基于多模式超声成像的CFRP冲击损伤无损表征与冲击后压缩强度预测

Ultrasonic nondestructive characterization of impact damage and compression after impact for CFRP based on multi-mode imaging

为实现含冲击损伤复合材料层板损伤特性和剩余强度的定量无损表征,提出了一种基于多模式超声成像的CFRP层板冲击损伤表征与冲击后压缩强度预测方法。首先,基于相控阵超声多模式成像技术获得了不同冲击载荷下AC631/CCF800H双马来酰亚胺树脂基复合材料层板分层损伤的位置、尺寸和分布信息,随后,以层析C扫描图像为基础,引入等效开孔体积对其冲击后压缩强度进行了预测。结果表明:相控阵超声B扫描、声程C扫描和层析C扫描等多种成像模式相结合,能够有效描述层板内部分层损伤的形貌、尺寸及三维空间分布特征;与凹坑深度拟合和最大开孔体积拟合等传统方法相比,基于层析C扫描图像的等效开孔体积与CFRP层板的冲击后压缩强度相关性更大,预测结果也更为精确。相关研究成果可为复合材料冲击损伤过程精细化分析和材料力学性能定量无损表征提供一定的借鉴和参考。

In order to realize the quantitative nondestructive characterization for the impact damage and residual strength of composite laminate,a phased array ultrasonic multi-mode imaging method for damage imaging and compressive strength prediction of CFRP laminate is proposed.The location,dimension and distribution of the delamination damages under different impact energy are obtained using phased array ultrasonic.Furthermore,the compression after impact(CAI)of AC631/CCF800H composite laminates is predicted by using equivalent through-hole volume based on tomographic C-scan.The results show that the combine of B-scan,depth C-scan and tomographic C-scan can effectively describe the morphology,dimension and spatial distribution characteristics of the delamination damages.Compared with traditional fitting methods,the equivalent through-hole volume based on tomographic C-scan images has a greater correlation with the compressive strength,and the CAI prediction results are more accurate.Relevant research can provide a reference for the analysis of impact damage process and quantitative nondestructive characterization of mechanical properties of composites.