A highly accurate X-ray damage characterization technique was used in this study to investigate the correlation between hole damage, tool wear and thrust force in drilling of carbon fibre reinforced laminates. Woven carbon/epoxy panels were drilled with a twist tool for 592 holes and the internal damage induced by drilling was investigated by high-resolution penetrant-enhanced X-radiography for comparison with damage evaluated by visual inspection. The study shows that the dominant damage mode induced by drilling is delamination and that tool wear has a significant effect on the size of the delaminated area. The analyses also show that the delaminated areas estimated by visual inspection are much smaller than those identified by X-radiography. This finding indicates that visual observation techniques may provide dangerously unconservative indications and should be used in association with more reliable damage evaluation methods to assess the hole quality of drilled carbon fibre reinforced composites.

本研究使用了一种高精度的 X 射线损伤表征技术来研究孔损伤、工具磨损和碳纤维增强层压板钻孔过程中的推力之间的相关性。用扭曲工具钻出 592 个孔的编织碳/环氧树脂板，并通过高分辨率渗透增强 X 射线照相术研究由钻孔引起的内部损坏，以与通过目视检查评估的损坏进行比较。研究表明，钻孔引起的主要损伤模式是分层，工具磨损对分层区域的大小有显着影响。分析还表明，通过目视检查估计的分层区域远小于 X 射线照相确定的分层区域。