Part 2

Part two: Bridging mobility from molecular dynamics to dislocation dynamics

The data and DDinput files provided represent a simulation box of size 2000bx2000bx10000b along the x-, y-, and z-direction, respectively, and containing an initial dislocation structure consisting of 12 Frank Read sources distributed randomly on all slip systems. Start with these files and run MDDP in order to establish the reference behavior of the sample in the form of the stress strain curve when loaded in uniaxial tension along the z-direction. The same postprocessing procedure described in Part One is used. The mobility law used in the code is linear and the reference mobility (as can be seen in the data file) is 10.e2 (pa.s)^-1. The stress-strain curve should look like the figure 1.

Fig. 1. Stress-strain curve, bridging mobility from molecular dynamics to dislocation dynamics.

Study the effect of mobility on the calculated stress strain curve. Redo the same problem above for a lower and higher values of mobility, of 1.e2 and 100e2 (pa.s)^-1 and obtain the corresponding stress strain curve. Compare the different aspects of the behavior (yield point and following hardening behavior).

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