Novel in-situ residual strain measurements in additive manufacturing specimens by using the Optical Backscatter Reflectometry

• DOI: 10.1016/j.addma.2020.101040
• Publication Date: 2020-01-06T02:53:33Z
• Authors: Shaoquan Wang; Kaspar Lasn; Christer Westum E...; Di Wan; Andreas Echtermeyer
• Keywords: Reflectometry; Backscatter (email); Strain (injury)

Material extrusion (MEX) is a well established production method in additive manufacturing. However, internal residual strains are accumulated during the layer-by-layer fabrication process. They bring about shape distortions and degradation of mechanical properties. In this paper, an in-situ distributed measurement MEX fabricated thermoplastic specimens achieved for first time. This innovative measuring system consists Optical Backscatter Reflectometry (OBR) interrogation unit connected to fiber optic strain sensor which embedded The characteristic distribution inside 3D printed components revealed numerically validated. main mechanisms creation sensing principles OBR described. A minimum range 4 mm spatial resolution 0.15 were experimentally demonstrated. potential technology detecting invisible manufacturing defects was shown by trial experiment.