含孔隙复合材料超声衰减分析的细观有限元模型

基于DIGIMAT/FE建立含孔隙复合材料细观模型，模型涵盖纤维、树脂和孔隙三相，有效反映了复合材料真实的微结构和细观材料属性，结合通用的ABAQUS/EXPLICIT对细观模型施加超声波激励。通过提取超声波在材料内传播云图，建立了单向连续纤维增强复合材料超声衰减和孔隙率的关系。以T800/环氧树脂复合材料体系为例，研究孔隙尺寸对超声衰减系数模拟结果的影响，并将数值模拟结果与解析模型得到的经验关系进行对比，验证了模型的有效性。该方法能够有效地指导实验过程，为降低复合材料孔隙率、提高其性能提供理论依据。

A mesoscale ultrasonic attenuation finite element model of void-containing composites

A mesoscale model of void-containing composites was built by DIGIMAT/FE, which includes three phases (fiber, resin and void) and effectively reflects the real microstructure and mesoscale material properties of the composites. Ultrasonic excitation was loaded into the model by ABAQUS/EXPLICIT for finite element analysis (FEA). Acoustic propagation process was extracted to build a relationship between ultrasonic attenuation coefficient and porosity of unidirectional continuous fiber reinforced composites. Taking T800/epoxy composite as an example, the effect of void size on the numerical prediction of ultrasonic attenuation was studied, and the accuracy of the FEA model was verified by making a comparison between the numerical and analytical predictions. The simulation method will be an effective guidance for experimental process, and a theoretical basis for reducing porosity to increase the service performance of composites.