期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141362
关键词
Deformation process; Finite element analysis; Additive manufacturing; Lattice structures; Microtomography
类别
资金
- Bialystok University of Technology [UMO-2016/23/N/ST8/03519]
- National Science Centre (Poland)
This work focuses on numerically modeling the deformation process and mechanical properties of structures obtained by LPBF, using geometric models and CT/micro-CT to map realistic shapes. The study investigates the relationship between shape accuracy and mechanical properties, as well as identifies fracture initiation locations in titanium cellular structures, with results verified by experimental tests.
This work concerns the numerical modeling of the deformation process and mechanical properties of structures obtained by the additive method laser power bed fusion (LPBF). The investigation uses diamond structures of Ti-6Al-4V titanium implantation alloy with various relative densities. To model the process of tensile deformation of the materials, geometric models were used, mapping the realistic shape of the examined structures. To recreate the geometry of the samples, computed tomography (CT) and microtomography (micro-CT) were used, which allowed to obtain two accuracy levels of the mapping details of the investigated structures shape. Taking into account the nonlinearity of the material in the computational model makes it possible to model the deformation process of cellular materials until the fracture initiation. On the basis of the performed calculations using the finite element method (FEM), the stress and strain distributions in deformed structures were obtained and analyzed. The relationship between the shape of cellular structures and their effective mechanical properties on a macroscopic scale was investigated. The influence of the accuracy of the structures shape mapping on their strength properties and stress and strain distributions was also described. On the basis of the conducted research, fracture initiation localizations in titanium cellular structures were indicated. Finally, the results of the numerical calculations were verified by experimental tests.
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