Crystal Plasticity Modeling and Experimental validation with an orientation distribution function for Ti-7 al alloy

Author(s): 
Pınar Acar, Ali Ramazani and Veera Sundararaghavan

CHALLENGE - The fundamental goal of this study is to identify the slip system parameters of Ti-Al alloys,
Ti-0Al and Ti-7Al, using crystal plasticity modeling with the ODF approach.

SOLUTION - For this study, a NSGA-II optimization algorithm is implemented with a global sampling method in modeFRONTIER to calibrate the computational model according to the available experimental data. The optimization problem is defined similarly for both alloys, and the objective functions are determined to minimize the L2 norm errors between the true stress - true strain curves of the experimental data and ODF simulation for both tension and compression tests.

BENEFITS - The optimum results provide an accurate computational representation in comparison with the experimental data. Additional experimental data, which illustrates the microstructural texture at 9% and 20% strains in compression test, is used as an another metric for verification of the optimum design.

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