复合材料曲面板导波全场激光动测与隐蔽损伤成像研究

复合材料在冲击等因素作用下易产生纤维断裂、分层等隐蔽损伤，而微小隐蔽损伤也可能引发结构整体破坏，故隐蔽损伤精确诊断技术对保障复合材料结构安全服役至关重要。基于导波全场激光动测的损伤诊断是一项有潜力的新技术。该技术多用于平板，较少涉及广泛存在的曲面板，而平板一维激光动测系统不适用于曲面板；其损伤成像理论与方法主要为基于傅里叶变换的波数域分析，对损伤细节及微小隐蔽损伤刻画能力不足。故本项目聚焦复合材料曲面板隐蔽损伤精确诊断，拟搭建基于三维激光动测的曲面板波场量测系统，建立匹配激光动测系统的隐蔽损伤精确成像理论与方法。主要包括：提出复合材料曲面板隐蔽损伤波场奇异表征范式与成像原理，建立波场小波奇异性分析支持的复合材料曲面板隐蔽损伤成像方法，开展曲面板波场量测与损伤成像模型实验。有望突破既有平板激光动测与损伤成像技术瓶颈，为复合材料曲面板隐蔽损伤精确成像提供技术支撑，保障复合材料结构安全服役。

Composite materials are prone to fiber fracture, delamination and other hidden damage under the impact and other factors, and small hidden damage may also lead to overall failure of the structure. Therefore, the accurate diagnosis technology of hidden damage is very important to ensure the safe service of composite structures. Damage diagnosis based on laser dynamic measurement of guided full wavefield is a potential new technology. This technology is mostly used in flat plates, but less involved in the widely existing curved plates, and the 1D laser dynamic measurement system for flat plates is not suitable for curved plates; its damage imaging theory and method is mainly based on the wavenumber domain analysis supported by Fourier transform, and its ability to depict the damage details and micro hidden damage is insufficient. Therefore, this project focuses on the accurate diagnosis of hidden damage in composite curved plates, and plans to build a 3D laser dynamic measurement system of wavefield for the curved plates, and establish the accurate imaging theory and method of hidden damage matching with the laser dynamic measurement system. The main research contents include: proposing the wavefield singularity representation paradigm and imaging principle of hidden damage in composite curved plates, establishing the imaging method of hidden damage in composite curved plates supported by wavelet singularity analysis of wavefield, and conducting the wavefield measurement and damage imaging model experiments of curved plates. It is expected to break through the bottleneck of the existing laser dynamic measurement and damage imaging technology for flat plates, provide technical support for the accurate imaging of hidden damage in composite curved plates, and ensure the safe service of composite structures.