Identification of a soft matrix-hard inclusion material by indentation

• Published in: International journal of mechanical sciences Vol. 235; p. 107723
• Main Authors: Tran, H.S., Bouffioux, C., Dedry, O., Rojas-Ulloa, C., Duchêne, L., Mertens, A., Habraken, A.M.
• Format: Journal Article Web Resource
• Language: English
• Published: Elsevier Ltd 01-12-2022; Elsevier BV
• Subjects: AlSi10Mg; Civil and Structural Engineering; Condensed Matter Physics; Engineering, computing & technology; Finite element simulation; General Materials Science; Ingénierie, informatique & technologie; Materials science & engineering; Mechanical Engineering; Mechanics of Materials; Metal matrix composites (MMC); Nano-indentation; Science des matériaux & ingénierie; Metal matrix composites (MMC); AlSi10Mg; Nano-indentation; Finite element simulation
• ISSN: 0020-7403; 1879-2162
• DOI: 10.1016/j.ijmecsci.2022.107723

•Identification of matrix and inclusion behaviors based on nano-indentation grids.•A new set of material parameters for the α-Al matrix.•Data validation by the scattering of Berkovich curves and a cube corner experiment.•Model of post-processed laser powder bed fusion microstructure.•Validation of an RVE model by the simulation of an experimental tensile test.
A new procedure for identifying the mechanical behavior of individual phases within a bi-material (matrix-particles) is presented. The case of AlSi10Mg (large globularized Si-rich particles surrounded by an α-Al phase) processed by additive manufacturing and post-treated is taken as a typical example. Grids of nano-indentation tests are performed at different locations on the nanocomposite using a Berkovich indenter and show an impact of the hard inclusions on the experimental curves. The elastoplastic properties of the matrix are identified based on the lowest load–indentation depth curves. Several representative finite element (FE) models demonstrate the influence of the particles on the nano-indentation response. The capacity of the FE model to predict the indentation curve of a cube corner indenter experiment and the Berkovich grid result scattering was checked. A representative volume element (RVE) based on a scanning electron microscope (SEM) image is defined. The identified material parameters of the α-Al phase and Si phase, it allows the prediction of the stress-strain curve of a macroscopic experimental tensile test.
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