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Nuwan Dewapriya's blog

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Modelling fracture of graphene using Griffith’s criterion and quantized fracture mechanics

In armchair graphene sheets, crack propagates perpendicular to the applied strain, whereas crack propagation in zigzag sheets occurs at an angle to the straining direction. This occurs due to different bond structure along armchair and zigzag directions as shown in Fig. 1. Videos 1 and 2 show the fracture of armchair and zigzag sheets, respectively.


Fig. 1: Armchair and zigzag directions of graohene

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Visualizing LAMMPS molecular dynamics trajectories using visual molecular dynamics (VMD)

It is very important to visualize molecular dynamics (MD) trajectories since there are many aspects of MD simulations which are difficult to identify without a proper visualization tool. Improper bounday condition in MD is one of such examples. I use Visual Molecular Dynamics (VMD) to visualize my MD simulations. Some of my movies, created using VMD, are shown below.

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Running MD simulations with LAMMPS

In appendix A of PhD thesis (, I share a MATLAB code to get coordinates of carbon atoms in a graphene sheet. The code also generates the data file required for LAMMPS. In the Appendix, I included a sample input and the corresponding output files from LAMMPS. I hope this will be useful for those who would like to learn MD simulations.

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