| Popis: |
The development of a process planning aid for laser drilling operations is here presented. The system is made of two parts: first, an analytical model determines the shape of the material removing zone. Then, the distribution in time of the cavity geometrical extent, which corresponds to the melting isothermal, is used as an input in a finite element analysis, allowing a simplified solution for bulk material properties prediction. This hybrid approach, avoiding time-consuming full-FEM analyses, allows both to evaluate the heat affected zone extent and to predict the residual stress field at the end of the process. The proposed model has been experimentally veryfied by means of laser drilling experiences on low-carbon ASTM A366 steel and polimetil-metacrilate PMMA, evaluating the shape of the performed holes. |
