基于非接触光声成像的碳纤维增强复合材料冲击损伤检测方法

为了探究碳纤维增强复合材料(CFRP)的损伤机制并对其制造过程进行质量监控,对 CFRP 的冲击损伤区域进行了高分辨无损检测。 构建了全光式非接触光声显微(AONC-PAM)成像系统,利用自主开发的光学吸收结合背向散射的双对比度成像模式,对 CFRP 在不同冲击能量下的损伤区域进行高分辨率无损检测。 实验结果显示,AONC-PAM 系统的空间分辨率为2. 9±0. 5 μm;双对比度成像策略能以 2 s/ 帧的速率同时获得基于光学吸收和表面散射特性的图像及两者叠加的双对比度图像;AONC-PAM 系统显示了比通用明场显微镜系统更多的成像细节,包括碳纤维分布和其他微观缺陷如纤维断裂、错位、缺束和褶皱,可检测的微观缺陷尺寸达 10~ 20 μm,并实现了损伤区域的精准量化。

Non-contact photoacoustic imaging-based detection of impact damage in carbon fiber reinforced plastic composites

To investigate the damage mechanism of carbon fiber reinforced plastics ( CFRP) and monitor its manufacturing processquality, high-resolution non-destructive testing was conducted on the impact-damaged areas of CFRP. An all-optical non-contactphotoacoustic microscopy ( AONC-PAM) imaging system was constructed, utilizing a self-developed dual-contrast imaging modecombining optical absorption with backscattering, for high-resolution non-destructive testing of CFRP′s damage areas under differentimpact energies. Experimental results showed that the spatial resolution of the AONC-PAM system was 2. 9 ± 0. 5 μm. The dual-contrast imaging strategy enabled acquisition of images based on optical absorption and surface scattering characteristicssimultaneously, as well as their overlay, at a rate of 2 seconds per frame. The AONC-PAM system revealed more imaging detailscompared to the conventional brightfield microscopy system, including carbon fiber distribution and other microscopic defects such asfiber breaks and delamination, missing bundles, and wrinkles, with detectable defect sizes ranging 10 ~ 20 μm, facilitating precisequantification of damaged areas.