Crystal plasticity modeling of additively manufactured metallic microstructures

Different manufacturing processes such as flow forming, rolling, wire drawing and additive manufacturing induce anisotropic grain structure and texture evolution at the micro scale, which results in macroscopic anisotropic plastic behavior. Among these microstructures, development of columnar grain structure is quite common especially in additively manufactured metallic materials. A systematic micromechanical analysis is necessary to evaluate the influence of both grain morphology and texture (orientation alignment) on the mechanical response of the metallic alloys produced through such innovative techniques. In this context, the objective of the present study is to investigate qualitatively the influence of the columnar grain morphology and the orientation alignment observed in additively manufactured alloys through crystal plasticity finite element (CPFEM) simulations in representative volume elements (RVEs). Different RVEs are generated through Voronoi tessellation and subjected to uniaxial tensile loading in different directions. A detailed analysis is conducted to evaluate the influence of grain structure and orientation alignment on the plastic behavior of the material through homogenization for different microstructures.
2nd International Workshop on Plasticity, Damage and Fracture of Engineering Materials, IWPDF 2021


Polycrystalline plasticity modeling of anisotropic grain structures and statistical size effect in metallic alloys
Orhun, Bulut; Yalçınkaya, Tuncay; Department of Aerospace Engineering (2022-6-14)
In this thesis, two important microstructural phenomena affecting the plastic behavior of metallic materials are addressed through a local crystal plasticity modeling framework. Initially the influence of anisotropic grain structure developing during various forming procedures and additive manufacturing processes is studied following a multiscale modeling strategy, where Representative Volume Elements (RVEs) are analyzed under axial loading conditions. Macroscopic response of different degrees of anisotropi...
Plastic slip patterns through rate-independent and rate-dependent plasticity
Lancioni, Giovanni; Yalçınkaya, Tuncay (2014-05-09)
Plastic deformation induces various types of dislocation microstructures at different length scales, which eventually results in a heterogeneous deformation field in metallic materials. Development of such structures manifests themselves as macroscopic hardening/softening response and plastic anisotropy during strain path changes, which is often observed during forming processes. In this paper we present two different non-local plasticity models based on non-convex potentials to simulate the intrinsic rate-...
Intrinsic and Statistical Size Effects in Microforming
Yalçınkaya, Tuncay; Simonovski, Igor; ÖZDEMİR, İZZET (2017-04-28)
This paper analyzes the intrinsic (grain size dependent) and the statistical (grain number and orientation distribution dependent) size effects of micron level polycrystalline metallic specimens under plastic deformation through a strain gradient crystal plasticity framework. The macroscopic and local behavior of specimens from very limited number of grains to high number of grains are studied and the results are discussed in detail taking into account different boundary conditions.
Three Dimensional Grain Boundary Modeling in Polycrystalline Plasticity
Yalçınkaya, Tuncay; Firat, Ali Osman (2018-04-25)
At grain scale, polycrystalline materials develop heterogeneous plastic deformation fields, localizations and stress concentrations due to variation of grain orientations, geometries and defects. Development of inter-granular stresses due to misorientation are crucial for a range of grain boundary (GB) related failure mechanisms, such as stress corrosion cracking (SCC) and fatigue cracking. Local crystal plasticity finite element modelling of polycrystalline metals at micron scale results in stress jumps at...
Simulator of an additive and subtractive type of hybrid manufacturing system
Dilberoğlu, Mecid Uğur; Yaman, Ulaş; Dölen, Melik (2019-06-24)
Additive Manufacturing (AM) facilitates the production of intricate objects despite its weakness in attainable part quality and fabrication speed compared to the conventional manufacturing methods. To alleviate the problems arising as a natural outcome of AM methods, hybrid technologies become viable options by employing concurrent manufacturing procedures, e.g. synergetic additive and subtractive manufacturing (SM) actions. Hybrid workstations have recently opened up new dimensions to 3D-printing industry,...
Citation Formats
S. S. Acar, O. Bulut, and T. Yalçınkaya, “Crystal plasticity modeling of additively manufactured metallic microstructures,” Ankara, Türkiye, 2021, vol. 35, Accessed: 00, 2022. [Online]. Available: