Experimental Investigation and Modeling of the Dynamic Behavior of as-built SLM AlSi10Mg

AlSi10Mg alloy is a commonly used material in AM processes and there has been a great effort to investigate its microstructure, the influence of process parameters and post-treatments, and its quasi-static and fatigue response. However its mechanical behavior under extreme conditions has yet to be assessed. In this work, a thorough investigation of as-built SLM AlSi10Mg mechanical behavior and constitutive modeling are presented. Quasi-static and dynamic tests on smooth and round notched bars, and shear tests were performed and the influence of three different building orientation (0°, 45° and 90°) was considered. Dynamic Tensile Extrusion (DTE) and Taylor Cylinder Impact (TCI) tests, under different impact velocities, were used to probe the material response and fracture behavior under complex load paths, large plastic deformations, and high strain rates and temperatures. From the experimental data, an appropriate yield criterion, constitutive and damage models were selected and validated by the numerical simulation of both DTE and TCI tests.