3D Eigenstrain Reconstruction of Residual Stresses Using the Strain Tomography Technique in Laser Powder Bed Fusion Printed Bodies

The printing parameters of laser powder bed fusion techniques should be optimised in a way to minimize magnitude of residual stresses. Eigenstrain theory provides an alternative for 3D residual stress mapping by combining experimental data from optical profilometry measurements with numerical models. The proposed experiment aims to interpret 2D plane distribution of residual strains using strain tomography technique at different layers of CM 247 LC specimen. The data from strain tomography measurements will take place of optical profilometry data for the 3D eigenstrain reconstruction of residual stresses. This will provide cross validation between reconstructed residual stresses using two data set. The results of this experiment will allow the use of low cost and accurate eigenstrain reconstruction method, that use optical profilometry data, for 3D residual stress mapping in LPBF printed parts reliably and will help optimisation of printing parameters of LPBF techniques.