织物增强复合材料Micro-CT辅助数值仿真技术研究进展

Advances in Micro-CT aided numerical simulation of fabric-reinforced composites

精确的数值模型是获得可靠的数值仿真结果的前提。显微计算机断层扫描(Micro-CT)技术可无损成像复合材料的内部结构,据此建立的数值模型比理想化模型更具代表性。本文综述了基于Micro-CT图像的复合材料介观模型构建方法及其在材料虚拟测试中的应用,提出了Micro-CT辅助数值仿真的概念。首先,对Micro-CT成像原理、设备特点和织物增强复合材料的成像难点进行了讨论。其次,梳理了现有的MicroCT辅助建模技术的特点,将其建立的模型划分为间接模型、体素模型和数字材料孪生模型,重点介绍了构建各类模型的理论基础和技术途径,指出了各自的优势和局限性。然后对Micro-CT辅助数值仿真技术在织物增强复合材料的成型工艺和力学性能预测等方面的应用进行了总结,表明了该技术的重要价值。最后,对Micro-CT辅助数值仿真技术的未来发展进行了展望。

Reliable numerical simulation results depend on the use of accurate numerical models.Micro-computed tomography(Micro-CT)technology is capable of non-destructively imaging the internal structure of composite materials,hence,numerical models reconstructed from it are more representative than the idealized ones.Here,a review is presented for constructing mesoscopic models of composite materials based on Micro-CT images and its application in virtual testing.A novel concept,Micro-CT aided numerical simulation,is proposed.First,the principle of Micro-CT imaging,the characteristics of equipment,and the difficulties with scanning fabric-reinforced composites are discussed.Second,the characteristics of existing Micro-CT aided modeling techniques are analyzed and compared.The models are divided into three types including indirect,voxel,and digital material twin ones.The theoretical basis and technical approaches for constructing each type of model are highlighted,and the advantages and limitations of each are analyzed.Then recent applications of Micro-CT aided numerical simulation in composite molding process and mechanical property prediction of fabric reinforced composites are summarized,showing the potential and importance of the technology.Finally,the future of Micro-CT aided numerical simulation technology is anticipated.