Abstract
The results of a detailed experimental study of the Nd:YAG laser drilling of multi-layer carbon fibre composites are presented. With the laser operating in long pulse mode (fixed Q cavity) the effect of differences in fibre orientation in adjacent layers on the hole profile is investigated and detailed single pulse drilling characteristics, giving hole diameter as a function of material thickness and pulse energy, are presented. The effect of beam quality on hole depth is measured. In the case of multiple pulse drilling the ‘breakthrough energy’ (number of pulses × pulse energy) required to drill through a 2mm thick sample is presented as a function of pulse energy, in stationary air and argon atmospheres and in a partial vacuum. For the laser operating in Q-switched mode (10ns pulses) breakthrough energies are presented as a function of pulse energy for the fundamental (1064nm), frequency doubled (532nm) and frequency tripled (355nm) wavelengths. These are given for air and argon atmospheres and for a partial vacuum, and are discussed with reference to plasma formation.The results of a detailed experimental study of the Nd:YAG laser drilling of multi-layer carbon fibre composites are presented. With the laser operating in long pulse mode (fixed Q cavity) the effect of differences in fibre orientation in adjacent layers on the hole profile is investigated and detailed single pulse drilling characteristics, giving hole diameter as a function of material thickness and pulse energy, are presented. The effect of beam quality on hole depth is measured. In the case of multiple pulse drilling the ‘breakthrough energy’ (number of pulses × pulse energy) required to drill through a 2mm thick sample is presented as a function of pulse energy, in stationary air and argon atmospheres and in a partial vacuum. For the laser operating in Q-switched mode (10ns pulses) breakthrough energies are presented as a function of pulse energy for the fundamental (1064nm), frequency doubled (532nm) and frequency tripled (355nm) wavelengths. These are given for air and argon atmospheres and for a pa...
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