ENHANCEMENTS TO THE INHERENT STRAIN METHOD FOR ADDITIVE MANUFACTURING ANALYSIS

摘要

Analysis of stress and deformation of parts produced during additive manufacturing (AM) process is critical to predict potential defects during the process and quality of parts produced. However, the complex physics of the process and vastly different scales of the analysis require long computations on powerful computers (including exa-scale computing), which makes accurate analysis impractical. Simplified approach in published literature typically utilizes extrapolation of inherent strain theory developed for analysis of welding processes, however, results are often unsatisfactory as the AM process and geometry of produced parts is much more complex. Here we present generalization of the inherent strain into a two-level method, where the fine model (so-called mesoscale analysis) provides a whole family of inherent strain models, and the coarse model (macroscale) uses different values for inherent strain varying with location, surrounding geometry, and parameters of AM process.