LAUSR

Abstract Additive manufacturing has been widely applied in various industrial sectors due to its numerous advantages. From available reports, in-situ real-time monitoring is still a challenge during additive manufacturing process. In this study, the Coherent Gradient Sensing (CGS) method is applied to in-situ monitoring during Fused Deposition Modeling (FDM) process for the first time. And a CGS system is designed to realize deformation monitoring during FDM process. By using the system, the full-field deformation evolution of Polylactic Acid (PLA) is studied at different stages of FDM process. Besides, it was found that the evolution process of the deformation can be divided into three stages during cooling process: fast cooling stage, transitional cooling stage and slow cooling stage. The results demonstrate that the CGS method has the advantages of real-time, full-field, intuitive, vibration resistant, and possess a good potential to be applied in stress analysis of other 3D printing techniques.