Acoustic emission in pulsed laser drilling.

Laser Rock Drilling by A Super-Pulsed CO2 Laser Beam

High power carbon dioxide lasers have successfully been used in drilling or cutting ngineering materials such as metals, polymers and ceramics over the years. Can a arbon dioxide laser be used to efficiently drill different rocks in a deep gas well? esearch sponsored by US Department of Energy has been carried out to answer this uestion. This paper will report the study results of using a super...

Acoustic emission in drilling carbon steel and nodular gray iron

Purpose: of this paper is to investigate tool wear monitoring of drilling process by acoustic emission (AE). Design/methodology/approach: of tool wear monitoring in drilling acquires the AE signal and analyses it in the frequency domain. Findings: Tool wear in drilling significantly influences the AE signal independently of the measuring method. This influence is evidently different for various...

Interfaces in Thermoplastic Composites Probed by Laser-Induced Acoustic Emission

The mechanical properties and durability of carbon Þber composites depend not only on the properties of the constituent Þber and matrix but also on the quality of the interfacial bond. Many of the techniques for evaluating this bonding rely on model (e. g. single Þlament) composites (1-3). Besides being difÞcult to prepare and test, these specimens are subject to the criticism that they may not...

Online monitoring of acoustic emission for quality control in drilling of polymeric composites

Automation and optimization of the manufacturing processes play an important role in enhancing productivity. For this, monitoring and diagnostic systems are becoming increasingly necessary to asses the response of materials in manufacturing. In this paper, acoustic emission (AE) sensing was employed for on-line detection of workpiece status and to improve the process stability and workpiece qua...

Micro Drilling Simulation of Ultra-Short Pulsed Laser Ablation of Glass