Z-pin增强复合材料层合板缺陷的红外检测技术研究

RESEARCH ON THE INFRARED TESTING TECHNOLOGY FOR DEFECT IN THE Z-PIN REINFORCED COMPOSITE LAMINATES

针对Z-pin增强碳纤维复合材料层合板在制造中产生的典型缺陷,本文在分析其对温度场的作用的基础上,研究了Z-pin结构中缺陷热特征提取的方法。用有限元法分析了不同尺寸Z-pin植入后产生的富树脂区缺陷、不同深度的Z-pin断裂缺损缺陷、不同角度的Z-pin倾斜缺陷与可检测信息参数之间的关系,对富树脂区缺陷的检测进行了实验验证。研究结果表明:最大温差与最大对比度随着富树脂区面积的增大而增大,随着Z-pin缺损深度的增大而减小,随着Z-pin倾斜角度的增大而增大,增大或减小的程度均呈非线性关系;红外热像实验与仿真结果一致。研究结果为Z-pin增强复合材料层合板缺陷与损伤的红外热像检测与评估提供了理论依据与技术支持。

Aiming at the typical defects of Z-pin reinforced carbon fiber composite laminates in manufacturing, and based on the analysis of its effect on the temperature field, this paper studies the method of defect thermal feature extraction in Z-pin structure. The finite element method was used to analyze the relationship between different sizes of resin-rich region defects, different depths fracture of Z-pin, different angles of Z-pin, and detectable information parameters. Experimeutal tests were carried out to verify the detection of resin-rich region defects. The results show that the maximum temperature difference and maximum contrast increase with the increase of the area of the rich resin region, decrease with the increase of the Z-pin fracture depth, and increase with the increase of the Z-pin tilt angle, for which both the degree of reduction and promotion are nonlinear. The infrared thermal imaging experiment is consistent with the simulation results. The research results provide theoretical basis and technical support for infrared thermal imaging detection and evaluation of Z-pin reinforced composite laminate defects and damage.