Neural-field design of broadband Rayleigh-wave carpet cloaks under microstructure realisability constraints
M3L Lab, Institute of Mechanics（力学研究所）；Biutopic（比奥托皮克）；The Blackett Laboratory, Department of Physics & UMI 2004 Abraham de Moivre-CNRS, Imperial College London（帝国理工学院布莱克特物理实验室与UMI 2004阿伯拉罕·德·穆瓦夫尔-CNRS联合研究单位）
Homogenization of plain weave composites with imperfect microstructure: Part II--Analysis of real-world materials
提出了一种两层统计等效的周期性单胞模型，用于预测平纹编织多层碳-碳纺织复合材料的宏观响应。在描述这些材料系统的最典型的几何缺陷时，在（Zeman和Šejnoha，International Journal of Solids and Structures，41（2004），pp. 6549- 6571）进行了实质性修改，现在允许纺织织物的各个层在所有三个方向上嵌套和相互移位。然而，本配方的最有价值的资产被认为是通过在晶胞的两层之间引入的扁球形空隙的系统反映可忽略的中尺度孔隙率的影响的可能性。数值预测的有效热导率和弹性刚度和它们的比较与现有的实验室数据和使用Mori-Tanaka平均方案得出的结果支持本方法的可信度，大约一样多的可靠性，发现从纳米压痕测试直接进行分析的复合材料样品的局部机械性能。
On Surrogate Modeling of Static Response of AM Short-Fiber Thermoplastics Using Graph Neural Networks
Graduate Student, Department of Aerospace Engineering, Auburn University, Auburn, AL（航空航天工程系研究生，阿伯丁大学，阿伯丁，AL）；Sr. R&D Staff Member, Manufacturing Science Division, ORNL, Knoxville, TN（制造科学部高级研发人员，ORNL，克里夫兰，TN）；Research Aerospace Engineer, Multiscale and Multiphysics Modeling Branch, NASA Glenn Research Center, Cleveland, OH（多尺度和多物理场建模分支研究航空航天工程师，NASA格伦研究中心，克里夫兰，OH）；Professor, Department of Aerospace Engineering, Auburn University, Auburn, AL（航空航天工程系教授，阿伯丁大学，阿伯丁，AL）；Assistant Professor, Department of Aerospace Engineering, Auburn University, Auburn, AL（航空航天工程系助理教授，阿伯丁大学，阿伯丁，AL）
