Joanna Szyndler

Cellular Automata Finite Element Approach for Modelling Microstructure Evolution under Thermo-Mechanical Processing Conditions

The concurrent cellular automata finite element (CAFE) approach for modelling microstructure evolution under thermo-mechanical processing conditions is the subject of the present work. Particular attention is put on modelling two phenomena, static recrystallization after deformation and phase transformation during heating. Details of the developed models are presented within the paper. Both models are implemented based on the CA Framework, which is also described in the work. Finally cellular automata approaches are combined with the finite element model based on the digital material representation idea. The numerical modelling of complex multistage hot deformation process was selected as a case study to show capabilities of the developed cellular automata finite element model.

Development of the Modified Cellular Automata Sphere Growth Model for Creation of the Digital Material Representations

Development of reliable algorithm for generation of statistical representations of microstructure morphologies is the subject of the present work. The implemented cellular automata sphere growth model is presented first. Obtained grain size distribution of digital microstructure is compared with experimental measurements to prove efficiency of the proposed algorithm. Then, the grain growth model was additionally combined with the genetic algorithm optimization to extend its microstructure generation capabilities. Finally, possibilities of practical applications of generated digital material representation for modelling texture evolution during channel die test is presented.

Numerical and Experimental Investigation of the Innovatory Incremental-Forming Process Dedicated to the Aerospace Industry

The main goal of this work is development of the incremental-forming (IF) process for manufacturing integral elements applicable to the aerospace industry. A description of the proposed incremental-forming concept based on division of large die into a series of small anvils pressed into the material by a moving roll is presented within this article. A unique laboratory device has been developed to investigate the effects of process parameters on the material flow and the press loads. Additionally, a developed numerical model of this process with specific boundary conditions is also presented and validated to prove its predictive capabilities. However, main attention is placed on development of the process window. Thus, detailed investigation of the process parameters that can influence material behavior during plastic deformation, namely, roll size and roll frequency, is presented. Proper understanding of the material flow to improve the IF process, as well as press prototype, and to increase its technological readiness is the goal of this article. Results in the form of, e.g., strain distribution or recorded forging loads are presented and discussed.

Numerical and experimental microscale analysis of the incremental forming process

Development of the 2D concurrent multiscale numerical model of novel incremental forming (IF) process is the main aim of the paper. The IF process is used to obtain light and durable integral parts, especially useful in aerospace or automotive industries. Particular attention in the present work is put on numerical investigation of material behavior at both, macro and micro scale levels. A Finite Element Method (FEM) supported by Digital Material Representation (DMR) concept is used during the investigation. Also, the Crystal Plasticity (CP) theory is applied to describe material flow at the grain level. Examples of obtained results both from the macro and micro scales are presented in the form of strain distributions, grain shapes and pole figures at different process stages. Moreover, Electron Backscatter Diffraction (EBSD) analysis is used to obtain detailed information regarding material morphology changes during the incremental forming for the comparison purposes.

Evaluation of Local Material Flow during Complex Deformation Conditions on the Basis of Multi Scale Analysis

Development of the multiscale numerical model of innovative incremental forming process, dedicated for manufacturing complex components for the aerospace industry is the main aim of the work. Description of the incremental forming concept based on division of large die into a series of small anvils subsequently pressed into the material is presented within the paper. Particular attention is put on material behavior at both, macro and micro scale levels, respectively. A Finite Element Method (FEM) supported by Digital Material Representation (DMR) concept was used during the investigation. Results in the form of strain distributions and shapes of grains obtained from different sample areas after incremental forming process are presented within the paper.