Abstract Scope |
Wire arc additive manufacturing (WAAM) is a rising technology to fabricate large-scale metal parts due to its high deposition rate. However, high tensile residual stresses and significant distortion due to thermal cycling may pose a threat to the structural integrity of manufactured parts. As a result, it is critical to understand the evolution of residual stress during WAAM process. In this study, a 3D thermo-mechanical coupling finite element model is established for thin-wall and cylinder-wall produced by WAAM. The evolution of the field of temperature, stress and strain in WAAMed parts were simulated. The influence of several parameters, including printing layer, printing path and interlayer temperature, on the evolution of stress and distortion were analyzed. A clear difference in the distribution of stress and distortion was found in these two parts. Longitudinal residual stress is close to the yield strength of the filler material for both thin-wall and cylinder wall. Current study could be used to assist process parameters selection. |