A research study was performed during which a hat-stiffened composite panel was manufactured and tested in order to assess the abilities of four advanced diagnostic tools to characterize skin-to-stringer separation growth in post-buckled conditions. Teflon film was inserted between the hat flanges and the skin to create an initially disbonded region. The four diagnostic tools included a hand-held ultrasonic scanner, 3D digital image correlation, a fiber optic strain interrogator, and thermo-elastic stress analysis. A standard procedure was used for the ultrasonic system, but the other three advanced devices required MATLAB algorithms to define the damage zone based on peak strains along the loading direction. The results showed that all four techniques were able to characterize skin-to-stringer separation, with the largest difference between the measurements being approximately 5%.

进行了一项研究研究，在此过程中制造并测试了帽子加硬的复合板，以评估四种先进的诊断工具在扣紧后表征皮肤到纵梁分离生长的能力。将聚四氟乙烯薄膜插入帽子的凸缘和皮肤之间，以形成最初的剥离区域。四种诊断工具包括手持式超声波扫描仪，3D数字图像关联，光纤应变询问器和热弹性应力分析。超声系统使用了标准程序，但是其他三个高级设备需要MATLAB算法，以基于沿加载方向的峰值应变来定义损坏区域。结果表明，所有四种技术都能够表征皮肤到纵梁的分离，