先进树脂基复合材料作为一种关键基础材料，因其优良的力学和物理性能广泛应用于航空航天、土木工程和汽车工业等领域。生产制造过程中工艺参数变量的微小差异和加工、运输、服役过程中载荷、振动、湿热等环境因素的综合作用，使得先进树脂基复合材料中脱粘、分层、裂纹等面积型缺陷时有出现，直接影响整体结构的安全运行和使用寿命。本项目立足发展先进树脂基复合材料兰姆波传播的相关理论，研究面积型缺陷的散射/增量散射理论与测量方法，突破基于稀疏传感器阵列的全向散射评估技术，实现面积型损伤的量化表征和定位成像。研究重点为：1）粘弹性各向异性多相介质兰姆波频散方程的导出及求解；兰姆波本征模态的内在检测机理。2）脱粘缺陷三维散射解析理论模型的建立；增量散射的有限元数值模拟。3）散射波全向散射系数测量和实验表征；实验测量影响因素分析。4）多路径多模态散射信号处理和成像。最终形成具有自主知识产权的散射/增量散射评价成套技术。

The advanced polymer matrix composites as a class of key fundamental materials, due to their excellent mechanical and physical properties, have been widely used in aerospace, civil engineering and automotive industries. The small differences of process parameters in manufacturing procedure and the comprehensive effects of environmental factors such as loads, vibration, heat and moisture in the process of processing, transportation and service, have prompted the area damages such as debonding, delamination and cracks to occur frequently in advanced polymer matrix composites, which directly affects the operation safety and results in a reduction for the service life of the structures. This project focuses on developing the corresponding propagation theory of Lamb waves in the advanced polymer matrix composites, studying the theoretical and measured approaches of scattering or incremental scattering for the area damages, and exploring the breakthrough on the key technologies for the scattering evaluation based on the spare transducers array with an aim to implement a quantitative characterization and localization imaging. This project will mainly emphasize on the following aspects: 1) to derive and solve dispersion equations of Lamb waves in viscoelastic anisotropic multiphase medium, and to investigate the intrinsic detection mechanism of Lamb wave modes. 2) to establish three-dimensional model of analytical scattering theory for the debonding defect, and to simulate an incremental scattering in finite element method. 3) to measure and characterize the omnidirectional scattering patterns experimentally, and to analyse the influence factors of experimental measurement. 4) to make the scattering signal processing and imaging with multi modes in multi-path. As a result, a number of core technologies with the independent intellectual property rights are developed for the evaluation of scattering or incremental scattering.