Analysis of Drill Tool Wear Using Acoustic Emission Signals Based on IBS Technique for CFRP Laminates

Carbon fiber reinforced polymer (CFRP) based structures are widely used in aerospace and automobile application due to their excellent strength to weight ratio. Making a product using this CFRP component along with other components requires a hole to be drilled for assembly requirements. The holes drilled in CFRP leads to delamination at entry and exit. These delaminations occur due to improper selection of cutting conditions, drill tool geometry and wear. For delamination free drilling without compromising on productivity requires monitoring the process. In this work acoustic emission signals collected during the drilling process used to evaluate the extent of delamination and tool wear. The time, frequency domain and information based similarity approaches were used to evaluate the information content of the AE signals. The evaluated parameters clearly distinguish the delamination and the tool wear that occurred during the process. This approach can be easily adapted for online continuous monitoring of the process to assess the extent of damages for defect-free drilling of composites for various applications.