W ilmer Velilla-Díaz

Universidad Austral de Chile, Valdivia, Chile

Dr. Velilla-Díaz is a researcher and assistant professor at the Universidad Austral de Chile in Valdivia.


Grain boundaries (GBs) are relevant as structural barriers for deformations in nano-crystalline materials and their resistance against fatigue crack propagation. The overall behavior of the material’s microstructure is the result of a complex interaction of multiple grains with a variety of relative orientations and their mechanical response in the presence of small defects. The effect of the grain boundaries on the crack propagation constitutes an important factor to determine the mechanical behavior of nano-materials under static and dynamic loads. The purpose of this study is to analyze the effect of relative tilt and twist angles on the crack propagation of single edge cracked bi-crystlas of a FCC microstructure. In this research, molecular dynamics simulations at room temperature under increasing cyclic loads are performed to characterize the effect of different grain miss-orientations on the crack propagation. The results show that high twist angles have a greater effect on the resistance to crack propagation.


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