Flaviana Tagliaferri

Experimental investigation on CFRP milling by low power Q-switched Yb:YAG laser source

In the present study, laser milling of CFRP plate by means of a 30W Q-Switched Yb:YAG fiber laser is investigated through statistical analysis. Milling tests were performed at the nominal power changing the pulse power; the scanning speed, the hatch distance and the released energy. Design of Experiments (DoE) and ANalysis Of VAriance (ANOVA) were applied with the aim to improve the process performances in term of material removal rate and heat affected zone extension. The results show that, the adopted laser is an effective solution for the CFRP milling. Moreover, adopting an accurate approach to the problem, process variability and material damages can be easily reduced.

A comparison between wet and cryogenic drilling of CFRP/Ti stacks

ABSTRACT This paper compares conventional and cryogenic cooling in the deep hole drilling of carbon fiber reinforced polymer (CFRP)/Ti stacks. Various parameters are taken into account to find if the use of cryogenic coolant is justified by the improvement of the final results. Both the thrust and the torque were acquired continuously during the machining operations and compared both in average and distribution. The use of a cryogenic coolant brings a reduction in thrust force and torque without any sensible drawback. Overall the results prove that cryogenic drilling is a suitable technology for CFRP/Ti stack drill.

A Systematic Approach to Design of Experiments in Waterjet Machining of High Performance Ceramics

The main objective of this chapter is to highlight the strategic role that a systematic and sequential approach of experimentation plays in order to achieve competitive advantage and technological innovation. The efficacy of this approach is demonstrated by describing an application where the appropriate use of statistical knowledge, along with technological knowledge, has allowed to characterize manufacturing processes, to catalyze the innovation process and to promote the technological transfer. Moreover this approach, based on the use of customized pre-design guide sheets, allows to put into action a virtuous cycle of sequential learning and helps to overcome the gap between practitioners and statisticians in effective application of Design of Experiments (DoE) .