The present work estimated the accuracy of non-destructive tests in quantifying the delaminated area in CFRP samples submitted to a 4-point end notched flexure test, to evaluate the relevance of measuring the delamination area to calculate fracture toughness in mode II, instead of of the traditional method which evaluates the delamination length visually through the sample lateral faces. In this way, IR thermography, eddy current, ultrasonic microscopy, and X-ray computed microtomography (as reference) tests were employed. A methodological sequence based on image processing algorithms was performed to calculate the values of the delaminated areas for all NDT techniques. The first two techniques did not provide a clear separation between the defective and intact zones and are strongly influenced by edge effects. The result is different for the two last tests, which demonstrated a satisfactory definition of the delamination limit region. The ultrasonic microscopy test revealed results similar to microtomography, proving to be a promising alternative for this type of measurement. In addition, the importance of using more accurate methods in calculating the crack length is emphasized, as the traditional visual measurement can be highly susceptible to errors and does not allow evaluating potential tunneling effects or an uneven delamination front.

目前的工作估计了非破坏性测试在量化提交给 4 点末端缺口弯曲试验的 CFRP 样品的分层区域的准确性，以评估测量分层区域与计算模式 II 中的断裂韧性的相关性，而不是传统方法通过样品侧面直观地评估分层长度。通过这种方式，采用了红外热成像、涡流、超声显微镜和 X 射线计算机显微断层扫描（作为参考）测试。执行基于图像处理算法的方法序列来计算所有 NDT 技术的分层区域的值。前两种技术没有在缺陷区和完整区之间提供清晰的分离，并且受到边缘效应的强烈影响。最后两次测试的结果不同，这表明分层限制区域的定义令人满意。超声显微镜测试显示的结果类似于显微断层扫描，证明是此类测量的有前途的替代方案。此外，强调了在计算裂纹长度时使用更准确方法的重要性，因为传统的视觉测量非常容易出错，并且无法评估潜在的隧道效应或不均匀的分层前沿。