@Article{icces.2021.08471,
AUTHOR = {Yun Teng, Zhendong Sha},
TITLE = {Symmetric Notches Cause Strengthening in Brittle Metallic glasses},
JOURNAL = {The International Conference on Computational \& Experimental Engineering and Sciences},
VOLUME = {23},
YEAR = {2021},
NUMBER = {1},
PAGES = {18--18},
URL = {http://www.techscience.com/icces/v23n1/42042},
ISSN = {1933-2815},
ABSTRACT = {For all engineering materials, the flaws are introduced inevitably from 
fabrication, mechanical damage, and corrosion. These stress raisers always 
induce catastrophic failures and it is therefore of great importance to understand
the effect of flaws on the mechanical properties of engineering materials. The 
effect of flaws on metallic glasses (MGs) is a debatable topic because many 
relevant works have reported notch strengthening, notch weakening and notch 
insensitivity for brittle MGs. The significant notch strengthening of MGs was 
attributed to the transition of failure mechanism, from catastrophic shear banding 
to ductile fracture. Here we investigate systematically the influence of notch 
geometry on mechanical behaviors of symmetrically notched MGs by molecular 
dynamics, including the notch depth, notch height and notch sharpness. Our 
work observes notch strengthening obviously in brittle MGs with a brittle failure 
through shear banding. This noteworthy notch strengthening is a consequence of
the constrained growth of the plastic zone. A transition from shear banding to 
homogeneous deformation within the un-notched ligament can be viewed by 
increasing the notch depth when the un-notched ligament width is under the 
threshold value, and also a stronger notch strengthening. Besides, the sharper 
notch enhances the fracture strength more apparently. Another important finding 
is the determined demand of notch configuration for observed notch 
strengthening. It is found that the notch strengthening behavior would be 
degraded by single-edge notch or asymmetric double-edge notches. Current 
results provide important insights into the deformation and failure modes of 
notched MGs, which may guide the design and engineers of MGs.},
DOI = {10.32604/icces.2021.08471}
}