An atomistic modelling and statistical analysis study of crack-void interaction in Aluminum

S Chandra and MK Samal and NN Kumar and VM Chavan and S Raghunathan, PHILOSOPHICAL MAGAZINE LETTERS, 97, 504-514 (2017).

DOI: 10.1080/09500839.2018.1425006

The interaction between a brittle crack and pre-existing void in front of the crack tip was studied in the realm of molecular dynamics simulations at the nanoscale in face centred cubic Al within the framework of embedded-atom method. The results provide corroborative evidence of the fact that presence of a void in front of a running crack deters further crack growth. By performing an extensive series of simulations with different void sizes and crack-void distances coupled with statistical analysis, it has been found that (1) major role of voids is to decrease the fracture stress with increasing void size, in addition to slight increase in strain at which the crack growth occurs and the consequent strain to fracture, (2) fracture stress for a constant void size follows a sinusoidal distribution by varying the crack-void distance and (3) it is the void size that is most crucial in dictating the fracture properties of the material, rather than the void placement.

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